Patent ID: 6259735
Filing Date: 2001-07-10
Classification: H04N

Abstract:
A video coding device comprising:a subband-decomposer for decomposing an image being composed of N (N.gtoreq.2) kinds of luminance or chrominance components into subband images for each of components A.sup.n (1.ltoreq.n<N, where n is an integer),a coefficient coder for encoding a frequency coefficient in the subband to generate coded coefficient data for each subband,a rearranging device for conducting, on the receipt of the subbands having coded coefficient data,(1) preparation of a plurality of integrated component units, each unit composed of a combination of specified subbands from each of the respective components A.sup.n, and(2) rearrangement of the prepared integrated component units in an ascending order from the unit including relatively lower-frequency subbands to the unit including relatively higher frequency subbands, anda variable-length coder for performing variable-length encoding of the coded coefficient data included in the rearranged integrated component units,wherein when at least one kind of components A.sup.n out of said N kinds of components A.sup.n are different in size and in decomposition number of subbands from other kinds of subbands A.sup.n, the rearranging device prepares(1a) at least one integrated component unit composed of a combination of different numbers of subbands from the relatively higher frequency in the respective components A.sup.n, and(1b) other integrated component units each composed of equal numbers of corresponding subbands from the respective components A.sup.n.