DOWN CONVERTING MPEG ENCODED HIGH DEFINITION SEQUENCES TO LOWER RESOLUTION WITH REDUCED MEMORY IN DECODER LOOP

摘要

MPEG encoding interlaced high-definition video stream is decoded and converted to low resolution by the reduced amount of the reference image memory MPEG decoder. It received frame and field DCT coding block is converted first receiving frame down to a DCT coding block in a field pixel block reconstructed by the conversion to the converted field DCT coded blocks. Then, vertical and horizontal IDCT IDCT is performed on the received field-coded DCT blocks and field DCT transform coding block, a suitable excess field and pixel block is generated. IDCT is a vertical N-point IDCT horizontal, a horizontal IDCT has M horizontal point IDCT, where N is the size of the block corresponding to the original, and N M. And excess field pixel block is a spatial filter is down-sampled in the vertical position. IDCT, filtering and down-sampling operation is effectively combined with a single linear operator. Field downsampling different horizontal and vertical minimum drift prediction filters to form the prediction field to be added to the surplus blocks are used. ; MPEG, low-resolution, frame, pixels, prediction filters, excess, IDCT, prediction, downsampling