Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Patent
1995-10-11
1998-06-16
Couso, Yon J.
Image analysis
Image enhancement or restoration
Intensity, brightness, contrast, or shading correction
382276, G06K 936
Patent
active
057684421
ABSTRACT:
A digital signal conversion apparatus converts an input video signal having a first dynamic range into a converted video signal having a dynamic range which is smaller than the first dynamic range. In particular, the conversion apparatus includes a digital signal processor (DSP) and a knee point determiner. The DSP inputs the input video signal and converts such signal into the converted video signal based on a selected one of a plurality of input/output (I/O) characteristic functions stored in the DSP. Furthermore, the DSP generates brightness information based on the magnitude of the first dynamic range of input video signal. The knee point determiner inputs the brightness information and generates knee point information based on the brightness information. As a result, the DSP selects one of the I/O characteristic functions in accordance with the knee point information such that the DSP can appropriately convert the input video signal into the converted video signal.
REFERENCES:
patent: 3946223 (1976-03-01), Harada et al.
patent: 5185656 (1993-02-01), Yamamoto
patent: 5194960 (1993-03-01), Ota
patent: 5388138 (1995-02-01), Fujiwara
Couso Yon J.
Samsung Electronics Co,. Ltd.
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