Patent ID: 7127111

Claim:
An image coding apparatus comprising: filtering means for low-pass filtering and high-pass filtering an input image in the vertical and horizontal directions to generate subbands and then hierarchically filtering a subband comprising a low frequency component; code-block generating means for decomposing each subband generated by the filtering means into code-blocks each having a predetermined size; bit-plane generating means for generating bit-planes including bits from the most significant bit to the least significant bit every code-block; coding pass generating means for generating coding passes every bit-plane; arithmetic coding means for performing arithmetic coding in the coding passes; bit-rate control means for controlling a bit-rate to a target bit-rate on the basis of generated arithmetic codes; and packet assembling means for adding a header to the arithmetic codes subjected to the bit-rate control to assemble a packet, wherein the filtering means further filters a predetermined subband in consideration of the characteristics of the input image.