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Aa wavelet model of ganglion cells array and its application in image representation

Aa wavelet model of ganglion cells array and its application...

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14th Pacific-Rim Conference on Multimedia, PCM 2013

作者： Weng, Dawei Wang, Yunhong Wei, Hui Huang, Di IRIP Lab Beihang Univ. Beijing China Department of Computer Science Laboratory of Cognitive Model and Algorithm Fudan Univ. Shanghai China

ISBN: (纸本)9783319037301

In this paper, we explore a new local image descriptor based on the modeling of ganglion cells array at the retina. We first introduce the mathematical model of a single ganglion cell and detailed distribution characteristics of ganglion cells array. From above evidence, we find out that the features of ganglion cells array are similar with wavelets in nature. Hence, a set of novel wavelet basis functions is constructed, which well fit these features. Furthermore, we discover that the modeling wavelets are in possession of tight frame property in its corresponding spatial domain expression, that is, multiple scales, shifts, phases of the spatial wavelet basis functions form a tight frame of the L2 Hilbert space, which is helpful to extract strongly distinctive and slightly redundant information in the image matching task. Finally, we obtain an efficient descriptor, state-of-the-art ones. Additionally, the proposed descriptor is easier to construct and much faster to compute. Evaluated in the image matching task on the Multi-view Stereo Correspondence Data set, the results demonstrate its effectiveness. © Springer International Publishing Switzerland 2013.

关键词： Image matching

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A Shape Recognition Method Based on Graph- and Line-Contexts

A Shape Recognition Method Based on Graph- and Line-Contexts

引用

International Conference on Tools for Artificial Intelligence (ICTAI)

作者： Hui Wei Jinwen Xiao Lab of Cognitive Model and Algorithm Fudan University Shanghai China

The shape, or contour, of an object is usually stable and persistent, so it is a good basis for invariant recognition. For this purpose, two problems must be addressed. The first is to obtain clean edges, and the second is to organize those edges into a structured data form upon which the necessary manipulations and analysis may be performed. Simple cells in the primary visual cortex are specialized in orientation detection, so the neural mechanism can be simulated by a computational model, which can produce a fairly clean set of lines, and all of them in vectors rather than in pixels. Then a line-context descriptor was designed to describe geometrical distribution of lines in a local area. All lines were also recorded by a weighted graph, and its minimum spanning tree can be used to describe the topological features of an object. An iterative matching algorithm was developed by combining line-context descriptors and minimum spanning tree, and was shown to match objects of the same type but with different shapes very well. Our results suggest that key to representation efficiency of searchable trees is to apply a mid-level line-context. This once more confirms the crucial role played by simple cells in visual processing path, for its preprocessing can greatly ease the subsequent processing.

关键词： Shape Computational modeling Image segmentation Image color analysis Educational institutions Image edge detection Visualization

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An orientation detection model based on fitting from multiple local hypotheses 1

引用

19th International Conference on Neural Information Processing, ICONIP 2012

作者： Wei, Hui Ren, Yuan Lab. of Cognitive Model and Algorithm School of Computer Science Fudan University Shanghai 200433 China

ISBN: (数字)9783642344817

ISBN: (纸本)9783642344800

Orientation detection is an important step in image understanding. Simple cells in the primary visual cortex are sensitive to stimuli of specific orientation. Hubel and Wiesel's classical theory attributes orientation selection in a simple cell to the aligned receptive fields of the retinal ganglion cells and the lateral geniculate nucleus cells. It is hypothesized that these receptive fields are similar in size and sub-structure. Current anatomical and electrophysiological evidence is not sufficient to support this geometric-arrangement-based model. Additionally, this feedforward model is incomplete in the implementation details of neural computation. The proposed algebraic model satisfies local constraints from afferent neurons and estimates the orientation of the stimulus. This constraint satisfaction based approach achieves desirable results on challenging image dataset, and can also be used to explain visual illusions. © 2012 Springer-Verlag.

关键词： Cells

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A Bio-inspired model for Image Representation and Image Analysis

A Bio-inspired Model for Image Representation and Image Anal...

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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： Hui Wei Qingsong Zuo Bo Lang Lab of Cognitive Model and Algorithm School of Computer Science Fudan University Shanghai China

This paper proposes a model for image representation and image analysis using a multi-layer neural network, which is rooted in the human vision system. Having complex neural layers to represent and process information, the biological vision system is far more efficient than machine vision system. The neural model simulate non-classical receptive field of ganglion cell and its local feedback control circuit, and can represent images, beyond pixel level, self-adaptively and regularly. The results of experiments, rebuilding, distribution and contour detection, prove this method can represent image faithfully with low cost, and can produce a compact and abstract approximation to facilitate successive image segmentation and integration. This representation schema is good at extracting spatial relationships from different components of images and highlighting foreground objects from background, especially for nature images with complicated scenes. Further it can be applied to object recognition or image classification tasks in future.

关键词： Image representation Computational modeling Image color analysis Biological system modeling Neurons Wavelet transforms Radio frequency

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Neural encoding based on frequency states using multi-spike train data

Neural encoding based on frequency states using multi-spike ...

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2010 IEEE 5th International Conference on Bio-Inspired Computing: Theories and Applications, BIC-TA 2010

作者： Hu, Fanxing Wei, Hui Lab of Algorithm for Cognitive Model School of Computer Science and Technology Fudan University Shanghai China

ISBN: (纸本)9781424464388

Understanding the way how the neural networks encode outer stimulus and inner decision-making process is a key problem in neuroscience as well as in artificial intelligence. Although researchers have proposed several assumptions and related models, the supporting biological evidences are rarely provided. Our task involves finding an encoding method based on neuron firing frequency states and its transformation model under certain stimulus. Besides, a new method to analyze spikes train data is also proposed which is proved effective here. Then, the results by analyzing multi-microelectrodes simultaneous recorded spike train from temporal cortex and hippocampus of mouse experiment is shown, supporting and validating this model. © 2010 IEEE.

关键词： Microelectrodes

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Neural encoding based on frequency states using multi-spike train data

Neural encoding based on frequency states using multi-spike ...

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International Conference on Bio-Inspired Computing: Theories and Applications, BICTA

作者： Fanxing Hu Hui Wei Lab of Algorithm for Cognitive Model School of Computer Science & Technology Fudan University Shanghai China

ISBN: (纸本)9781424464371

关键词： Systematics

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3D information acquisition from rectangles and circles in single images

3D information acquisition from rectangles and circles in si...

引用

2009 WRI World Congress on Computer Science and Information Engineering, CSIE 2009

作者： Ren, Yuan Wei, Hui Lab. of Algorithm for Cognitive Model School of Computer Science Fudan University Shanghai 200433 China

ISBN: (纸本)9780769535074

This paper presents a monocular approach of partially recovering three-dimensional information from rectangles and circles with proper prior knowledge. Taking image-formation process as projective transform, we first work out the focal length of an image with a common perspective rectangle and further obtain normal vectors of the supporting planes of rectangles and circles and relative depths of each point on the planes with respect to camera coordinate system. The absolute depths and other information about lengths and distances are also acquirable with reasonable estimation or measurement of side lengths and radius. The experimental results suggest good feasibility and acceptable precision of our approach. © 2008 IEEE.

关键词： Geometry

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COMBINING DIFFERENT INTERESTING POINT DETECTORS FOR OBJECT CATEGORIZATION

COMBINING DIFFERENT INTERESTING POINT DETECTORS FOR OBJECT C...

引用

2009 International Conference on Machine Learning and Cybernetics(2009机器学习与控制论国际会议)

作者： HUI-LAN LUO YUAN REN HUI WEI Lab of Algorithm for Cognitive Model School of Computer Science Fudan University Shanghai 200433 Lab of Algorithm for Cognitive Model School of Computer Science Fudan University Shanghai 200433

Many interesting point detectors have been proposed in the literature. It is unclear which detectors are more appropriate and how their performance depends on the task. We propose to use different detectors to gain different cues of images. Then an ensemble of classifications can be obtained, each based on one cue. The use of classification ensemble to categorize new images can lead to improved performance. Detailed experimental analyses on several datasets show that our ensemble approaches are well resistant to the variations in view, lighting, occlusion and the intra-class variations and achieve state-of-the-art performance in categorization.

关键词： Interesting point Object categorization Ensemble learning

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Object Recognition Using Words model of Optimal Size in Histograms of Oriented Gradients

Object Recognition Using Words Model of Optimal Size in Hist...

引用

International Symposium on Intelligent Information Technology Application, IITA

作者： Yuan Ren Hui Wei Huilan Luo Lab of Algorithm for Cognitive Model School of Computer Science Fudan University Shanghai China

This paper presents a new bag-of-words based algorithm for object recognition. Our algorithm also includes five steps: feature detection and representation, codebook generation, learning and recognition. All features are extracted as dense grids of images instead of interest point for computationally efficiency and effectiveness. While features are described by histograms of oriented gradients (HOG) rather than widely used scale invariant feature transform (SIFT). Different from previous work that randomly determine codebook size, the influence of the codebook size on the performance is also explored as another key problem. Then optimum sizes are chosen for further operation. In the training part, linear support vector machine (SVM) as well as support vector regression (SVR) is adopted due to their sati. Experiment are done on various cars from one of the most challenging databases Gaze; and the results show that our algorithm achieves desirable effect while the computational cost hardly increases.

关键词： Object recognition Histograms Image edge detection Support vector machines Computer vision Detectors Support vector machine classification Feature extraction Clustering algorithms Information technology

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POSE AND POSITION ESTIMATIONS OF REGULAR SHAPES IN MONOCULAR IMAGES

POSE AND POSITION ESTIMATIONS OF REGULAR SHAPES IN MONOCULAR...

引用

2009 International Conference on Machine Learning and Cybernetics(2009机器学习与控制论国际会议)

作者： YUAN REN HUI WEI Lab of Algorithm for Cognitive Model School of Computer Science Fudan University Shanghai P.R.China 200433

This paper presents approaches for pose and position estimations of two-dimensional regular shapes including rectangles and circles as well as particular kinds of triangles in monocular images. Part of this problem has been settled with parameters of digital cameras calibrated, which is not infeasible for all encountered images. Take the formulation of an image as perspective projection and the effective focal length of the cameras behind can be uniquely determined by only one general perspective rectangle in the image. Then with no additional condition required, the poses of those shapes concerned here with respect to the camera coordinate system can be calculated. Further, their positions can also be estimated with reasonable prior knowledge about lengths or areas. Experiment shows results desirably according with both the real fact and people's perceptions. Compared with other methods, ours are not just less complex, numerically solvable and intuitionistic but robust to errors in coordinates and changes made to images.

关键词： Pose Position Effective focal length Prior knowledge Perspective rectangle

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