A multi-band flat-field correction method, device and computer-readable medium
A flat-field correction and waveband technology, which is applied in the field of image processing, can solve the problems that the image pixel response cannot be adjusted effectively, and the correction coefficient is not considered.
Active Publication Date: 2021-10-15
ゼジャンハーレイテクノロジーカンパニーリミテッド
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[0003] The traditional flat-field correction algorithm is mainly corrected by multiplication. The correction formula is Y=X*k, where Y is the output gray value after correction, X is the original output gray value of the image sensor, and each pixel in the image corresponds to A correction coefficient K; however, this correction coefficient does not consider the influence of the band in the light source on the response of the pixel, so the traditional flat-field correction algorithm is only suitable for the correction of image pixels in the same light source band environment, for image images in different light source band environments meta-responses cannot implement valid adjustments
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[0025] Exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, which include various details of the embodiments of the present invention to facilitate understanding, and they should be regarded as exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
[0026] Such as figure 1 As shown, a schematic flowchart of a multi-band flat-field correction method according to an embodiment of the present invention. A multi-band flat-field correction method, the specific operation process is as follows: S101, separately obtain the gray value corresponding to the first gray image of the monochromatic area collected by the image senso...
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The invention discloses a multi-band flat-field correction method, device and computer-readable medium, belonging to the technical field of image processing. The method includes: determining the flat-field gray level of the target area under the natural light source based on the gray scale weights corresponding to the three bands of the target area under the natural light source environment and the three gray scale values of the target area collected under the three band light source environments After that, for any pixel in the target area: based on the position information and size information of the target area, the position information of the pixel, and the flat-field gray value of the target area, determine the gray scale correction coefficient of the pixel; and use The gray correction coefficient corrects the gray value of the pixel to obtain the flat gray value of the pixel. Thus, all the pixels in the target area can have the same grayscale response value, which solves the problem in the prior art that the image sensor responds inconsistently to the pixels due to the change of the wavelength band of the light source.
Description
technical field [0001] The present invention relates to the technical field of image processing, in particular to a multi-band flat-field correction method, device and computer-readable medium. Background technique [0002] In the process of image acquisition by the image sensor, due to the image sensor's response to the light source band, color crosstalk, process, and design, there will be inconsistencies in the response of each pixel in the grayscale image. In the image generated after the image sensor captures a uniform object, there are inconsistencies in the gray values of multiple pixels, such as vertical stripes, horizontal stripes, and regional gray inconsistencies. However, in the field of industrial vision such as intelligent manufacturing, the inconsistent gray value of multiple pixels in the same image will seriously affect the accuracy of the calculation results. For this reason, in applications such as high-end industrial cameras that require fine detection ...
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IPC IPC(8): H04N5/202
CPCH04N5/202
Inventor 王宗苗史为平吕焱飞
Owner ゼジャンハーレイテクノロジーカンパニーリミテッド