Selective local transient improvement and peaking for video sharpness enhancement
First Claim
Patent Images
1. A method, comprising:
- determining a frequency content associated with a pixel value in an image;
linearly sharpening the pixel if the frequency content exceeds a threshold; and
non-linearly sharpening the pixel if the frequency content does not exceed the threshold.
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Abstract
A method of selectively sharpening an image may include, for at least some pixels in the image, determining a frequency content associated with a pixel value in the image. The pixel may be linearly sharpened if the frequency content exceeds a threshold. The pixel may be non-linearly sharpened if the frequency content does not exceed the threshold. In some implementations, the non-linear sharpening may include wavelet decomposition of the image and enhancement of decomposed components.
37 Citations
19 Claims
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1. A method, comprising:
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determining a frequency content associated with a pixel value in an image;
linearly sharpening the pixel if the frequency content exceeds a threshold; and
non-linearly sharpening the pixel if the frequency content does not exceed the threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system, comprising:
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a linear sharpener to selectively sharpen a pixel of an image and to output a linearly sharpened value for the pixel;
a non-linear sharpener to selectively sharpen the pixel and to output a non-linearly sharpened value for the pixel; and
a selector to choose one of the linearly sharpened value and the non-linearly sharpened value as an output value based on frequency content associated with the pixel. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method, comprising:
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sharpening a pixel in an image by a first amount using a first sharpening technique to produce a first sharpened value;
sharpening the pixel in the image by a second amount that is less than the first amount using a second sharpening technique to produce a second sharpened value;
selecting the second sharpened value if a spatial frequency associated with the pixel is high; and
selecting the first sharpened value if the spatial frequency associated with the pixel is not high. - View Dependent Claims (17, 18, 19)
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Specification