PICTURE ENCODING SYSTEM

摘要

PURPOSE:To reproduce a picture at an arbitrary display speed by dividing conversion coeffients of respective blocks into N areas based on the spacial frequency and performing variable length encoding with each area as the unit and storing code data obtained by variable length encoding with each area as the unit and managing the code data volume with each area as the unit. CONSTITUTION:Picture data is divided to rectangular blocks by a block dividing part 1 and is converted to conversion coefficients in a DCT/quantizing part 2 by two-dimensional discrete cosine transformation and is quantized and is stored in a buffer memory 3. An address generating part 6 controls the read/ write address of the buffer memory 3. Conversion coefficients of the buffer memory 3 are zigzag scanned and are encoded by a Huffman encoding part 4. A code buffer 9 is divided to N areas, and code data is stored in correspond ing buffer areas by an encoding control part 5.