Patent ID: 8670629
Filing Date: 2014-03-11
Classification: G06K,H04N

Abstract:
1. An apparatus comprising: an image processing unit configured to quantize an m-value image divided into a plurality of divided images for each of the divided images, wherein the image processing unit includes, a first quantization unit configured to perform n-value conversion on a pixel value in a first region in the divided image (m and n are integers, and 2≦n<m), and with respect to a second region in the divided image including the first region, a second quantization unit configured to perform the n-value conversion on a pixel value in a part in the second region except for the first region, and perform the n-value conversion on a pixel value in the first region using an error propagated by the n-value conversion of the part, wherein, if the n-value conversion is performed on a pixel value in the first region, the second quantization unit corrects parameters for quantization processing using a first quantization result in the first quantization unit or intermediate data so that a second quantization result in the second quantization unit approaches the first quantization result.