Patent ID: 8395822
Filing Date: 2013-03-12
Classification: G06T,H04N

Abstract:
1. An image processing method combining compression and watermark techniques, used for processing an image equally divided into a plurality of blocks, wherein each block has M×N block pixels, and M and N are positive integer, the method comprising: a. providing a watermark, and a plurality of watermark pixels in the watermark individually corresponding to one of the blocks; b. selecting one of the blocks to be a target block; c. obtaining an ordered dither array according to a maximum pixel value and a minimum pixel value of the block pixels in the target block, wherein the ordered dither array includes non-repeated M×N array elements of a specific range, and each of the array elements corresponds to one of the block pixels; d. establishing a conjugate ordered dither array corresponding to the ordered dither array according to an upper limit of the specific range; e. selecting the ordered dither array or the conjugate ordered dither array to serve as a comparison array according to the watermark pixel corresponding to the target block; f. quantifying a pixel value of each block pixel to be a first value or a second value according to the array elements in the comparison array; and g. selecting another one of the blocks to be the target block, and repeating the step c. to the step g. until all of the blocks are selected, so as to generate a compressed image inserted with the watermark.