Method for restoring compressed image of image processing system and apparatus therefor
AssigneeLG Electronics Inc.
InventorMin-Cheol Hong
Life of this patent
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Abstract
The present invention relates to an image processing technique, and in particular to a method for restoring a compressed image by using a hybrid motion compensation discrete cosine transform (hybrid MC/DCT) mechanism, including: a step of defining a smoothing functional having a smoothing degree of an image and reliability for an original image by pixels having an identical property in image block units; and a step of computing a restored image by performing a gradient operation on the smoothing functional in regard to the original image, thereby preventing the blocking artifacts and the ringing effects in regard to the pixels having an identical property in image blocks.
Claims26
A method for restoring a compressed image of an image processing system, comprising:
- a step for defining a smoothing functional having a smoothing degree of an image and reliability for an original image by pixels having an identical property in image block units;
- and
- a step for computing a restored image by performing a gradient operation on the smoothing functional in regard to the original image;
- wherein the smoothing functional M(f) comprises a sum of a smoothing functional MVB(f) for pixels positioned at the boundary of a block in a vertical direction, a smoothing functional MVW(f) for pixels positioned inside the block in a horizontal direction, a smoothing functional MHB(f) for pixels positioned at the boundary of a block in a horizontal direction, a smoothing functional MHW(f) for pixels positioned inside the block in a horizontal direction, a smoothing functional MT(f) for pixels moved and compensated in the temporal section, “f” indicating the original image.
An apparatus for restoring a compressed image of an image processing system, comprising:
- a decoder for decoding a coded image signal, and for outputting information of the restored image, such as the decoded image, a quantization variable, a macro block type and a motion vector;
- and
- a post processing unit for including the information of the restored image inputted from the image decoder, for defining a smoothing functional including a sum of a smoothing functional MVB(f) for pixels positioned at the boundary of a block in a vertical direction, a smoothing functional MVW(f) for pixels positioned inside the block in a horizontal direction, a smoothing functional MHB(f) for pixels positioned at the boundary of a block in a horizontal direction, a smoothing functional MHW(f) for pixels positioned inside the block in a horizontal direction, a smoothing functional MT(f) for pixels moved and compensated in the temporal section, “f” indicating the original image, and for performing a gradient operation on the smoothing functional in regard to the original image,
- the smoothing functional including a regularization parameter having weight of reliability for the original image.
A method for restoring a compressed image of an image processing system, comprising:
- a step for defining a smoothing functional having a smoothing degree of an image and reliability for an original image by pixels having an identical property in image block units;
- a step for computing a restored image by performing a gradient operation on the smoothing functional in regard to the original image;
- and
- a step for computing an iterative solution in regard to the restored image, after computing the restored image.
An apparatus for restoring a compressed image of an image processing system, comprising:
- a decoder for decoding a coded image signal, and for outputting information of the restored image, such as the decoded image, a quantization variable, a macro block type and a motion vector;
- and
- a post processing unit for including the information of the restored image inputted from the image decoder, for defining a smoothing functional including a smoothing degree of the image and reliability of an original image block unit, and for performing a gradient operation on the smoothing functional in regard to the original image,
- the smoothing functional including a regularization parameter having weight of reliability for the original image.
Dependencies are inferred from the claim text.