Method for enhancing contrast of color image displayed on display system and image processing system utilizing the same

摘要

The present invention provides a method for enhancing contrast of a color image displayed on a display system and an image processing system utilizing the same. In the present invention, the gray values of R, G, and B components of one color image are separately counted during processing the image. When calculating the corresponding output values for the gray values of R, G, and B components in each pixel, they are adapted to ratios between the gray values of R, G, and B components. Therefore, the present invention can effectively maintain the color distribution for a considerable degree and greatly enhance the image contrast.

主权项

1. A method for enhancing contrast of a color image displayed on a display system, said method comprising steps of:
A. providing the color image, which has a plurality of pixels, each pixel having gray values of primaries including red, green, and blue; B. respectively measuring quantity distribution of the gray values of red component, the gray values of green component, and the gray values of blue component for all the pixels in the color image; C. computing respective transformation curves for the gray values of red component, the gray values of green component, and the gray values of blue component for all the pixels according to the quantity distribution measured in Step B; and D. calculating a corresponding output value for the gray value of red component in one of the pixels according to transformed values obtained by introducing the gray value of red component of said pixel into the respective transformation curves and weighting coefficients respectively corresponding to the transformed values, calculating a corresponding output value for the gray value of green component of said pixel according to transformed values obtained by introducing the gray value of green component of said pixel into the respective transformation curves and weighting coefficients respectively corresponding to the transformed values, calculating a corresponding output value for the gray value of blue component of said pixel according to transformed values obtained by introducing the gray value of blue component of said pixel into the respective transformation curves and weighting coefficients respectively corresponding to the transformed values.