Video signal enhancement
AssigneeKoninklijke Philips Electronics N.V.
InventorsMichel Wouter Nieuwenhuizen, Marina Marie Pierre Nicolas
Life of this patent
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Abstract
In a video signal enhancement method, a video signal (Y) is histogram-based processed to obtain a histogram-processed video signal (Y′), and a sharpness of the histogram-processed video signal (Y′) is enhanced to obtain an output video signal (Y″) in dependence upon a sharpness enhancement control signal (CS) derived from at least the histogram-processed video signal (Y′). Advantageously, the sharpness enhancement control signal (CS) represents a derivative of the histogram-processed video signal (Y′).
Claims6
A method of video signal enhancement, comprising the steps:
- histogram-based processing a video signal to obtain a histogram-processed video signal;
- and
- enhancing a sharpness of the histogram-processed video signal to obtain an output video signal, wherein said sharpness enhancing step includes the steps:
- deriving a sharpness enhancement control signal from at least said histogram-processed video signal, said sharpness enhancement control signal representing a derivative of said histogram-processed video signal;
- and
- processing said histogram-processed video signal in dependence on the sharpness enhancement control signal to obtain said output video signal.
A video signal enhancement device, comprising:
- means for histogram-based processing a video signal to obtain a histogram-processed video signal;
- and
- means for enhancing a sharpness of the histogram-processed video signal to obtain an output video signal, wherein said sharpness enhancing means comprises:
- means for deriving a sharpness enhancement control signal from at least said histogram-processed video signal, said deriving means forming a derivative of said histogram-processed video signal to represent said sharpness enhancement control signal;
- and
- means for processing said histogram-processed video signal in dependence on said sharpness enhancement control signal to obtain said output video signal.
A method of video signal enhancement, comprising the steps:
- histogram-based processing a video signal to obtain a histogram-processed video signal;
- and
- enhancing a sharpness of the histogram-processed video signal to obtain an output video signal, wherein said sharpness enhancing step includes the steps:
- deriving a sharpness enhancement control signal from at least said histogram-processed video signal;
- and
- processing said histogram-processed video signal in dependence on the sharpness enhancement control signal to obtain said output video signal, wherein the processing step includes the step:
- spatially low-pass filtering the sharpness enhancement control signal.
Dependencies are inferred from the claim text.