METHOD, SYSTEM, PROGRAM, AND COMPUTER READABLE MEDIUM FOR BRIGHTNESS PRESERVATION USING A SMOOTHED GAIN IMAGE

摘要

A method for adjusting image code values, said method comprising: a) receiving a low-pass version of an input image; b) determining a low-pass gain process for said low-pass image; c) creating a low-pass gain image based on said low-pass gain process; d) spatially smoothing said low-pass gain image; e) applying said smoothed, low-pass gain image to said low-pass image thereby creating an enhanced low-pass image; f) combining said enhanced low-pass image with a high-pass version of said input image thereby creating an enhanced output image.