Method for extracting brightness characteristic quantity of face image and method for identifying face image
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
Active Publication Date: 2012-01-04
ROPEOK TECHNOLOGY GROUP CO LTD
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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.
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Embodiment Construction
[0044]The present invention will be described in detail below by embodiment:
[0045] 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.
[0046] 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 provi...
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The invention discloses a method for extracting brightness characteristic quantity of a face image. A face image identification system is utilized by the method to extract the brightness characteristic quantity of the face image. The method comprises the following steps of inputting, adjusting, marking parts, extracting and storing, wherein the extracting step comprises the following steps of: identifying a brightness value of each pixel point in an image of each part; comparing for the first time; comparing for the second time; comparing for the third time; calculating; and determining, namely sequentially extracting another pixel outside a target pixel group as a target pixel and repeating the first comparison step, the second comparison step, the third comparison step and the calculating step until all the pixels in the image of the part have brightness values. The method for extracting the brightness characteristic quantity of the face image can quickly acquire the brightness characteristic quantity of the image at 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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IPC IPC(8): G06K9/46G06K9/00
Inventor 周庆芬
Owner ROPEOK TECHNOLOGY GROUP CO LTD