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An automatic exposure control method and device for iris recognition

An automatic exposure and control circuit technology, applied in character and pattern recognition, color TV parts, TV system parts, etc., can solve the problems of inability to restore texture features, poor iris texture ratio effect, etc., to achieve no Technical requirements, low cost, easy to use

Active Publication Date: 2016-06-15
WUHAN HONGSHI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot restore the lost texture features, and it is not effective for improving the contrast of iris texture.

Method used

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  • An automatic exposure control method and device for iris recognition
  • An automatic exposure control method and device for iris recognition
  • An automatic exposure control method and device for iris recognition

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Embodiment 1

[0039] An automatic exposure control method for iris recognition, comprising the following steps:

[0040] Step 1: Obtain the human eye image signal collected by the CCD image sensor;

[0041] Step 2: Perform grayscale processing on the human eye image signal to obtain a grayscale histogram signal;

[0042] Step 3: Integrate the grayscale histogram signal to obtain the integral image signal with the iris distribution area;

[0043] Step 4: Send the integrated image signal to the automatic exposure control circuit, and the automatic exposure control circuit adjusts the exposure time and offset of the integrated image signal to obtain an iris image.

[0044] Said step 4 further comprises:

[0045] Step 4.1: the FPGA in the automatic exposure control circuit calculates the exposure time according to the second threshold adjacent to the grayscale histogram signal;

[0046] Step 4.2: The camera signal processor in the automatic exposure control circuit amplifies the integrated i...

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Abstract

The invention relates to an automatic exposure control method for iris recognition, comprising the following steps: step 1: acquiring human eye image signals collected by a CCD image sensor; step 2: performing grayscale processing on the human eye image signals to obtain grayscale Histogram signal; Step 3: Integrate the grayscale histogram signal to obtain the integral image signal with iris distribution area; Step 4: Send the integral image signal to the automatic exposure control circuit, and the automatic exposure control circuit adjusts the integral image signal The exposure time and offset, get the iris image. The algorithm of the invention is simple, the amount of calculation is small, and high-quality iris texture images can be obtained quickly and accurately; image data is processed by using FPGA, which is fast and time-consuming; and the exposure time can be automatically adjusted to obtain high-quality iris texture images even under bad light conditions. High-quality iris images; changes in pupil size can be detected during exposure time adjustments.

Description

technical field [0001] The invention relates to an automatic exposure control method, in particular to an automatic exposure control method and device for iris recognition. Background technique [0002] Biometrics is a technology that uses biological characteristics to identify an individual. Biometrics include fingerprints, hand shape, retina, iris, face, etc., as well as human behavioral characteristics, including signature, voice, gait, keystrokes, and others. The iris has gradually become one of the most effective biometric features because of its uniqueness, stability and security. Iris-based automatic identification and verification systems have grown in popularity over the past few years due to the advent of efficient, available and accurate iris recognition algorithms. The iris recognition process is roughly divided into five steps: the first step is to collect iris pictures with a camera or optical scanner; the second step is to segment and locate the inner and ou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235G06K9/00
Inventor 高俊雄易开军
Owner WUHAN HONGSHI TECH
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