Patent ID: 7224843
Filing Date: 2007-05-29
Classification: G09G,H04N

Abstract:
1. An apparatus for binary-coding an input image to output a binary-coded image, the apparatus comprising: a local windowing unit for locally windowing a region of the input image on a basis of a current pixel thereby forming a locally windowed region; a local average detector for detecting a local average of the pixel values in the locally windowed region; a mask critical value generator for generating a mask critical value corresponding to the current pixel; an offset generator for generating an offset of the input image; a weighting factor supply unit for supplying a local average weighting factor, a mask critical value weighting factor, and an offset weighting factor, by using the pixel values of pixels in the locally windowed region and the local average; a detector for detecting a local adaptive critical value for the current pixel by using the local average, the mask critical value, and the offset, wherein the local average, the mask critical value, and the offset are affected by respective weighting factors; and a comparator for outputting a binary-coded pixel value corresponding to the current pixel by comparing the local adaptive critical value with a current pixel value.