Title:
VIDEO SIGNAL CODER AND CODING METHOD
Document Type and Number:
Japanese Patent JPH09214971
Kind Code:
A
Abstract:
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.
Inventors:
SEN KATSUFUMI
RI SHINKAKU
BUN CHIYUUKI
BOKU KOUKUN
KIN ZAIKIN
RI SHINKAKU
BUN CHIYUUKI
BOKU KOUKUN
KIN ZAIKIN
Application Number:
JP28538196A
Publication Date:
August 15, 1997
Filing Date:
October 28, 1996
Export Citation:
Assignee:
GENDAI DENSHI SANGYO KK
International Classes:
H04N19/625; G06T9/00; H04N1/41; H04N19/129; H04N19/136; H04N19/18; H04N19/189; H04N19/423; H04N19/60; H04N19/85; H04N19/93; (IPC1-7): H04N7/30; H04N1/41
Attorney, Agent or Firm:
Koji Nagato
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