Conversion of DV format encoded video data into MPEG format

摘要

A video signai conversion apparatus converts DV-format encoded compressed video data to MPEG format data, by utilizing motion flag information contained in the DV data which specifies for each of respective DCT blocks whether interlaced-frame mode DCT processing or progressive-field mode DCT processing has been applied to the block when executing DV encoding. The motion flag information can be used by a procesing mode selection section (16) to determine various MPEG encoding modes to be applied in units of MPEG macroblocks, such as selecting respective macroblocks to be subjected to interlaced-frame mode DCT processing by an orthogonal transform processing section (17) when the set of motion flags corresponding to the blocks constituting that macroblock are judged to indicate no substantial amount of motion for the macroblock, and to select progressive-field mode DCT processing when a substantial amount of motion is judged to exist. The amount of MPEG processing can thereby be readily reduced, without deterioration of image quality. <IMAGE>