A color correction method for a satellite-terrestrial integrated area array camera
An area scan camera, color correction technology, applied in the direction of color TV, color signal processing circuit, color TV components, etc. Broad, computationally simple effects
Active Publication Date: 2019-03-26
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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The above two methods will be limited by conditions such as the surface properties of the object, the characteristics of the light source, and the photosensitive characteristics of the imaging device, which will affect the accuracy of color correction.
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[0034] Attached below figure 1 The present invention is further described in detail.
[0035] Step 1: Use the 24-color standard swatches for color calibration of the spaceborne camera during the ground test stage, calculate and save the color correction coefficients; the color calibration based on the 24-color standard swatches is a general algorithm, and the obtained correction coefficients are in the following form:
[0036]
[0037] Among them, Kr1~3, Kb1~3, Kc1~3 are RGB color correction matrix coefficients in RGB color space.
[0038] Step 2: When in-orbit application, the on-orbit camera takes pictures to obtain the original image;
[0039] Step 3: Perform primary color correction on the acquired image according to the color correction coefficient obtained in step 1;
[0040]
[0041] Among them, R', G', and B' represent the original image in RGB color space, and R, G, and B are the primary corrected image.
[0042] Step 4: convert the corrected image from the R...
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The invention discloses a satellite-ground integrated area-array camera color correction method. A method of combining ground 24-color standard palette calibration and the on-orbit Lab color space correction is adopted. The method comprises the following steps: a, performing color initial calibration by use of the 24-color standard palette; b, performing initial color correction on an acquired image; c, converting the image into an Lab color space from a RGB color space; d, computing an image color cast parameter to judge whether needs the secondary correction; e, computing a correction coefficient in combination with the original image for an image needing to be corrected; and g, converting the image into the RGB color space from the Lab color space. By use of the color correction method disclosed by the invention, the robustness and the universality of the computation are improved through two-stage of corrections based on the condition that the Lab color space cannot be limited by the scene or the prior knowledge; the application range is wide, and the computation is simple.
Description
technical field [0001] The invention relates to a color correction method for a satellite-ground integrated area array camera, in particular to a color correction method for an original image of a spaceborne camera, which can restore the true color information of the original image to the greatest extent. It can be widely used in color area array spaceborne cameras, can quickly and accurately obtain color information in unknown space, enhance the accuracy and robustness of ground image analysis, and has broad application prospects in the field of deep space exploration. Background technique [0002] There is a certain degree of deviation between the color of the image collected by the area array imaging camera and the real color of the object under different lighting conditions and environmental conditions. This deviation will affect the accuracy and robustness of subsequent image analysis. In the field of aerospace applications, due to the particularity of the space enviro...
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IPC IPC(8): H04N9/64
CPCH04N9/64H04N9/646
Inventor 解静张原野李馨陈超王震董国伟侯作勋张保贵关晨辉潘铮唐琦
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH