Image analysis – Image enhancement or restoration – Edge or contour enhancement
Reexamination Certificate
2007-11-27
2007-11-27
Bella, Matthew C. (Department: 2624)
Image analysis
Image enhancement or restoration
Edge or contour enhancement
C382S199000, C382S260000, C348S625000, C358S003270
Reexamination Certificate
active
10297814
ABSTRACT:
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.
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Kihara Taku
Shimazaki Shingo
Bella Matthew C.
Frommer William S.
Frommer & Lawrence & Haug LLP
Hung Yubin
Presson Thomas F.
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