VIDEO SIGNAL CODER AND CODING METHOD

PROBLEM TO BE SOLVED: To obtain a video signal coder in which a coding efficiency for variable length coding is enhanced by providing a zigzag scanning control section and execution section to scan a transformation coefficient while skipping absence areas of the transformation coefficient in the cas...

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Bibliographische Detailangaben
Hauptverfasser:	RI SHINKAKU, KIN ZAIKIN, SEN KATSUFUMI, BUN CHIYUUKI, BOKU KOUKUN
Format:	Patent
Sprache:	eng
Schlagworte:	CALCULATING COMPUTING COUNTING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY IMAGE DATA PROCESSING OR GENERATION, IN GENERAL PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain a video signal coder in which a coding efficiency for variable length coding is enhanced by providing a zigzag scanning control section and execution section to scan a transformation coefficient while skipping absence areas of the transformation coefficient in the case of applying zigzag scanning to the transformation coefficient of a coefficient block obtained by shape adaptive discrete cosine transformation. SOLUTION: A zigzag scanning control section 100 receives a transformation coefficient outputted from a shape adaptive DCT section 10 depending on an object shape in an image and divides areas for the transformation coefficient in the converted image into a transformation coefficient presence area and an absence area and applies the presence area in the existing zigzag scanning sequence and skips the absence area. A zigzag scanning execution section 200 applies scanning to quantized coefficients by a quantizer 11 while skipping the coefficient in response to a skip signal from the zigzag scanning control section 100.