Patent ID: 7215823
Filing Date: 2007-05-08
Classification: G06T,H04N

Abstract:
1. An image processor for performing filter processing on an expanded image when or after the image is expanded in a unit of predetermined blocks based on compressed image data compressed by image compression, in which discrete cosine transform and quantization are performed in the unit of blocks, wherein the filter processing is performed such that filter arithmetic operation is performed on one pixel in the block only based on a value of the pixel and a value of any one of pixels in an adjacent block, and such that filter arithmetic operation is performed on one of pixels in a pixel array intersecting a border between adjacent blocks when no difference between pixels exceeds a threshold value, the pixels ranging from one pixel to a border pixel positioned on the border in the same pixel array in the adjacent block, and a constant value is used as the threshold value, and wherein a threshold value for comparison with a difference between the border pixel and a adjacent pixel being adjacent to the border pixel is set larger than a threshold value for comparison with a difference between the border pixel and a pixel other than the adjacent pixel.