Compensation method for improving color shadow in digital images

Abstract

The invention relates to a compensation method for improving color shadow in digital images, which is used for correcting the luminance difference of each area in the digital images caused by color shadow in the digital images. The compensation method comprises the following steps of: retrieving the color lump images of uniform color lumps; calculating the horizontal compensation coefficients of a plurality of horizontal areas of the color lump images; carrying out linear interpolation on the horizontal compensation coefficients to generate corresponding horizontal interpolation coefficients and calculating to obtain the decision horizontal correction coefficients corresponding to all horizontal areas, respectively; calculating the vertical compensation coefficients of a plurality of vertical areas of the color lump images; multiplying the decision horizontal correction coefficients with the vertical compensation coefficients to obtain the color shadow compensation coefficients of the areas of the color lump images, respectively; and multiplying the average luminance values of the areas of the color lump images with corresponding color shadow compensation coefficients, respectively to compensate the color shadow for the color lump images.

Description

technical field The invention relates to an image processing technology, in particular to a compensation method for improving the color shadow phenomenon in digital images. Background technique When a traditional digital camera device retrieves a digital image, the digital camera device resolves the reflected light into three primary colors of light, namely red (R), green (G) and blue (B), and guides the three primary colors of light to a photoelectric converter. For example, a charge-coupled device (CCD) converts the three primary colors into analog signals. The analog signals of the three primary colors are converted into digital signals by an analog-to-digital converter for output. In the above-mentioned digital camera device, when we use the digital camera device to shoot a uniform color block in a uniform brightness environment, we often find that the surrounding brightness of the digital image is darker than the brightness of the digital image center. This phenomenon...

AI Technical Summary

Problems solved by technology

Although the above method can effectively save the memory required to compensate for the color shading phenomenon, since the energy attenuation in the horizontal direction is not a linear change, but the faster the attenuation speed goes to the edge, so if a linear function is used to replace the original horizontal compensation curve, will result in an overcompensated situation

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