METHOD FOR DECIDING FILTER COEFFICIENT FOR RESOLUTION CONVERSION, METHOD AND DEVICE FOR CONVERTING IMAGE RESOLUTION, METHOD AND DEVICE FOR RE-ENCODING VIDEO, PROGRAM FOR DECIDING FILTER COEFFICIENT FOR RESOLUTION CONVERSION, PROGRAM FOR CONVERTING IMAGE RESOLUTION, PROGRAM FOR REENCODING VIDEO, AND RECORDING MEDIUM FOR RECORDING THE PROGRAMS

摘要

PPROBLEM TO BE SOLVED: To perform contraction processing to be an almost inverse conversion of expansion processing of resolution when the resolution of a decode video is expanded at the time of decoding a video encoding stream, is contracted to the resolution before expansion at the time of re-encoding, and is re-encoded. PSOLUTION: A decode part 11 decodes a bit stream and a 420-422 conversion part 12 expands the resolution of its decoded video. In a re-encoder 20, filter coefficients for expansion processing which has been used in expanding the resolution are inputted from an information input part 22, and a reversible filter calculation part 23 calculates contraction processing filter coefficients which become reversible when the inputted filter coefficients for expansion processing are contracted to the original resolution. A 422-420 conversion part 24 contracts a resolution of a video which the video input part 21 has inputted by using filter coefficients for contract processing and a re-encoding part 25 re-encodes its result. PCOPYRIGHT: (C)2005,JPO&NCIPI