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Face image quality evaluation method and device

A face image and evaluation method technology, which is applied in the fields of image processing and biometrics, can solve the problems that the quality score does not conform to the intuitive evaluation of face images, depict the clarity of images, etc., and achieve the effect of accurate and reliable evaluation results

Active Publication Date: 2019-11-15
BEIJING EYECOOL TECH CO LTD
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Problems solved by technology

However, both solutions have the same problem: the final quality score may not conform to people's intuitive evaluation of face images, and it is difficult to accurately describe the clarity of the image

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  • Face image quality evaluation method and device
  • Face image quality evaluation method and device

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Embodiment Construction

[0064] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0065] On the one hand, an embodiment of the present invention provides a method for evaluating the quality of a face image, such as Figures 1 to 7 shown, including:

[0066] Step S1: Obtain the face image to be evaluated;

[0067] In this step, various methods known to those skilled in the art in the prior art can be used to obtain the face image to be evaluated, such as the AdaBoost face detection algorithm using Haar features.

[0068] Step S2: performing normalization processing on the face images to be evaluated to obtain the first face image;

[0069] In this step, the face image to be evaluated is normalized and adjusted to a uniform size to obtain the first face image, for example, 128*128.

[0070] Step S3: Evaluate the first face image I by...

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Abstract

The invention discloses a face image quality evaluation method and device, and belongs to the field of image processing and biological recognition. The human face image quality evaluation method comprises the steps of obtaining a to-be-evaluated human face image; normalizing the face image to be evaluated to obtain a first face image; evaluating the first face image by using a blind / non-referenceimage spatial domain quality evaluation algorithm to obtain a first quality score representing the quality of the face image to be evaluated; correcting the first quality score according to a brightness value and a fuzzy value to obtain a second quality score representing the quality of the to-be-evaluated face image, the fuzzy value being one or more of a spatial domain gray fuzzy value, a frequency domain fuzzy value and a spatial domain texture fuzzy value; and evaluating the quality of the to-be-evaluated face image according to the second quality score. The method and device conform to the evaluation mode of people on the image, and can ensure that the evaluation result is more accurate and reliable.

Description

technical field [0001] The invention relates to the technical fields of image processing and biometric identification, in particular to a method and device for evaluating the quality of human face images. Background technique [0002] With the popularization of digital imaging devices such as smart phones and digital cameras and the rapid development of Internet services, images have become an important medium of communication. People are exposed to a large number of images every day. Problems such as distortion will seriously affect people's visual senses. [0003] In the biometric system, some studies have pointed out that most of the matching errors are caused by low-quality input images, and high-quality images will improve the accuracy of recognition. In particular, in the face recognition system, if the quality of the face image captured by the front-end camera is poor, too many recognition failures will be caused when the back-end recognition is performed, resulting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
CPCG06T7/0002G06T2207/30168G06T2207/30201
Inventor 刘守宪孔勇
Owner BEIJING EYECOOL TECH CO LTD
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