Predicting ringing artifacts in digital images
First Claim
Patent Images
1. A method of predicting a ringing artifact in an image, said method comprising the steps of:
- (a) determining a first number of pixels of a pixel block having at least one of a first pixel luminance and a neighboring pixel luminance exceeding a first threshold;
(b) determining a second number of pixels comprising pixels of said first number having a relationship between said first pixel luminance and said neighboring pixel luminance exceeding a second threshold; and
(c) predicting a ringing artifact for said block of pixels if a relationship of said second number of pixels exceeds a third threshold.
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Abstract
Ringing artifacts in digital images are predicted by determining a number of pixels of a block of pixels exhibiting luminance exceeding a luminance threshold adequate for detecting a ringing artifact and a number of these higher luminance pixels having sufficient contrast with neighbor pixels to be a likely source of a ringing artifact.
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Citations
24 Claims
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1. A method of predicting a ringing artifact in an image, said method comprising the steps of:
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(a) determining a first number of pixels of a pixel block having at least one of a first pixel luminance and a neighboring pixel luminance exceeding a first threshold;
(b) determining a second number of pixels comprising pixels of said first number having a relationship between said first pixel luminance and said neighboring pixel luminance exceeding a second threshold; and
(c) predicting a ringing artifact for said block of pixels if a relationship of said second number of pixels exceeds a third threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of predicting a ringing artifact in an image, said method comprising the steps of:
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(a) determining a first number of pixels of a pixel block having at least one of a first pixel luminance and a first neighboring pixel luminance exceeding a first threshold;
(b) determining a second number of pixels comprising pixels of said first number having a relationship between said first pixel luminance and said first neighboring pixel luminance exceeding a second threshold;
(c) determining a third number of pixels of said block having at least one of said first pixel luminance and a second neighboring pixel luminance exceeding a third threshold;
(d) determining a fourth number of pixels comprising pixels of said third number having a relationship between said first pixel luminance and said second neighboring pixel luminance exceeding a fourth threshold; and
(e) predicting a ringing artifact for said block of pixels if a relationship of said second and fourth numbers of pixels at least equals a pixel number threshold. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of predicting a location of a ringing artifact in a transform coded image, said method comprising the steps of:
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(a) dividing said image into a plurality of blocks of contiguous pixels;
(b) determining a first number of pixels of a block having at least one of a first pixel luminance and a horizontally neighboring pixel luminance exceeding a first threshold;
(c) determining a second number of pixels comprising pixels of said first number having a luminance difference between said first pixel and said horizontally neighboring pixel exceeding a second threshold;
(d) determining a third number of pixels of said block having at least one of said first pixel luminance and a vertically neighboring pixel luminance exceeding said first threshold;
(e) determining a fourth number of pixels comprising pixels of said third number having a luminance difference between said first pixel and said vertically neighboring pixel exceeding said second threshold; and
(f) predicting a ringing artifact for said block of pixels if a relationship of said second and fourth numbers of pixels at least equals a third threshold. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification