Television – Bandwidth reduction system – Data rate reduction
Patent
1995-03-27
1997-06-10
Tran, Thai Q.
Television
Bandwidth reduction system
Data rate reduction
348700, 386 46, 386113, H04N 712, H04N 1102, H04N 1104, H04N 576
Patent
active
056381247
ABSTRACT:
A video signal processing apparatus includes a discrete cosine transform circuit for generating a DC component and an AC component by processing image data in a discrete cosine transform fashion, a motion detecting circuit for generating a coincidence detection level based on an energy ratio between the DC component and the AC component generated by the discrete cosine transform circuit, comparing a difference between a DC component of a first field or frame and a DC component of a second field or frame continuing the first field or frame of the image data with the coincidence detection level and detecting on the basis of a compared result whether the image data indicates a moving picture or a still picture, and an image inserting and extracting circuit for inserting an image into or extracting an image from image data at field or frame unit based on a detected result of the motion detecting circuit, wherein the image inserting and extracting circuit inserts an image into or extracts an image from image data at the field unit when the motion detecting circuit detects that the image data indicates a moving picture and inserts an image into or extracts an image from image data at the frame unit when the motion detecting circuit detects that the image data indicates a still picture.
REFERENCES:
patent: 5475502 (1995-12-01), Lee et al.
patent: 5493345 (1996-02-01), Ishikawa et al.
patent: 5537147 (1996-07-01), Tahara
Soda Atsumu
Takeda Takayuki
Frommer William S.
Moe Aung S.
Sinderbrand Alvin
Sony Corporation
Tran Thai Q.
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