Method for detecting definition of iris image without reference
A technology of image clarity and detection method, applied in image enhancement, image analysis, image data processing and other directions, can solve the problems of no consideration, uncertainty of calculation results, calculation without reference iris image clarity, etc., to improve detection Efficiency and improved accuracy
Active Publication Date: 2018-10-26
北京万里红科技有限公司
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[0004] Although the above two methods have a certain effect on calculating the sharpness of the iris image on the entire image, and the speed is relatively fast, the calculation results are affected by the light intensity, hair, eyelashes, light spots, bright shadows, white noise, etc. in the entire image. , and both methods do not consider the influence of these noises, making the calculation results uncertain
[0005] To sum up, the existing iris image sharpness calculation method still has room for improvement, how to quickly and accurately calculate the no-reference iris image sharpness is still a problem to be solved urgently
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[0086] The purpose and function of the present invention will be clarified below by referring to exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it does not have any limiting effect on them, and is only intended to help those skilled in the relevant art comprehensively understand the specific details of the present invention.
[0087] like figure 1 As shown, no reference iris image clarity detection method provided by the invention comprises the following steps:
[0088] a. Select the region of interest in the iris image, and remove the noise in the region of interest: First, according to the data after iris segmentation, get the parameters of the inner and outer ellipses of the iris, and then delineate the rectangular region and two arc-shaped regions, and the overlapping parts It is the region of interest. If the height of the rectangular region is too small, it means that the defined region of interest cann...
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A method for detecting definition of iris image without reference includes steps: a, selecting region of interest in iris image and removing noise in region of interest; b. detecting bright shadows inthe region of interest in a; c. calculating the clarity of the region of interest after the illumination detection in b; d. adaptive adjustment of clarity in c; e. equalization of the region of interest histogram in a; f. calculating the definition of the equalized region of interest in e; g. fusing the two definitions calculated in the above steps. The invention adjusts the definition before thehistogram equalization of the region of interest of the iris image adaptively and fuses the definition with the definition after the histogram equalization to obtain the true definition of the current iris image.
Description
technical field [0001] The invention relates to technical fields such as image processing, pattern recognition and biological feature recognition, and in particular to a method for detecting the clarity of an iris image without reference. Background technique [0002] In the actual iris recognition process, it is first necessary to collect an iris image that meets certain requirements. Since the depth of field and collection range of iris image collection are fixed, when the user's collection distance is outside the depth of field, there will be a problem of defocusing; and Due to the light and the instrument, the collected image will have different degrees of noise, which will also make the image blurred; the appearance of the above problems makes the collected image unable to meet the definition requirements. [0003] The calculation method of iris image clarity is usually calculated in the frequency domain using two-dimensional Fourier transform technology. In actual use...
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IPC IPC(8): G06K9/00G06K9/32G06T5/00G06T5/20G06T5/40G06T5/50
CPCG06T5/20G06T5/40G06T5/50G06T2207/20221G06V40/18G06V10/25G06T5/70
Inventor 张小亮戚纪纲王秀贞
Owner 北京万里红科技有限公司