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Method and device for representing contour feature of target image

A target image and contour feature technology, applied in the field of computer vision and pattern recognition, can solve the problems of large amount of calculation, affecting the speed of target image detection and recognition, and many dimensions, and achieve the effect of reducing the amount of calculation.

Active Publication Date: 2013-12-25
HUBEI ENG UNIV
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AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the purpose of the present invention is to provide a method and device for representing the contour features of target images, aiming at solving the problem of using the existing HOG method to describe the contour features of target images. Technical issues that affect the speed of target image detection and recognition

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  • Method and device for representing contour feature of target image
  • Method and device for representing contour feature of target image

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Embodiment 1

[0031] figure 1 The flowchart of the method for representing the contour feature of the target image provided by the first embodiment of the present invention is shown, and only the parts related to the embodiment of the present invention are shown for convenience of description.

[0032] Step S101. Obtain an edge contour image of a target image according to an edge detection algorithm.

[0033] This step first needs to obtain the edge contour image of the target image. The specific edge detection algorithm used in this embodiment is not limited, such as Canny algorithm, Sobel algorithm, Roberts algorithm, SUSAN algorithm, etc. The complexity and edge detection effect of the algorithm are different. Different, the corresponding algorithm can be selected according to the actual target image detection accuracy.

[0034] Step S102, acquiring the tangent direction of each edge pixel in the edge contour image.

[0035] The edge contour image obtained in the above step S102 is a c...

Embodiment 2

[0042] figure 2 The flowchart of the method for representing the contour feature of the target image provided by the second embodiment of the present invention is shown, and only the parts related to the embodiment of the present invention are shown for convenience of description.

[0043] Step S201, acquiring the edge contour image of the target image according to the edge detection algorithm;

[0044] Step S202, performing denoising and edge restoration processing on the edge contour image.

[0045] In order to make the obtained edge contour image clearer and more accurate, this step also needs to perform denoising and edge restoration processing on the edge contour image, and the denoising algorithm and edge restoration algorithm are not specifically limited in this implementation.

[0046] Step S203, obtaining the position vector of each edge pixel in the edge contour image where dx i,j 、dy i,j Respectively represent the horizontal and vertical distances between the ...

Embodiment 3

[0054] Figure 9 The structure of the object image contour feature representation device provided by the third embodiment of the present invention is shown, and only the parts related to the embodiment of the present invention are shown for convenience of description.

[0055] The target image contour feature representation device provided in this embodiment includes:

[0056] An edge detection unit 901, configured to obtain an edge profile image of the target image according to an edge detection algorithm;

[0057] a direction acquisition unit 902, configured to acquire the tangent direction of each edge pixel in the edge contour image;

[0058] A direction statistics unit 903, configured to divide the edge contour image into several blocks, and count the tangent direction histogram of the edge pixels in each block in multiple directions;

[0059] The contour feature representation unit 904 is used to normalize the tangent direction histogram of each block to obtain a corre...

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Abstract

The invention is applied to the technical field of computer vision and mode identification and provides a method and device for representing the contour feature of a target image. The method includes the steps that an edge contour image of the target image is obtained according to the edge detection algorithm; tangent directions of all edge pixel points in the edge contour image are obtained; the edge contour image is divided into multiple blocks, and in addition, statistics is performed on histograms in the tangent directions of the pixel points in all the blocks in multiple directions; corresponding histogram vectors are obtained by processing the histograms in the tangent directions of all the blocks in a normalization mode, the obtained vectors of all the histograms are connected in a serial mode according to a sequence, and an edge feature vector representing the contour feature of the whole target image is generated. According to the scheme for representing the contour feature of the target image based on the histograms of the grid-shaped edge directions, only the tangent directions of the edge pixels need to be calculated, the finally-obtained edge feature vectors are low in dimensionality and low in calculated amount, and a foundation is provided for subsequent target image detection and identification.

Description

technical field [0001] The invention belongs to the technical field of computer vision and pattern recognition, and in particular relates to a method and device for expressing contour features of a target image. Background technique [0002] In the complex and massive visual information, how to quickly and accurately extract the features of the target and express them effectively is a key issue in computer vision and video understanding, which is important for reducing the dimension of visual information processing and improving the cognitive level of visual computing meaning. The contour feature expression of the target image plays a vital role in target recognition. The feature selection principle is that the contour feature of the selected target image is distinguishable from the background feature. Only in this way can the target be recognized in the feature space. . [0003] In the method of selecting and describing the contour features of the target image, the Histog...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06T5/40G06T5/00G06T7/00
Inventor 王光伟熊曾刚兰义华叶从欢张凯兵
Owner HUBEI ENG UNIV
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