Consistent correction method and system of image sensor non-uniformity

A correction method and a correction system technology, which are applied in parts of TV systems, image communications, color TV parts, etc., can solve the problem of uneven brightness distribution of global high-resolution images, which affect the analysis and processing of biological experiments, wide-view Problems such as uneven field light sources, to avoid model errors and lack of universality, significant correction effect, and wide application scenarios

Active Publication Date: 2018-05-18
TSINGHUA UNIV
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Problems solved by technology

But at the same time, due to the inconsistency of the response of each image sensor, the vignetting effect of the lens, and the non-uniformity of the wide-field light source, the global high-resolution image stitched from the high-resolution images of each sub-field of view has uneven brightness distribution. Even, there are obvious splicing seams and other problems, which seriously affect the analysis and processing of later biological experiments

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[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0037] Before introducing the uniform correction method and system for the inhomogeneity of the image sensor array, the disadvantages of the traditional vignetting correction method and illumination compensation method are briefly introduced.

[0038] Traditional vignetting correction methods mainly include look-up table method, function approximation method and vignetting model correction method. The look-up table method, this kind of method calculates the compensation coefficient from the calibration template image in the gray-...

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Abstract

The invention discloses a consistent correction method and system of image sensor non-uniformity. The method comprises the following steps: obtaining a response function of each image sensor, and fitting the response function of each image sensor; converting a shot image to a relative exposure domain according the difference of the response function of each image sensor; decoupling the differenceof the response function of each image sensor, sub-field local vignetting and global illumination field vignetting, and correcting one pixel by one pixel, thereby enabling each pixel of each image sensor in an image sensor array to acquire the same gray value by using the same radiation out-degree scene; and smoothing the image gray of an overlapping region of the image. Through the method disclosed by the invention, the model error and universality absence caused by the traditional optical system modelling can be effectively avoided, the method does not depend on the overlapping rate betweenthe sub-fields and the representation way of the vignetting, so that the correction effect is obvious, and good universality and extensive application scene are provided.

Description

technical field [0001] The invention relates to the technical fields of image processing, computational imaging, and microscopic imaging, and in particular to a consistent correction method and system for inhomogeneity of an image sensor array. Background technique [0002] With the increasing development of microbial research, people's demand for imaging technology is increasing. For example, in tumor and neurological research, people have an urgent need for wide field of view, high resolution, and real-time microscopic imaging. However, traditional single-camera microscopes are limited by their spatial bandwidth and cannot simultaneously meet the needs of wide field of view and high resolution. [0003] Using camera arrays for microscopic imaging is an effective solution to simultaneously address the above requirements. But at the same time, due to the inconsistency of the response of each image sensor, the vignetting effect of the lens, and the non-uniformity of the wide...

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Application Information

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IPC IPC(8): H04N5/365H04N5/232
CPCH04N23/80H04N25/671
Inventor 索津莉王磊范静涛戴琼海
Owner TSINGHUA UNIV
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