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Articoli di riviste sul tema "Contour"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Liu, Hao, Hongbo Qian, Ning Dai, and Jianning Zhao. "Heuristic Initialization for Active Contour Models in CT/MRI Image Processing." International Journal of Image and Graphics 15, no. 03 (2015): 1550010. http://dx.doi.org/10.1142/s0219467815500102.

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It is an important segmentation approach of CT/MRI images to automatically extract contours in every slice using active contour models. The key point of the segmentation approach is to automatically construct initial contours for active contour models because any active contour model is sensitive to its initial contour. This paper presents an algorithm to construct such initial contours using a heuristic method. Assume that the contour in previous slice (previous contour) is accurate. The contour in the current slice (current contour) is constructed according to the previous contour using the

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2

Xiao, Xiao, Yuhang Liu, and Yanci Zhang. "Iterative Low-Poly Building Model Reconstruction from Mesh Soups Based on Contour." Remote Sensing 16, no. 4 (2024): 695. http://dx.doi.org/10.3390/rs16040695.

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Existing contour-based building-reconstruction methods face the challenge of producing low-poly results. In this study, we introduce a novel iterative contour-based method to reconstruct low-poly meshes with only essential details from mesh soups. Our method focuses on two primary targets that determine the quality of the results: reduce the total number of contours, and generate compact surfaces between contours. Specifically, we implemented an iterative pipeline to gradually extract vital contours by loss and topological variance, and potential redundant contours will be removed in a post-pr

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3

Ramli, Izzad, Nursuriati Jamil, and Noraini Seman. "An Iterated Two-Step Sinusoidal Pitch Contour Formulation for Expressive Speech Synthesis." Journal of Information and Communication Technology 20, No.4 (2021): 489–510. http://dx.doi.org/10.32890/jict2021.20.4.2.

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Intonation generation in expressive speech such as storytelling is essential to produce high quality Malay language expressive speech synthesizer. Intonation generation, for instance explicit control, has shown good performance in terms of intelligibility with reasonably natural speech; thus, it was selected in this research. This approach modifies the prosodic features, such as pitch contour, intensity, and duration, to generate the intonation. However, modification of pitch contour remains a problem because the desired pitch contour is not achieved. This paper formulated an improved pitch co

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4

Peng, Yan Jun, and Shuai Zhang. "A Novel Approach for Active Contour Initialization in 3D Medical Image Segmentation." Applied Mechanics and Materials 239-240 (December 2012): 1004–10. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.1004.

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Contour initialization is a big problem of the active contour model. Using the continuous features of the three-dimensional medical image, this paper proposes an initial contour prediction model. There are some changes in the boundary contours of the same object. We attribute these changes to continuous translation and similar deformation, and quantify into the centroid displacement and displacement of the point in the direction of Normal. The curve fitting method is used to predict the centroid displacement and the displacement of the points of the contours, which can provide more accurate pr

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5

Li, Wu, and Charles D. Gilbert. "Global Contour Saliency and Local Colinear Interactions." Journal of Neurophysiology 88, no. 5 (2002): 2846–56. http://dx.doi.org/10.1152/jn.00289.2002.

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Our visual system can link components of contours and segregate contours from complex backgrounds based on geometric grouping rules. This is an important intermediate step in object recognition. The substrate for contour integration may be based on contextual interactions and intrinsic horizontal connections seen in primary visual cortex (V1). We examined the perceptual rules governing contour saliency to determine whether the spatial extents of contextual interactions and horizontal connections match those mediating saliency. To quantify these rules, we used stimuli composed of randomly orien

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6

Schmuckler, Mark A. "Testing Models of Melodic Contour Similarity." Music Perception 16, no. 3 (1999): 295–326. http://dx.doi.org/10.2307/40285795.

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In two experiments, descriptions of melodic contour structure and predictions of perceived similarity relations between pairs of contours produced by a number of different models are examined. Two of these models, based on the music- theoretic approaches of Friedmann (1985) and Marvin and Laprade (1987), characterize contours in terms of interval content or contour subset information. The remaining two approaches quantify the global shape of the contours, through the presence of cyclical information (assessed via Fourier analysis) and the amount of oscillation (e. g., reversals in direction, p

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7

LIU, HAO, GUANHUA ZHU, JIANNING ZHAO, HONGBO QIAN, and NING DAI. "RECOGNITION OF OCCLUSIONS IN CT IMAGES USING A CURVE-BASED PARAMETERIZATION METHOD." International Journal of Image and Graphics 13, no. 04 (2013): 1350018. http://dx.doi.org/10.1142/s0219467813500186.

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It is an important way for segmentations of CT images to extract contours of objects slice-by-slice. For such a way, an important idea is analogy. That is to say, correct the contour in current slice (current contour) according to the contour in previous slice (previous contour). The key to properly correct the current contour is the ability to recognize occlusions (or say leaking parts) in the current contour. We present a curve-based curve parameterization method to recognize occlusions. The previous contour is evolved to the current contour using line projections. In the process of evolutio

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8

Yang, Shudi, Jiaxiong Wu, and Zhipeng Feng. "Dual-Fusion Active Contour Model with Semantic Information for Saliency Target Extraction of Underwater Images." Applied Sciences 12, no. 5 (2022): 2515. http://dx.doi.org/10.3390/app12052515.

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Underwater vision research is the foundation of marine-related disciplines. The target contour extraction is significant for target tracking and visual information mining. Aiming to resolve the problem that conventional active contour models cannot effectively extract the contours of salient targets in underwater images, we propose a dual-fusion active contour model with semantic information. First, the saliency images are introduced as semantic information and salient target contours are extracted by fusing Chan–Vese and local binary fitting models. Then, the original underwater images are us

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9

Wang, Ying, Zhi Xian Lin, Jian Guo Cao, and Mao Qing Li. "Automatic MRI Brain Tumor Segmentation System Based on Localizing Active Contour Models." Advanced Materials Research 219-220 (March 2011): 1342–46. http://dx.doi.org/10.4028/www.scientific.net/amr.219-220.1342.

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In this paper, an automatic segmentation system was developed for MRI brain tumor. Local region-based active contour models were suitable for heterogeneous features of brain MRI image. But the models are sensitive to initial contour, which generally requires manual setting. An automatic MRI brain tumor segmentation system were developed based on localized contour models, which can identify tumor-dominant slice, set initial contour automatically and segment tumor’s contours from all MRI slices autonomously. K-means clustering and grayscale analysis were combined to identify tumor-dominant slice

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10

GEISLER, WILSON S., and JEFFREY S. PERRY. "Contour statistics in natural images: Grouping across occlusions." Visual Neuroscience 26, no. 1 (2009): 109–21. http://dx.doi.org/10.1017/s0952523808080875.

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AbstractCorrectly interpreting a natural image requires dealing properly with the effects of occlusion, and hence, contour grouping across occlusions is a major component of many natural visual tasks. To better understand the mechanisms of contour grouping across occlusions, we (a) measured the pair-wise statistics of edge elements from contours in natural images, as a function of edge element geometry and contrast polarity, (b) derived the ideal Bayesian observer for a contour occlusion task where the stimuli were extracted directly from natural images, and then (c) measured human performance

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11

MUKHERJEE, DIPTI PRASAD, and NILANJAN RAY. "CONTOUR INTERPOLATION USING LEVEL-SET ANALYSIS." International Journal of Image and Graphics 12, no. 01 (2012): 1250004. http://dx.doi.org/10.1142/s0219467812500040.

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We propose a novel approach to generate intermediate contours given a sequence of object contours. The proposal unifies shape features through contour curvature analysis and motion between the contours through optic flow analysis. The major contribution of this work is in integrating this shape and image intensity-based contour interpolation scheme in a level-set framework. The interpolated contours between an initial and a target contour act as missing link and establish a path along which contour deformation has taken place. We have shown that for different application domains such as 3D org

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12

Machilsen, B., M. Demeyer, and J. Wagemans. "Peripheral contour integration favors convex contours." Journal of Vision 13, no. 9 (2013): 725. http://dx.doi.org/10.1167/13.9.725.

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13

Wang, Bei, and Jin Guo He. "Contour Reconstruction Based on Non-Closed Contours." Applied Mechanics and Materials 220-223 (November 2012): 2313–18. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.2313.

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There are a lot of developments focused on 3D surface reconstruction based on 2D contours in recent decades, mostly based on closed contours. Due to the limitation of imperfect technology on material classification and edge extraction, it’s difficult to extract closed contours automatically, and this situation limits the application of 3D surface reconstruction based on contour. This paper designs a reconstruction algorithm based on non-closed contour, which not only provides a new viewpoint for research on 3D reconstruction, but also make 3D reconstruction based on contour more applicable.

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14

Humphreys, Glyn W., and Andrew Olson. "Separating effects of orthographic similarity and contour summation in the identification of masked letter strings." Quarterly Journal of Experimental Psychology Section A 54, no. 4 (2001): 1203–19. http://dx.doi.org/10.1080/713756017.

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We separated effects of contour summation and orthographic similarity under masking conditions, by comparing identification with simultaneous and sequentially presented letter strings, which either did or did not overlap spatially. With overlapping simultaneous stimuli, performance was better for strings with similar contours than for strings with the same letters (the orthographic similarity condition). This suggests that contour summation effects were strongest in the condition where stimuli had similar contours. With sequential presentations, performance in the similar contour and the ortho

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15

Zheng, Yi, Ling Zhang, Eric Guilbert, and Yi Long. "An improved spatial contour tree constructed method." Proceedings of the ICA 1 (May 16, 2018): 1–6. http://dx.doi.org/10.5194/ica-proc-1-128-2018.

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Contours are important data to delineate the landform on a map. A contour tree provides an object-oriented description of landforms and can be used to enrich the topological information. The traditional contour tree is used to store topological relationships between contours in a hierarchical structure and allows for the identification of eminences and depressions as sets of nested contours. This research proposes an improved contour tree so-called spatial contour tree that contains not only the topological but also the geometric information. It can be regarded as a terrain skeleton in 3-dimen

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16

Kim, Jehyeok, Junyoung Moon, Jaewook Ryu, and Giuk Lee. "Bioinspired Divide-and-Conquer Design Methodology for a Multifunctional Contour of a Curved Lever." Applied Sciences 11, no. 13 (2021): 6015. http://dx.doi.org/10.3390/app11136015.

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In this study, we propose a bioinspired design methodology for a multifunctional lever based on the morphological principle of the lever mechanism in the Salvia pratensis flower. The proposed divide-and-conquer contour design methodology does not treat a lever contour as a single curve that satisfies multiple functions. Rather, the lever contour combines partial contours to achieve its assigned subfunction. This approach can simplify the complex multifunctional problem in lever design. We include a case study of a lever utilized in a compact variable gravity compensator (CVGC) to explain the m

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17

Garrigan, Patrick. "The Effect of Contour Closure on Shape Recognition." Perception 41, no. 2 (2012): 221–35. http://dx.doi.org/10.1068/p7145.

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Recent research on the Gestalt principle of closure has focused on how the presence of closure affects the ability to detect contours hidden in cluttered visual arrays. Some of the earliest research on closure, however, dealt with encoding and recognizing closed and open shapes, rather than detection. This research re-addresses the relation between closure and shape memory, focusing on how contour closure affects the ability to learn to recognize novel contour shapes. Of particular interest is whether closed contour shapes are easier to learn to recognize and, if so, whether this benefit is du

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18

Liu, Guang Shuai, and Bai Lin Li. "Auto-Identification of Symmetrical Contours on ICT Image in Reverse Engineering." Applied Mechanics and Materials 401-403 (September 2013): 1341–46. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.1341.

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Through considering the symmetry constraint characteristics in mechanical product contours, an auto-identification method of two-dimensional symmetrical contour based on feature matching is presented in this paper. Firstly, the feature points are extracted based on contour cloud point data partition and by using offset method, the different distribution rules of axis-symmetrical and rotation-symmetrical images for judging the type of symmetry was studied. The feature description parameters of symmetrical contour were calculated by adopting rotational inertia method and periodic method, which i

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19

Taniyasu, Kanta, Ryutaro Tanaka, Isaí Espinoza Torres, Israel Martínez Ramírez, Katsuhiko Sekiya, and Keiji Yamada. "Improvement of Prediction Reliability of Tool Edge Contour Position in Turning ― Influence of Boundary Wear on Process of Dividing Roughness Curve into Feed Marks in Estimating Roughness Components." Defect and Diffusion Forum 441 (March 26, 2025): 75–81. https://doi.org/10.4028/p-4pk9w7.

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It is well known that the surface roughness in turning consists of the theoretical roughness, vibration in the depth of cut direction, and overcutting by adhered work material. Some of authors had already proposed the method to calculate surface roughness components. In this method, the approximate arc was used as a representative tool contour of the tool contour to dividing roughness curve into each feed marks. The arc was defined by the height of the intersection of the measured tool contours set at feed intervals horizontally. However, when the boundary wear occurred in the finished surface

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20

Fang, Li Yong, Hui Li, and Jin Ping Bai. "Defect Contour Matching Based on Similarity Measure for 3D Reconstruction." Advanced Materials Research 308-310 (August 2011): 1656–61. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.1656.

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Contour matching is one of the important problems concerned in 3-D reconstruction field. According to the difficulties of defect contour matching in defect modeling, a method based on similarity measure is presented in this paper. In this method, the theory of similarity measure is introduced to quantitatively describe the similarity of two contours. And the value of similarity measure is set as the criterion to judge matching relation between two contours in consecutive slices. For reducing computational complexity and improving accuracy of contours matching, a candidate matching field of con

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21

Göbel, Alexander. "Additives pitching in: L*+H signals ordered Focus alternatives." Semantics and Linguistic Theory 29 (December 9, 2019): 279. http://dx.doi.org/10.3765/salt.v29i0.4612.

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Approaches to the meaning of intonational meaning differ in associatingeach subcomponent with a meaning that remains invariant across contours (e.g.Pierrehumbert & Hirschberg 1990) or treating a contour as contributing its meaningholistically (e.g. Goodhue et al. 2015). This paper argues for a common core ofthe L*+H pitch accent across two intonation contours, the Rise-Fall-Rise (RFR,e.g. Ward & Hirschberg 1985), and a novel contour coined the Downscale-Contour(DSC). Both contours are analyzed as indicating the presence of an alternative withrespect to a scale derived from the QUD, but

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22

Zhu, Shufeng, Lena L. N. Wong, Bin Wang, and Fei Chen. "Assessing the Importance of Lexical Tone Contour to Sentence Perception in Mandarin-Speaking Children With Normal Hearing." Journal of Speech, Language, and Hearing Research 60, no. 7 (2017): 2116–23. http://dx.doi.org/10.1044/2017_jslhr-h-16-0272.

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Purpose The aim of the present study was to evaluate the influence of lexical tone contour and age on sentence perception in quiet and in noise conditions in Mandarin-speaking children ages 7 to 11 years with normal hearing. Method Test materials were synthesized Mandarin sentences, each word with a manipulated lexical contour, that is, normal contour, flat contour, or a tone contour randomly selected from the four Mandarin lexical tone contours. A convenience sample of 75 Mandarin-speaking participants with normal hearing, ages 7, 9, and 11 years (25 participants in each age group), was selec

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Moldabayev, S., A. Adamchuk, G. Assylkhanova, N. Bakytzhanov, A. Khairullayev, and M. Yeluzakh. "Determining the limiting contour of the quarry based on minimizing the volume of the near-contour ore zone." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 2 (April 30, 2025): 51–59. https://doi.org/10.33271/nvngu/2025-2/051.

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Purpose. To develop a new method for determining the volumetric current and final quarry contours based on minimizing the volume of the near-contour ore zone at different stages of mining development. Methodology. An economic-mathematical model was constructed to determine the optimal horizon for the introduction of combined transport, considering the quarry parameters. The proposed algorithm allows for the identification of the horizon for the installation of a combined transport transshipment point. Findings. The experience of designing the ultimate contour of deep quarries in open-pit minin

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Shalaby, Abouzeid M. "Isomorphic Hilbert spaces associated with different complex contours of the $\mathcal{PT}$-symmetric (-x4) theory." International Journal of Modern Physics A 29, no. 11n12 (2014): 1450059. http://dx.doi.org/10.1142/s0217751x14500596.

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In this work, we stress the existence of isomorphisms which map complex contours from the upper half to contours in the lower half of the complex plane. The metric operator is found to depend on the chosen contour but the maps connecting different contours are norm-preserving. To elucidate these features, we parametrized the contour [Formula: see text] considered in Phys. Rev. D 73, 085002 (2006) for the study of wrong sign x4 theory. For the parametrized contour of the form [Formula: see text], we found that there exists an equivalent Hermitian Hamiltonian provided that a2c is taken to be rea

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25

Poom, Leo. "Visual Inter-Attribute Contour Completion." Perception 30, no. 7 (2001): 855–65. http://dx.doi.org/10.1068/p3222.

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A new visual phenomenon, inter-attribute illusory (completed) contours, is demonstrated. Contour completions are perceived between any combination of spatially separate pairs of inducing elements (Kanizsa-like ‘pacman’ figures) defined either by pictorial cues (luminance contrast or offset gratings), temporal contrast (motion, second-order-motion or ‘phantom’ contours), or binocular-disparity contrast. In a first experiment, observers reported the perceived occurrence of contour completion for all pair combinations of inducing elements. In a second experiment they rated the perceived clarity o

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Zhang, Li Guo, Mei Jin, Ju Jin, and Guo Hui Yu. "Research of ASM Object Tracking Method Combining Kalman Estimation." Advanced Materials Research 1049-1050 (October 2014): 1595–98. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.1595.

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ASM is a statistical model applied to match contours of non-rigid object. The actual contour may much different from the initial contour and the result is likely to converge to an error contour. Kalman filter is adopted to track the current frame for the prediction and acts as the initial state of the ASM, and then applies the ASM to correct the contour of the object. Experimental results show that the method proposed in this paper allows the model to converge to the target contour quickly and accurately. It has good stability and robustness.

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Wang, Jingxue, Dongdong Zang, Jinzheng Yu, and Xiao Xie. "Extraction of Building Roof Contours from Airborne LiDAR Point Clouds Based on Multidirectional Bands." Remote Sensing 16, no. 1 (2024): 190. http://dx.doi.org/10.3390/rs16010190.

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Because of the complex structure and different shapes of building contours, the uneven density distribution of airborne LiDAR point clouds, and occlusion, existing building contour extraction algorithms are subject to such problems as poor robustness, difficulty with setting parameters, and low extraction efficiency. To solve these problems, a building contour extraction algorithm based on multidirectional bands was proposed in this study. Firstly, the point clouds were divided into bands with the same width in one direction, the points within each band were vertically projected on the central

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Greene, Ernest, and Marja Verloop. "Anomalous and Luminance Contours Produce Similar Angular Induction Effects." Perception 23, no. 2 (1994): 147–56. http://dx.doi.org/10.1068/p230147.

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One can shear a pattern of lines to produce an anomalous contour which has a perceptual influence similar to that of a straight line segment. Illusion effects have been found with configurations which contain these anomalous contours, as well as cross adaptation with respect to luminance contours. We have found that sheared-line contours will bias judgment of collinearity, ie perceived alignment, of a luminance contour. The angular induction effects are similar to those reported for interactions between luminance contours, and the same equation can be used to model both kinds of data. The resu

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Xi, Chuan Li, Xiao Rong Chen, and Yuan Cong. "Halcon-Based Optical Fiber Geometry Parameters Measurement Algorithm." Advanced Materials Research 805-806 (September 2013): 1929–32. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.1929.

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This paper presents an algorithm to measure geometric parameters of optical fibers based on Halcon. The algorithm enhances the contrast of the fiber image and uses canny edge detection operator to extract the contours of fiber cross section. In order to remove noise in the contour, this paper studies new methods, include setting the contour length range, whether each contour is circular or not and whether the center of the circular contour and the center of the fiber core is consistent or not. These methods remove most of the noise. Finally, the effective contours are merged and then approxima

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Tatashev, Alexander G., and Marina V. Yashina. "Spectrum of continuous two-contours system." ITM Web of Conferences 24 (2019): 01014. http://dx.doi.org/10.1051/itmconf/20192401014.

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A deterministic continuous dynamical system is considered. This system contains two contours. The length of theith contour equalsci,i= 1, 2. There is a moving segment (cluster) on each contour. The length of the cluster, located on theith contour, equalsli,i= 1, 2. If a cluster moves without delays, then the velocity of the cluster is equal to 1. There is a common point (node) of the contours. Clusters cannot cross the node simultaneously, and therefore delays of clusters occur. A set of repeating system states is called a spectral cycle. Spectral cycles and values of average velocities of clu

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Wallentinsen, Kristen. "Fuzzy Family Ties." Journal of Music Theory 66, no. 1 (2022): 93–128. http://dx.doi.org/10.1215/00222909-9534151.

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Abstract Melodic contour is one of a melody's defining characteristics. Music theorists such as Michael Friedmann, Robert Morris, Elizabeth West Marvin and Paul Laprade, and Ian Quinn have developed models for evaluating similarities between contours, but only a few compare similarities between pairs of contours with different lengths, and fewer still can measure shared characteristics among an entire family of contours. This article introduces a new method for evaluating familial similarities between related contours, even if the contours have different cardinalities. The model extends theori

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Faghih, Behnam, and Joseph Timoney. "Smart-Median: A New Real-Time Algorithm for Smoothing Singing Pitch Contours." Applied Sciences 12, no. 14 (2022): 7026. http://dx.doi.org/10.3390/app12147026.

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Pitch detection is usually one of the fundamental steps in audio signal processing. However, it is common for pitch detectors to estimate a portion of the fundamental frequencies incorrectly, especially in real-time environments and when applied to singing. Therefore, the estimated pitch contour usually has errors. To remove these errors, a contour smoother algorithm should be employed. However, because none of the current contour-smoother algorithms has been explicitly designed to be applied to contours generated from singing, they are often unsuitable for this purpose. Therefore, this articl

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Al-Tamimi, Mohammed Sabbih Hamoud. "Hybrid Methodology for Image Segmentation Based on Active Contour Module and Alpha-Shape Theory." Modern Applied Science 10, no. 11 (2016): 30. http://dx.doi.org/10.5539/mas.v10n11p30.

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The concept of the active contour model has been extensively utilized in the segmentation and analysis of images. This technology has been effectively employed in identifying the contours in object recognition, computer graphics and vision, biomedical processing of images that is normal images or medical images such as Magnetic Resonance Images (MRI), X-rays, plus Ultrasound imaging. Three colleagues, Kass, Witkin and Terzopoulos developed this energy, lessening “Active Contour Models” (equally identified as Snake) back in 1987. Being curved in nature, snakes are characterized in an image fiel

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Liu, Guang Shuai, and Bai Lin Li. "Extraction of Optimal Contour Dominant Points Based on ICT Images in Reverse Engineering." Applied Mechanics and Materials 423-426 (September 2013): 2570–75. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.2570.

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How to effectively extract contour dominant points is one of key problems in process of industrial CT image, second extraction method was put forward. Second extraction method included two steps: rough extraction and accurate extraction. Firstly, discrete circular curvatures of contour points are calculated. Secondly, through rough extraction step, bad points and points which arent correlated with contour features were removed. At last, through accurate extraction step, contour dominant points were extracted by levels of detail. Experimental results show that contour dominant points can descri

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Zhang, Ju, Zijia Lu, Yongsheng Wang, and Xuejun Bai. "The Aesthetic Developmental Characteristics of Contour Features in Children and Adolescents with High- and Low-Level Visual Aesthetic Sensitivity across Grade Levels." Behavioral Sciences 14, no. 5 (2024): 416. http://dx.doi.org/10.3390/bs14050416.

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This study examined the aesthetic developmental characteristics of contour features (curved and sharp corners) among children and adolescents with different levels (high and low) of visual aesthetic sensitivity in three grades (4, 6, and 8). The results revealed that (1) there was a significant main effect of contour features, with children and adolescents liking curved contours and perceiving them as more beautiful than sharp-angled contours; (2) there was a significant interaction with contour features in grades 6 and 4, and there was no significant difference in liking curved contours and p

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Yang, Yuhan, Shoujun Zhou, Peng Shang, En Qi, Shibin Wu, and Yaoqin Xie. "Contour Propagation Using Feature-Based Deformable Registration for Lung Cancer." BioMed Research International 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/701514.

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Accurate target delineation of CT image is a critical step in radiotherapy treatment planning. This paper describes a novel strategy for automatic contour propagation, based on deformable registration, for CT images of lung cancer. The proposed strategy starts with a manual-delineated contour in one slice of a 3D CT image. By means of feature-based deformable registration, the initial contour in other slices of the image can be propagated automatically, and then refined by active contour approach. Three algorithms are employed in the strategy: the Speeded-Up Robust Features (SURF), Thin-Plate

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Kumar, Pankaj, Paul Lewis, and Tim McCarthy. "The Potential of Active Contour Models in Extracting Road Edges from Mobile Laser Scanning Data." Infrastructures 2, no. 3 (2017): 16. https://doi.org/10.3390/infrastructures2030009.

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Active contour models present a robust segmentation approach, which makes efficient use of specific information about objects in the input data rather than processing all of the data. They have been widely-used in many applications, including image segmentation, object boundary localisation, motion tracking, shape modelling, stereo matching and object reconstruction. In this paper, we investigate the potential of active contour models in extracting road edges from Mobile Laser Scanning (MLS) data. The categorisation of active contours based on their mathematical representation and implementati

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38

Shipley, Thomas F., and Philip J. Kellman. "Boundary Completion in Illusory Contours: Interpolation or Extrapolation?" Perception 32, no. 8 (2003): 985–99. http://dx.doi.org/10.1068/p3420.

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Most computational and neural-style models of contour completion (ie illusory and occluded contours) are based on interpolation: the filling in of an edge between two visible edges. The results of three experiments suggest an alternative conception, that units are formed as a result of extrapolation from visible edges. In three experiments, subjects reported illusory contours between standard illusory-contour inducing elements and forms that do not, by themselves, induce illusory contours. We suggest that these forms are not a special case of inducing elements but that they represent a differe

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Anderson, Barton L. "A Theory of Illusory Lightness and Transparency in Monocular and Binocular Images: The Role of Contour Junctions." Perception 26, no. 4 (1997): 419–53. http://dx.doi.org/10.1068/p260419.

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A theory of illusory transparency and lightness is described for monocular and binocular images containing X-, T- and I-contour junctions. This theory asserts that the geometric and luminance relationships of contour junctions induce illusory transparency and lightness percepts by causing a phenomenal scission of a homogenous luminance into multiple contributions. Specifically, it is argued that a discontinuous change in contrast along aligned contours that preserve contrast polarity induces a scission of the lower contrast region into a near-transparent surface or an illumination change, and

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40

Zhang, Tao, Yibo Ai, and Weidong Zhang. "Hierarchical Tensor Decomposition of Module Partition for the Mechanical Simulation." Applied Sciences 13, no. 4 (2023): 2684. http://dx.doi.org/10.3390/app13042684.

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Abstract (sommario):

The mechanical simulation experiment can provide guidelines for the structural design of materials, but the module partition of mechanical simulation experiments is still in its infancy. A mechanical simulation contour, e.g., strain and stress contour, has hierarchical characteristics. By analyzing the contour at different layers, the physical properties of the structure material can be improved. Current state-of-the-art methods cannot distinguish between simulation strain contours, as well as sparsely distributed spots of strain (stress concentrations) from simulation strain contour images, r

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Yang, Shuzhen, Jingmin Zhang, and Jin Yuan. "A High-Accuracy Contour Segmentation and Reconstruction of a Dense Cluster of Mushrooms Based on Improved SOLOv2." Agriculture 14, no. 9 (2024): 1646. http://dx.doi.org/10.3390/agriculture14091646.

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This study addresses challenges related to imprecise edge segmentation and low center point accuracy, particularly when mushrooms are heavily occluded or deformed within dense clusters. A high-precision mushroom contour segmentation algorithm is proposed that builds upon the improved SOLOv2, along with a contour reconstruction method using instance segmentation masks. The enhanced segmentation algorithm, PR-SOLOv2, incorporates the PointRend module during the up-sampling stage, introducing fine features and enhancing segmentation details. This addresses the difficulty of accurately segmenting

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42

Shkurat, Oksana. "SMOOTHED CONTOUR DETECTION METHOD FOR ARBITRARY SHAPE OBJECT OF IMAGES." Grail of Science, no. 14-15 (June 10, 2022): 351–55. http://dx.doi.org/10.36074/grail-of-science.27.05.2022.062.

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Description of initial raster image objects by a set of contour vertices coordinates leads to increase efficiency of the retrieval, classification and recognition of graphical data in information systems. In this paper the smoothed contour detection method for objects of raster images is considered. The developed method is based on application of interpolation function for partial differential equation solutions and smoothed function for post-processing of detected contours. The accuracy of contour reproduction for raster image objects is increased on 4.87% by applying the developed method com

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Wu, Yi-Cheng Daniel. "An Extension of the Minimally Divergent Contour Network: Considering Nonconsecutive Repeated Contour Pitches." Music Theory Spectrum 41, no. 2 (2019): 341–62. http://dx.doi.org/10.1093/mts/mtz012.

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Abstract In a 2013 article, I partitioned all musical contours into fifteen types and arranged them in a network called the minimally divergent contour network (MDCN). Within the MDCN, we can examine the similarity between any two contour types by measuring the shortest path between them. However, despite the methodological efficiency, none of the fifteen types considers nonconsecutive repeated contour pitches. Prompted by this issue, this article extends the MDCN to include nonconsecutive repeated contour pitches. To demonstrate the analytic utility of the extended MDCN, I examine works by Br

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44

Henderson, John M. "Transsaccadic Memory and Integration During Real-World Object Perception." Psychological Science 8, no. 1 (1997): 51–55. http://dx.doi.org/10.1111/j.1467-9280.1997.tb00543.x.

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Abstract (sommario):

What is the nature of the information that is preserved and combined across saccadic eye movements during the visual analysis of real-world objects? The two experiments reported investigated transsaccadic memory and transsaccadic integration, respectively In the critical condition, participants were presented with one set of contours from an object during one fixation and with a complementary set of contours during the next fixation In Experiment 1, participants could at best inconsistently detect contour changes across the saccade In Experiment 2, a change in visible contour had no influence

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45

McDermott, Josh H., Andriana J. Lehr, and Andrew J. Oxenham. "Is Relative Pitch Specific to Pitch?" Psychological Science 19, no. 12 (2008): 1263–71. http://dx.doi.org/10.1111/j.1467-9280.2008.02235.x.

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Abstract (sommario):

Melodies, speech, and other stimuli that vary in pitch are processed largely in terms of the relative pitch differences between sounds. Relative representations permit recognition of pitch patterns despite variations in overall pitch level between instruments or speakers. A key component of relative pitch is the sequence of pitch increases and decreases from note to note, known as the melodic contour. Here we report that contour representations are also produced by patterns in loudness and brightness (an aspect of timbre). The representations of contours in different dimensions evidently have

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46

Wang, Quande, and Bugao Xu. "A coupled-contour model for effective segmentation of cotton cross-sections in wide-field microscopic images." Textile Research Journal 87, no. 12 (2016): 1509–21. http://dx.doi.org/10.1177/0040517516654113.

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Abstract (sommario):

Image analysis of a fiber cross-section can provide direct measurements for cotton maturity. Effective segmentation of fiber contours in a cross-sectional image is paramount for accurate fiber geometrical measurements. In a wide-field microscopic image, the adhesion, breakage, and ambiguity (low contrast or noise) of fiber contours make the segmentation rather challenging. This paper presents a new approach for contour segmentation that takes advantage of the shape features of the triple concentric contours, called the coupled-contour model (CCM), of a cross-section, and a CCM-based algorithm

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Alsamman, A., and M. Syed. "RGB-BASED DEEP SURFACE WATER CONTOUR DETECTION." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B3-2022 (May 30, 2022): 827–32. http://dx.doi.org/10.5194/isprs-archives-xliii-b3-2022-827-2022.

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Abstract. The application of remote monitoring of surface water has focused primarily on the detection of water bodies using expensive multi-spectral IR sensors. However, critical information about surface water bodies, particularly the dynamic behavior, is better derived from water contours. We show that water body detection is inadequate in accurately capturing the contours. Furthermore, we argue that RGB-based detection should be sufficient for accurate water detection. We present a new global dataset of remote sensing images obtained from Sentinel-2 and Landsat-8 missions and contour label

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48

Sumi, Shigemasa. "Kinetic Contours in Rotating Objects." Perception 18, no. 3 (1989): 293–302. http://dx.doi.org/10.1068/p180293.

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Abstract (sommario):

Kinetic contours seen in rotating objects provide evidence about contour function in a kinetic condition. It was observed that (i) when an object with an arc-shaped edge in its outline is rotated, a kinetic contour arises from the rotating arc and bounds a ‘figure’; (ii) the kinetic contour not only protects the enclosed area of this figure from the destruction caused by motion, but also interrupts the continuity of the surroundings; (iii) kinetic contours are generally perceived to be organized into discs which appear as amodally completed forms in such a way that one object is hidden behind

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49

Cheng, Xiaoqi, Junhua Sun, and Fuqiang Zhou. "A Fully Convolutional Network-Based Tube Contour Detection Method Using Multi-Exposure Images." Sensors 21, no. 12 (2021): 4095. http://dx.doi.org/10.3390/s21124095.

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Abstract (sommario):

The tube contours in two-dimensional images are important cues for optical three-dimensional reconstruction. Aiming at the practical problems encountered in the application of tube contour detection under complex background, a fully convolutional network (FCN)-based tube contour detection method is proposed. Multi-exposure (ME) images are captured as the input of FCN in order to get information of tube contours in different dynamic ranges, and the U-Net type architecture is adopted by the FCN to achieve pixel-level dense classification. In addition, we propose a new loss function that can help

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Liu, Guoqi, and Haifeng Li. "Robust Evolution Method of Active Contour Models and Application in Segmentation of Image Sequence." Journal of Electrical and Computer Engineering 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/3493070.

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Abstract (sommario):

Active contour models are widely used in image segmentation. In order to obtain ideal object boundary, researchers utilize various information to define new models for image segmentation. However, the models could not meet all scenes of image. In this paper, we propose a block evolution method to improve the robustness of contour evolution. A block matrix is consisted of contours of former iterations and contours of shape prior, and a nuclear norm of the matrix is a measure of the similarity of these shapes. The constraint of the nuclear norm minimization is imposed on the evolution of active

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