Patent ID: 7020341
Filing Date: 2006-03-28
Classification: H04N

Abstract:
1. A compression apparatus, comprising: an input device configured to input image data; a two-dimensional reversible wavelet transform section configured to divide the image data into frequency bands and reversibly divide a low frequency band so as to transform the image data to coefficient data; an order generation section configured to determine a target bit to be encoded; a context model section configured to create context data based on a state of context bits around the target bit; an entropy encoder configured to input the target bit and at least some of the context data and configured to generate encoded data of the target bit by performing a probability estimation based on the encoder input context data and the target bit; and a tag processing section configured to add tag information including a compression condition to a header of the encoded data; wherein the context model section and the entropy encoder are operated in parallel to perform pipeline processing.