Block noise detecting method and apparatus, and block noise reducing method and apparatus
First Claim
1. A block noise detecting method comprising the steps of:
- detecting a pixel boundary difference across a pixel boundary on the basis of a difference value between pixel values of adjacent pixels across the pixel boundary on a picture plane of an input image frame, and a predicted pixel value on the pixel boundary predicted from at least a plurality of pixels on one side of the pixel boundary; and
accumulating the pixel boundary differences for one image frame to detect a block noise.
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Abstract
A pixel boundary difference detector detects a pixel boundary difference across a pixel boundary on the basis of a difference value between pixel values of adjacent pixels across the pixel boundary on a picture plane of an input image frame, and a predicted pixel value on the pixel boundary predicted from at least a plurality of pixels on one side of the pixel boundary, an accumulator accumulates the pixel boundary differences for one image frame, and a block noise detector detects a block noise on the basis of a result of the accumulation. The accuracy of block noise detection is improved, the effect of block noise reduction is improved, and the picture quality is improved.
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Citations
30 Claims
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1. A block noise detecting method comprising the steps of:
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detecting a pixel boundary difference across a pixel boundary on the basis of a difference value between pixel values of adjacent pixels across the pixel boundary on a picture plane of an input image frame, and a predicted pixel value on the pixel boundary predicted from at least a plurality of pixels on one side of the pixel boundary; and accumulating the pixel boundary differences for one image frame to detect a block noise. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A block noise detecting apparatus comprising:
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a pixel boundary difference detecting means for detecting a pixel boundary difference across a pixel boundary on the basis of a difference value between pixel values of adjacent pixels across the pixel boundary on a picture plane of an input image frame, and a predicted pixel value on the pixel boundary predicted from at least a plurality of pixels on one side of the pixel boundary; an accumulating means for accumulating the pixel boundary differences for one image frame; and a block noise detecting means for detecting a block noise on the basis of a result of accumulation by said accumulating means. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A block noise reducing method comprising the steps of:
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detecting a pixel boundary difference across a pixel boundary on the basis of a difference value between pixel values of adjacent pixels across the pixel boundary on a picture plane of an input image frame, and a predicted pixel value on the pixel boundary predicted from at least a plurality of pixels on one side of the pixel boundary; accumulating the pixel boundary differences for one image frame to detect a block noise; and performing a block noise reducing process on the input image frame on the basis of the detected block noise. - View Dependent Claims (22, 23, 24, 25)
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26. A block noise reducing apparatus comprising:
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a pixel boundary difference detecting means for detecting a pixel boundary difference across a pixel boundary on the basis of a difference value between pixel values of adjacent pixels across the pixel boundary on a picture plane of an input image frame, and a predicted pixel value on the pixel boundary predicted from at least a plurality of pixels on one side of the pixel boundary; an accumulating means for accumulating the pixel boundary differences for one image frame; a block noise detecting means for detecting a block noise on the basis of a result of accumulation by said accumulating means; and a block noise reducing means for performing a block noise reducing process on the input picture frame on the basis of the block noise detected by said block noise detecting means. - View Dependent Claims (27, 28, 29, 30)
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Specification