Title:
SUB BAND CODING METHOD
Document Type and Number:
Japanese Patent JP3534465
Kind Code:
B2
Abstract:
PURPOSE: To realize the sub band coding method in which a video signal is compressed at a high compression efficiency and weblet conversion with less image quality deterioration in a decoded image is adopted.
CONSTITUTION: Each quantization step width for an LH signal at a frequency band higher in the vertical direction and lower in the horizontal direction, an HL signal at a frequency band lower in the vertical direction and higher in the horizontal direction, and an HH signal at a frequency band higher in both the vertical direction and horizontal direction in a layer including a highest frequency component in a luminance signal and a color difference signal divided into plural frequency bands respectively is selected to be LH signal <HL signal <HH signal as to the luminance signal and to be HL signal <LH signal <HH signal as to the chrominance signal. Thus, the video signal is compressed at a high compression efficiency and the deterioration in the image quality of the decoded image is reduced.
Inventors:
Takahashi, Tsutomu
Application Number:
JP32870994A
Publication Date:
June 07, 2004
Filing Date:
December 28, 1994
Export Citation:
Assignee:
PIONEER ELECTRON CORP
International Classes:
G06T9/00; H04N19/60; H03M7/30; H04N19/126; H04N19/16; H04N19/169; H04N19/186; H04N19/423; H04N19/635; H04N19/80; H04N19/85; H04N19/93; H04N19/96; (IPC1-7): H04N7/30
Attorney, Agent or Firm:
藤村 元彦
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