Patent ID: 7298915
Filing Date: 2007-11-20
Classification: H04N

Abstract:
1. An image encoding apparatus comprising: a filtering means for filtering an input image to generate a plurality of subbands different in resolution level; a quantizing means for quantizing each coefficient of the filtered input image by dividing it by a quantization-step size set for each of the subbands; a code block generating code blocks each having a predetermined size by dividing the subband; a bit plane generating means for generating a bit plane including bits from an MSB to an LSB for each of the code blocks; an encoding means for making arithmetic coding of the coding pass generated for each of the bit planes; and a means for generating an encoded stream of codes by forming a packet from the arithmetic code generated by the encoding means, the quantizing means making the quantization-step size set for the subband whose resolution level belongs to a predetermined resolution level coincide with the quantization-step size set for each subband to quantize the predetermined resolution level as that of an original image.