Method and apparatus for blocking effect reduction in images
First Claim
Patent Images
1. A method for minimizing blocking effects in a blocking image caused by prior performance of a discrete cosine transform (DCT) and quantization process, said blocking image described by blocking image data comprising blocks of pixel data, said method comprising the steps of:
- determining whether at least one blocking point occurs respectively at boundary points of a block based upon a pre-specified range of values indicative of a blocking point;
if at least one blocking point is identified; and
for each blocking point identified;
determining an adjustment value based upon a blocking step and local variance; and
adjusting blocking data corresponding to pixel locations adjacent to the blocking point and neighboring pixels to the adjacent pixels.
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Abstract
An apparatus and method for post processing image data which previously was encoded using a discrete cosine transform in order to remove resulting blocking effects. Possible blocking points are examined to determine whether blocking points exist. If blocking points are determined, an adjustment value for each blocking point is computed and proportionately utilized to adjust the adjacent and neighboring pixels.
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Citations
21 Claims
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1. A method for minimizing blocking effects in a blocking image caused by prior performance of a discrete cosine transform (DCT) and quantization process, said blocking image described by blocking image data comprising blocks of pixel data, said method comprising the steps of:
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determining whether at least one blocking point occurs respectively at boundary points of a block based upon a pre-specified range of values indicative of a blocking point; if at least one blocking point is identified; and for each blocking point identified; determining an adjustment value based upon a blocking step and local variance; and adjusting blocking data corresponding to pixel locations adjacent to the blocking point and neighboring pixels to the adjacent pixels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for minimizing blocking effects in a blocking image caused by prior performance of a discrete cosine transform (DCT) and quantization process, said blocking image described by blocking image data comprising blocks of pixel data, said apparatus comprising:
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an input device for receiving blocking image data; a processor coupled to the input device, said processor comprising a central processing unit and memory, said processor determining whether at least one blocking point occurs respectively at boundary points of a block based upon a pre-specified range of values indicative of a blocking point; and
if at least one blocking point is determined, for each blocking point identified, determining an adjustment value based upon a blocking step and local variance and adjusting pixel data corresponding to pixel locations adjacent to the blocking point and neighboring pixels to the adjacent pixels. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification