07302112 is referenced by 14 patents and cites 14 patents.

An edge enhancement circuit uses bandpass filters to separate an original video signal into low-, middle- and high-frequency band edge components which will be supplied to waveform shaping circuits. Each of the waveform shaping circuits detects an amplitude peak level of the edge component, generates a gain coefficient based on the peak level, and multiplies the original video signal by the gain coefficient. The results of multiplication are added together to generate a final detail signal. Thus, the edge enhancement circuit amplifies the amplitude of the edge component having a frequency approximate to the spatial frequency of the video signal to provide an edge enhancement based on a frequency characteristic corresponding to the spatial frequency of the video signal.

Title
Contour-emphasizing circuit
Application Number
10/297814
Publication Number
7302112 (B2)
Application Date
April 11, 2002
Publication Date
November 27, 2007
Inventor
Taku Kihara
Kanagawa
JP
Shingo Shimazaki
Kanagawa
JP
Agent
Thomas F Presson
William S Frommer
Frommer Lawrence & Haug
Assignee
Sony Corporation
JP
IPC
H04N 5/21
H04N 1/409
H04N 1/407
G06T 5/00
G06K 15/00
G06K 9/48
G06K 9/40
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