Method and system for improving compressed image chroma information
OwnerGary A. Demosinventor
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Abstract
Methods, systems, and computer programs for improving compressed image chroma information. In one aspect of the invention, a resolution for a red color component of a color video image is used that is higher than the resolution for a blue color component of the color video image. Another aspect includes utilizing a lower or higher value of a quantization parameter (QP) for one or more chroma channels as compared to the luminance channel. Another aspect is use of a logarithmic representation of a video image to benefit image coding. Another aspect uses more than two chroma channels to represent a video image.
Claims87
A method for compressing image chroma information of a color video image in a video image compression system, including selecting a resolution for a red color component of the color video image that is higher than the resolution for a blue color component of the color video image.
A method for compressing image chroma information of a color video image in a video image compression system, including:
- (a) downfiltering a blue color component of the color video image to a processed blue color component having a first resolution along at least one of the horizontal and vertical image axes of the color video image;
- and
- (b) filtering a red color component of the color video image to a processed red color component having a second resolution higher than the first resolution.
A method for reducing chroma noise during compression of a color video image in a YUV video image compression system utilizing a quantization parameter (QP) during compression, including utilizing a first QP value for the Y color channel of a color video image, and a second QP value for at least one of the U and V color channels of the color video image, wherein the second QP value is less than the first QP value.
A method for achieving higher compression during compression of a color video image in a YUV video image compression system utilizing a quantization parameter (QP) during compression, including utilizing a first QP value for the Y color channel of a color video image, and a second QP value for at least one of the U and V color channels of the color video image, wherein the second QP value is greater than the first QP value.
A method for improving the coding efficiency for a color space representation of a video image originally represented as linear RGB pixel values in a video image compression system, including transforming the linear RGB pixel values of the video image to a logarithmic representation of luminance and chroma channel information.
A method for improving the video characteristics of a color video image in a video compression system, including:
- (a) selecting a set of image channels to represent the color video image, including a luminance channel and n chroma channels, where n is at least three;
- and
- (b) compressing the luminance channel and the n additional chroma channels to a compressed video image.
A computer program, stored on a computer-readable medium, for compressing image chroma information of a color video image in a video image compression system, the computer program comprising instructions for causing a computer to permit selection of a resolution for a red color component of the color video image that is higher than the resolution for a blue color component of the color video image.
A computer program, stored on a computer-readable medium, for compressing image chroma information of a color video image in a video image compression system, the computer program comprising instructions for causing a computer to:
- (a) downfilter a blue color component of the color video image to a processed blue color component having a first resolution along at least one of the horizontal and vertical image axes of the color video image;
- and
- (b) filter a red color component of the color video image to a processed red color component having a second resolution higher than the first resolution.
A computer program, stored on a computer-readable medium, for reducing chroma noise during compression of a color video image in a YUV video image compression system utilizing a quantization parameter (QP) during compression, the computer program comprising instructions for causing a computer to utilize a first QP value for the Y color channel of a color video image, and a second QP value for at least one of the U and V color channels of the color video image, wherein the second QP value is less than the first QP value.
A computer program, stored on a computer-readable medium, for achieving higher compression during compression of a color video image in a YUV video image compression system utilizing a quantization parameter (QP) during compression, the computer program comprising instructions for causing a computer to utilize a first QP value for the Y color channel of a color video image, and a second QP value for at least one of the U and V color channels of the color video image, wherein the second QP value is greater than the first QP value.
A computer program, stored on a computer-readable medium, for improving the coding efficiency for a color space representation of a video image originally represented as linear RGB pixel values in a video image compression system, the computer program comprising instructions for causing a computer to transform the linear RGB pixel values of the video image to a logarithmic representation of luminance and chroma channel information.
A computer program, stored on a computer-readable medium, for improving the video characteristics of a color video image in a video compression system, the computer program comprising instructions for causing a computer to:
- (a) select a set of image channels to represent the color video image, including a luminance channel and n chroma channels, where n is at least three;
- and
- (b) compress the luminance channel and the n additional chroma channels to a compressed video image.
A system for compressing image chroma information of a color video image a video image compression system, including:
- (a) means for selecting a resolution for a red color component of the color video image that is higher than the resolution for a blue color component of the color video image;
- and
- (b) means for applying the selected resolution to compress the color video image.
A system for compressing image chroma information of a color video image in a video image compression system, including means for:
- (a) downfiltering a blue color component of the color video image to a processed blue color component having a first resolution along at least one of the horizontal and vertical image axes of the color video image;
- and
- (b) filtering a red color component of the color video image to a processed red color component having a second resolution higher than the first resolution.
A system for reducing chroma noise during compression of a color video image in a YUV video image compression system utilizing a quantization parameter (QP) during compression, including
- (a) means for utilizing a first QP value for the Y color channel of a color video image, and a second QP value for at least one of the U and V color channels of the color video image, wherein the second QP value is less than the first QP value;
- and
- (b) means for applying the selected QP values during compression of the color video image.
A system for achieving higher compression during compression of a color video image in a YUV video image compression system utilizing a quantization parameter (QP) during compression, including:
- (a) means for utilizing a first QP value for the Y color channel of a color video image, and a second QP value for at least one of the U and V color channels of the color video image, wherein the second QP value is greater than the first QP value
- (b) means for applying the selected QP values during compression of the color video image.
A system for improving the coding efficiency for a color space representation of a video image originally represented as linear RGB pixel values in a video image compression system, including:
- (a) means for inputting linear RGB pixel values of a video image;
- and
- (b) means for transforming the linear RGB pixel values of the video image to a logarithmic representation of luminance and chroma channel information.
A system for improving the video characteristics of a color video image in a video compression system, including means for:
- (a) selecting a set of image channels to represent the color video image, including a luminance channel and n chroma channels, where n is at least three;
- and
- (b) compressing the luminance channel and the n additional chroma channels to a compressed video image.
Dependencies are inferred from the claim text.