Method and circuit for adaptively enhancing contour components of a luminance signal
AssigneeSamsung Electronics Co., Ltd.
InventorsYong-cheol Park, Si-young Chin
Life of this patent
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Abstract
A contour enhancement method and circuit for adaptively enhancing a contour component of a luminance signal. In the method, a coring operation is performed with respect to the contour component. For the coring operation, a coring value is used which is adjusted according to characteristics of the contour component detected from an input luminance signal. The cored contour component is amplified by a predetermined gain, and the level of the gain-controlled contour component is limited to a predetermined threshold value to output a level-limited contour component. The level-limited contour component is then added to the input luminance signal to become a contour-enhanced luminance signal.
Claims12
A contour enhancement method for adaptively enhancing a contour component of a luminance signal, comprising the steps of:
- receiving a luminance signal;
- detecting a contour component of said luminance signal;
- filtering the noise component of said luminance signal;
- adaptively generating a coring value dependant upon a level of said luminance signal and the filtered result;
- coring said contour component using said coring value to output a cored contour component;
- amplifying the cored contour component to output a gain-controlled contour component;
- limiting the gain-controlled contour component to a threshold value to output a level-limited contour component;
- and
- adding the level-limited contour component to the luminance signal to output a contour-enhanced luminance signal.
A contour enhancement circuit for adaptively enhancing a contour component of a luminance signal, comprising:
- a contour detector for detecting a contour component from an input luminance signal;
- a coring value generator for adaptively generating a coring value responsive to the input luminance signal, the coring value generator filtering the noise component of the luminance signal;
- a non-linear processor adapted to receive the contour component from the contour detector and output a non-linearly processed contour component responsive to the coring value generator;
- and
- an adder for adding the non-linearly processed contour component to the input luminance signal to output a contour-enhanced luminance signal.
Dependencies are inferred from the claim text.