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A Method for Adaptive Adjustment of Exposure and Contrast of Human Iris Image

An adaptive adjustment and iris image technology, applied in image enhancement, image analysis, image data processing, etc., can solve the problems of inconsistency and inconsistency of iris images, achieve good real-time contrast and avoid deviation effects

Active Publication Date: 2022-02-15
FOCTEK PHOTONICS INC
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Problems solved by technology

[0003] However, for the same camera equipment, the iris images collected under different ambient brightness are not consistent, and the iris brightness of different collected objects is also different, that is, it is difficult to adjust a set of exposure and contrast parameters to meet the image requirements of all the iris of the measured subjects

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  • A Method for Adaptive Adjustment of Exposure and Contrast of Human Iris Image

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Embodiment Construction

[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0038] A kind of method that the present invention proposes to human iris image exposure and contrast self-adaptive adjustment, comprises the following steps:

[0039] S1: Using automatic exposure to collect iris images of human eyes;

[0040] S2: Analyze the collected image, and obtain the position information of the iris in the image;

[0041] S3: According to the position information of the human eye, adjust the exposure brightness statistics area or modify the ex...

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Abstract

A method for adaptively adjusting the exposure and contrast of a human iris image, comprising the following steps: using automatic exposure to collect a human iris image; analyzing the collected image; adjusting the exposure brightness statistics area or modifying the exposure statistics according to the position information of the human eye Weight, adjust the exposure time; count the number of pixels of all pixel values ​​in the human eye area in the collected image; use the curve characteristics of the obtained smooth histogram to extract the median value of the pixel values ​​​​occupied by the iris in the eye area; fine-tune the exposure time to the iris The average brightness value falls within the numerical range specified by the image standard; the histogram information of the image at this time is extracted; the contrast between the pupil and the iris, and the contrast between the sclera and the iris are improved. The present invention automatically adjusts the exposure time and contrast, avoiding the simplification of fixed exposure usage scenes and the deviation caused by fixed contrast to different iris images of human eyes.

Description

technical field [0001] The invention relates to the technical field of digital image processing and image acquisition, in particular to a method for adaptively adjusting the exposure and contrast of a human iris image. Background technique [0002] The iris is the ring-shaped textured area outside the pupil in the human eyeball. It is widely used in security systems as one of the biometric features for identification. In practical applications, before iris recognition, it is necessary to use a camera to collect images of the iris under near-infrared light. For iris images, my country has relatively strict industry standards, which need to comply with the "Security Iris Recognition Application Image Technical Requirements". Cameras with different specifications have different parameters for capturing images, and the images need to be adjusted, including exposure time, white balance, focus, and contrast. Among them, the exposure time can be adjusted within a limited range t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T5/40
CPCG06T5/40G06T2207/30041G06T5/94
Inventor 陶茜孙敬牛同斌
Owner FOCTEK PHOTONICS INC