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GABOR characteristic based face sketch synthetic method and system

A synthesis method and sketch technology, which is applied in the field of face sketch synthesis based on Gabor features, can solve the problems of high-frequency information loss, synthesis effect decline, etc.

Active Publication Date: 2014-10-01
WUHAN UNIV
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Problems solved by technology

[0012] The existing sketch synthesis methods all use the Euclidean distance to measure two images or image blocks. Since the illumination has a great influence on the pixels, the high-frequency information will be lost due to the illumination change, and the synthesis effect will drop sharply. Therefore, the synthesis effect of the above method needs to be To further strengthen, it is also necessary to find a feature space that is more robust to illumination

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  • GABOR characteristic based face sketch synthetic method and system
  • GABOR characteristic based face sketch synthetic method and system
  • GABOR characteristic based face sketch synthetic method and system

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preparation example Construction

[0043] The present invention is based on the face sketch synthesis method of Gabor feature, and the concrete steps are as follows:

[0044] Step 1: Divide pixel blocks.

[0045] The input face photos, face photo samples in the training set of face photos, and face sketch samples in the face sketch training set are divided into overlapping pixel blocks by the same division method, and the input face photos are the face photos to be synthesized. The input face photos, face photo samples, and face sketch samples have the same size, and the face photo samples and face sketch samples correspond one-to-one. The size of the divided pixel block in this specific implementation is n×n.

[0046] Step 2: Extract the Gabor feature of the pixel block, obtain the Stein divergence matrix based on the covariance matrix of the Gabor feature of the pixel block, and convert the pixel space to the Stein divergence space.

[0047] This step further includes sub-steps:

[0048] 2.1 For all pixel ...

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Abstract

The invention provides a GABOR characteristic based face sketch synthetic method and system. The synthetic method comprises the following steps: dividing a face photo to be synthesized, a face photo sample and a face sketch sample into mutually overlapped pixel blocks; extracting the Gabor characteristics of each pixel block, and acquiring the Stein divergence matrix on the basis of the covariance matrix of the Gabor characteristics of the pixel block; acquiring the optimal weight on the basis of the Stein divergence matrix and the rebuilding coefficient of each pixel block of the face photo sample; adopting the optimal weight for weighting synthesis on the pixel block at the corresponding position of the face sketch sample to acquire a synthetic face sketch pixel block; integrating the synthetic face sketch pixel block to acquire the synthetic face sketch corresponding to the face photo to be synthesized. The synthetic method and system can synthesize the face sketch in higher quality, and can be applied to criminal investigation.

Description

technical field [0001] The invention belongs to the technical field of face sketch synthesis, and in particular relates to a method and system for face sketch synthesis based on Gabor features. Background technique [0002] In recent years, retrieving photos of criminal suspects from face photo databases has been widely used in law enforcement as a means of criminal investigation. However, sometimes photos of suspects cannot be obtained, so the only way is to draw a sketch of the suspect's face based on the recollections of witnesses, and then use the sketch of the face for retrieval. However, due to the obvious heterogeneity of face sketches and face photos, and the unknown psychological mechanism involved in the generation of face sketches, the accuracy of using traditional face recognition methods to identify face sketches is very low. One of the ways to solve this problem is to synthesize fake face photos or fake face sketches from face sketches and face photos. In add...

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Application Information

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IPC IPC(8): G06T3/40
Inventor 胡瑞敏关健江俊君韩镇董小慧
Owner WUHAN UNIV
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