VARIABLE LENGTH CODER OF MOTION PICTURE COMPRESSION CODING APPARATUS

• Main Author: CHUN, SEUNG MUN
• Format: Patent
• Language: English; Korean
• Published: 19.01.2002
• Edition: 7
• Subjects: BASIC ELECTRONIC CIRCUITRY; CODE CONVERSION IN GENERAL; CODING; DECODING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION

PURPOSE: A variable length coder of a motion picture compression coding apparatus, which variable-length-encodes image information passing through a low transmission line allowed by a transmission channel, is provided to recover loss due to error generated during variable length encoding. CONSTITUTION: A variable length coder of a motion picture compression coding apparatus includes a luminance block pattern processor(100) for processing a coded block pattern for luminance with a VLC code, an MCBPC(110) for defining a macro block type and coded block pattern for chrominance with the VLC code, and a motion vector difference processor(120). The variable length coder further has a luminance DCT DC size processor(130), a chrominance DCT DC size processor(140), and an input buffer(201) for buffering a DCT coefficient subjected to zigzag scan and outputting it to a run length coder(202) that outputs control information required for VLC coding. The variable length coder also has the first, second, third and fourth switches(203,204,205,206) for selectively various control signals to switch paths from the run length coder.