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A Method for Adaptive Adjustment of γ Curve of Human Iris Image

An adaptive adjustment, iris image technology, applied in the acquisition/recognition of eyes, instruments, calculations, etc., can solve problems such as difficult adjustment, inconsistent iris images, etc., to avoid deviations

Active Publication Date: 2021-12-10
FOCTEK PHOTONICS LNC
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Problems solved by technology

[0005] However, for the same camera equipment, the iris images collected by different people are not consistent, that is, it is difficult to adjust a set of γ parameters to meet the image requirements of the iris of all subjects

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  • A Method for Adaptive Adjustment of γ Curve of Human Iris Image
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  • A Method for Adaptive Adjustment of γ Curve of Human Iris Image

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Embodiment Construction

[0056] 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 combination with specific embodiments and with reference to the accompanying drawings. 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.

[0057] Such as Figure 1-4 As shown, a kind of method that the present invention proposes to the adaptive adjustment of human eye iris image gamma curve comprises the following steps:

[0058] S1: Count the number of pixels of all pixel values ​​in the original image, form a histogram of pixel values, and smooth the histogram curve;

[0059] S2: Use the curve characteristics of the obtained smooth histogram to extract t...

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Abstract

A method for adaptively adjusting the gamma curve of the iris image of the human eye, comprising the steps of: counting the number of pixel points of all pixel values ​​in the original image, forming a histogram of pixel values, and smoothing the histogram curve; using the obtained According to the curve characteristics of the smooth histogram, the typical feature values ​​of the eyeball area are extracted: the median value of the pixel values ​​occupied by the pupil and iris is extracted, and then the pixel value range of the sclera area is estimated; according to the requirements of the image standard, the pupil, iris, sclera and The eigenvalues ​​of the eyelid area are stretched to the specified value, and the required γ curve is fitted. At the same time, it meets the requirements of the iris area for image contrast. From the resulting curve, determine the target values ​​corresponding to all 0‑255 pixel values. The invention can automatically adjust the online gamma curve to the collected iris image, avoiding the deviation caused by the fixed gamma curve to the iris images of different human eyes.

Description

technical field [0001] The invention relates to the technical field of digital image processing and intelligent video monitoring, in particular to a method for adaptively adjusting the gamma curve of the iris image of the human eye. 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. [0003] 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". [0004] Cameras with different specifications have different parameters for capturing images, and the images need to be adjusted, including exposure time, white balance, focus, and gamma curve. Among them, the γ curve can adjust ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06K9/46G06K9/44
CPCG06V40/193G06V10/34G06V10/50G06V10/56
Inventor 孙敬牛同斌
Owner FOCTEK PHOTONICS LNC