USE OF NOISE-OPTIMIZED SELECTION CRITERIA TO CALCULATE SCENE WHITE POINTS

• Main Authors: KUO DAVID, BAI YINGJUN, ZHANG XUEMEI
• Format: Patent
• Language: English; Korean
• Published: 22.04.2013
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION

PURPOSE: Use of noise-optimized selection criteria for finding scene white points is provided to weight plausible neutral pixel values, thereby accurately finding the white points. CONSTITUTION: A programmable control device stores image pixel data in a memory corresponding to commands stored in a non-transitory program storage device. The programmable control device converts the image pixel data into a set of image pixel values in a color space and estimates a noise level for an image(118). The programmable control device distinguishes noise-optimized weighted table values(120). The programmable control device stores generated noise-weighted image pixel data in the memory by multiplying the image pixel values by a noise-optimized weighted table value(124). [Reference numerals] (108) RGB raw data; (110') White point calculation and balancing(using noise-weighted image data); (116) Constructing or receiving 2D histogram of image pixel data; (118) Estimating a scene noise level; (120) Identifying a weighting table(s) corresponding to an estimated scene; (122) Interpolating(if desired) between identified weighting table(s) to generate the interpolated weighting table; (124) Multiplying histogram of the image pixel data with the (interpolated) weighting table;