DEVICE AND METHOD FOR ENCODING IMAGE

摘要

PROBLEM TO BE SOLVED: To improve the image quality of a specified area by providing a coefficient operation means for executing different operations to a coefficient corresponding to a specified area image extracted in a specified area image extraction means and a coefficient corresponding to images excluding the specified area image and a means for entropy encoding the coefficients operated in the coefficient operation means, etc. SOLUTION: The positional information 103 of the specified area image extracted in a specified area image extraction part 3 is sent to a coefficient operation part 6. In the meantime, a transformation coefficient 104 outputted from a wavelet transformation part 4 is quantized by a quantization part 5 and a quantized coefficient 105 is outputted. Then, a coefficient operation is performed in the coefficient operation part 6 to the quantized coefficient 105 and the quantized coefficient 106 of the result is inputted to a bit plane scanning part 7. A coefficient group 107 for respective bit planes outputted by the bit plane scanning part 7 is finally encoded in an entropy encoding part 8 and an encoded bit stream 108 is sent out.