Image irradiation correcting method based on color domain mapping

The present invention discloses an image illumination correcting method based on color gamut mapping. The brightness of input image and R, G, B values after color space decomposition are separated and processed. Then, the brightness obtained by brightness enhancement calculation is multiplied by the R, G, B values after color space decomposition for restoring the image after illumination correction. The color space decomposition and brightness enhancement can increase the image contrast, better retains the color of original image and does not increase the noise of image. Simultaneously the illumination correction method adopted by the invention processes based on the pixel of image. The image switching and counting of image information are not required. The computing complexity is reducedand the hardware realization of the method is facilitated. Additionally, a complementary operation of image is adopted for high-brightness illumination environment so that the brightness enhancement operation has better versatility and can simultaneously process a plurality of complex illumination conditions.