Patent ID: 7142722
Filing Date: 2006-11-28
Classification: G06F

Abstract:
1. An image coding device comprising: wavelet transform means for applying to an input image low-pass filtering and high-pass filtering in at least one of a vertical and horizontal direction, quantization means for quantizing transform coefficients generated by the wavelet transform means to generate quantization coefficients, storage means for storing the quantization coefficients, substitution means for comparing the stored quantization coefficients and the quantization coefficients of the current image for coding and replacing the quantization coefficients of the current image for coding with the stored quantization coefficients in accordance with the result of the comparison, spreading means for spreading the quantization coefficients output from the substitution means into bit-planes from the most significant bit (MSB) to least significant bit (LSB), coding pass generation means for generating coding passes for each bit-plane, and coding means for arithmetic coding of the coding passes.