Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Patent
1997-07-22
2000-06-06
Lee, Michael H.
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
382266, H04N 5208
Patent
active
060725389
ABSTRACT:
Digital image enhancement apparatus for processing an input sampled image signal having an input sample rate to generate an output, enhanced, image signal at the input sample rate comprises one or more filters for filtering and sample rate up-converting the input image signal to generate a detail signal at an intermediate sample rate higher than the input sample rate and for generating an intermediate image signal, the intermediate image signal being a sample rate up-converted version of the input image signal; a detecting circuit for detecting whether a combination of the detail signal and the intermediate image signal goes beyond predefined limits on the signal level of the output image signal and, if so, for modifying the detail signal so that a combination of the detail signal and the intermediate image signal would not go beyond the predefined limits on the signal level of the output image signal; a sample rate down-converter for converting the detail signal to a down-converted detail signal at the input sample rate; and a combiner for combining the input image signal with the down-converted detail signal at the input sample rate, to generate the output image signal.
REFERENCES:
patent: 5200824 (1993-04-01), Kageyama
patent: 5491520 (1996-02-01), Nozawa et al.
patent: 5559563 (1996-09-01), Takahashi et al.
patent: 5767900 (1998-06-01), Tanji et al.
Frommer William S.
Lee Michael H.
Sony Corporation
Sony United Kingdom Limited
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