A method, device, equipment and medium for determining the type of optical filter

By analyzing the white balance and parameter distribution map similarity of the images acquired by the filter window in the image acquisition device, the problem of judging optical mist-transparent windows is solved, and accurate judgment under unknown filter arrangement and correct work of the image acquisition device is achieved.

CN114037863BActive Publication Date: 2025-03-25ZHEJIANG DAHUA TECH CO LTD
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Patent Information

Application Number
CN202111270585.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-10-29
Publication Date
2025-03-25
Estimated Expiration
2041-10-29

AI Technical Summary

Technical Problem

In the image acquisition device, when the output image is a black and white image and the filter arrangement is unknown, how to determine whether the current viewing window of the filter is an optical mist-transmissive sheet.

Method used

The first image acquired under the window of the current filter is obtained and a white balance operation is performed to obtain the second image. Then, based on the preset parameter values ​​of each pixel point in the first image and the second image, the first parameter distribution map and the second parameter distribution map are constructed, and their similarity is determined. If the similarity is greater than the preset similarity threshold, it is determined that the viewing window of the current filter is an optical mist-transmissive sheet.

Benefits of technology

It is realized that when the image output by the image acquisition device is a black and white image and the filter arrangement method is unknown, it is possible to accurately determine whether the current viewing window of the filter is an optical mist-transmissive sheet, thereby ensuring the correct working state of the image acquisition device.

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Abstract

The present invention discloses a method, device, equipment and medium for judging the type of an optical filter. In the method, a first image captured under a view window of a current filter is acquired, and a second image is obtained after a white balance operation is performed on the first image; a first parameter distribution graph is constructed according to a first parameter value of a preset parameter of each pixel point in the first image, and a second parameter distribution graph is constructed according to a second parameter value of the preset parameter corresponding to each pixel point in the second image, and the similarity between the first parameter distribution graph and the second parameter distribution graph is determined, wherein the preset parameter is at least one of a chromaticity parameter UV, a channel parameter RG, a channel parameter RB and a channel parameter GB; if the similarity is greater than a preset similarity threshold, it is determined that the view window of the current filter is an optical fog-permeable film, thereby determining whether the view window of the current filter is an optical fog-permeable film when the image output by the image acquisition device is a black and white image and the arrangement mode of the filters currently used is unknown.
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