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Extraction method for brightness characteristic quantity of face image and identification method of same

An image recognition and extraction method technology, applied in character and pattern recognition, computer parts, instruments, etc., can solve the problems of rough correction method, low efficiency, inaccurate final brightness value, etc., to achieve the effect of improving efficiency

Inactive Publication Date: 2012-05-23
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the existing technology, the correction method is rough, the final brightness value is not accurate enough, and the correction is performed for each pixel, and the efficiency is too low.

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0045] The present invention will be described in detail below by embodiment:

[0046] The facial image recognition system is used in the method for extracting the brightness feature value of the facial image provided by the present invention. The facial recognition system can determine whether the person to be recognized is one of the registered persons by comparing the stored facial features with the facial features to be checked. The facial image recognition system includes: an image storage unit, an adjustment and cutting unit, a marking unit, a brightness feature extraction unit, and a storage unit. The functions of these units are described below.

[0047] However, the facial image obtained by the camera will have brightness differences due to changes in skin color and external light, and this difference may cause recognition failures. Therefore, it is necessary to pay special attention to the luminance feature of the facial image, and therefore it is necessary to prov...

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Abstract

The invention discloses an extraction method for brightness characteristic quantity of a face image. The method utilizes a face image identification system to extract the brightness characteristic quantity, and comprises the steps of inputting, adjusting, part labeling, extracting and storing, wherein, the extracting step comprises an identification step for identifying the brightness value of each pixel point of each part image, a first comparison step, a second comparison step, a calculation step and a determination step, wherein, in the determination step, a pixel outside a target pixel group is orderly extracted to be taken as a target pixel, and then the first comparison step, the second comparison step and the calculation step are repeated until the brightness characteristic values of all pixels in the part image are obtained. The extraction method for the brightness characteristic quantity of the face image can rapidly obtain accurate brightness characteristic quantity of the image with quite high efficiency.

Description

technical field [0001] The invention relates to a method for extracting feature quantities of facial images, in particular to a method for extracting brightness feature quantities of facial images. Background technique [0002] In recent years, a practical method for identifying a person's identity using facial patterns captured by a camera has been proposed. A commonly used matching method is to calculate the similarity by, for example, performing recognition processing such as standardized correlation between the pre-set registration image and the processing target image, and finally judge whether the person to be recognized is already A person pre-registered in the identification system. [0003] When providing face recognition using this matching method in a real-time environment (such as a security system), there is a possibility that the contrast of the image will vary greatly due to changes in the weather or the time of day, and even produce Partial shadows. In a r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/46G06K9/62
Inventor 于永彦王志坚娄渊胜束玉琴
Owner HOHAI UNIV