Methods and systems for improving display resolution in achromatic images using sub-pixel sampling and visual error filtering.
First Claim
Patent Images
1. A method for converting a first image of a first resolution to a second image of a second resolution, with reduced visible errors, said method comprising the acts of:
- performing sub-pixel sampling on said first image;
converting said first image into an opponent color domain image;
separating said first image into separate ones of a luminance channel and a chrominance channel;
filtering said chrominance channel; and
combining said luminance, and chrominance channel into a filtered opponent color domain image.
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Abstract
Embodiments of the present invention provide systems and methods for converting an achromatic, higher-resolution image to a lower-resolution image with reduced visible errors. These systems and methods comprise a sub-pixel sampling performed on a higher-resolution image. The sub-pixel sampled image is then converted to an opponent color domain image that is separated into separate luminance and chrominance channels. These chrominance channels are then high-pass filtered and combined with the luminance channel to form a filtered opponent color domain image.
16 Citations
20 Claims
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1. A method for converting a first image of a first resolution to a second image of a second resolution, with reduced visible errors, said method comprising the acts of:
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performing sub-pixel sampling on said first image; converting said first image into an opponent color domain image; separating said first image into separate ones of a luminance channel and a chrominance channel; filtering said chrominance channel; and combining said luminance, and chrominance channel into a filtered opponent color domain image. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for removing artifacts created through sub-pixel sampling of an image, said method comprising the acts of:
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performing sub-pixel sampling on said image; transforming said image into an opponent color domain image with a segregated luminance channel and a chrominance channel; filtering said chrominance channel to remove low frequencies thereby creating a filtered chrominance channel; and combining said luminance channel and said filtered chrominance channel thereby creating a filtered opponent color domain image. - View Dependent Claims (9, 10)
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11. A method for converting a first image to a second image having a lower resolution than said first image, with reduced visible errors, said method comprising:
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copying said first image into separate color channels; filtering said separate channels;
combining said filtered channels into a filtered additive color domain image;
performing sub-pixel sampling on said filtered additive color domain image;
converting said sampled and filtered additive color domain image into an opponent color domain image;
dividing said opponent color domain image into separate ones of a luminance and a chrominance channel;
filtering said chrominance channel; and
combining said luminance and said filtered chrominance channel into a filtered opponent color domain image. - View Dependent Claims (12)
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13. A method for converting a first image to a second image with reduced visible errors, said method comprising the acts of:
- filtering said separate channels;
dividing said first image into separate R, G and B channels;
combining said filtered channels into a filtered RGB image;
performing sub-pixel sampling on said filtered RGB image;
converting said filtered RGB image into a YCbCr image;
dividing said YCbCr image into separate Y, Cb and Cr channels;
filtering said Cb and Cr channels; andcombining said Y, and said filtered Cb and filtered Cr channels into a filtered YCbCr image. - View Dependent Claims (14, 15)
- filtering said separate channels;
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16. A method for converting a first image to a second image with reduced visible errors, said method comprising:
- separating said first image into separate color channels;
filtering said separate channels;
combining said filtered channels into a filtered additive color domain image;
sub-pixel sampling said filtered additive color domain image;
converting said sampled and filtered additive color domain image into an opponent color domain image;
dividing said opponent color domain image into separate ones of a luminance and a chrominance channel;
filtering said chrominance channel and combining said luminance and said filtered chrominance channel into a filtered opponent color domain image. - View Dependent Claims (17)
- separating said first image into separate color channels;
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18. A system for converting a first image to a second image with reduced visible errors, said system comprising:
- a first copier for copying said first image into separate color channels;
a filter for filtering said separate channels;
a first combiner for combining said filtered channels into a filtered additive color domain image;
a sampler for performing sub-pixel sampling on said filtered additive color domain image;
a converter for converting said sampled and filtered additive color domain image into an opponent color domain image;a second divider for dividing said opponent color domain image into separate ones of a luminance channel and a chrominance channel;
a second filter for filtering said chrominance channel a second combiner for combining said luminance, and said filtered chrominance channel into a filtered opponent color domain image.
- a first copier for copying said first image into separate color channels;
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19. A computer readable medium comprising instructions for converting a first image to a lower resolution second image with reduced errors, said instructions comprising the acts of:
- separating said first image into separate color channels;
filtering said separate channels;
combining said filtered channels into a filtered additive color domain image;performing sub-pixel sampling on said filtered additive color domain image;
converting said sampled and filtered additive color domain image into an opponent color domain image;dividing said opponent color domain image into separate ones of a luminance and a chrominance channel;
filtering said chrominance channel; andcombining said luminance, and said filtered chrominance channel into a filtered opponent color domain image.
- separating said first image into separate color channels;
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20. A computer readable medium comprising instructions for converting a first image to a second image, said signal comprising instructions for:
- copying said first image into separate color channels;
filtering said separate channels;combining said filtered channels into a filtered additive color domain image;
performing sub-pixel sampling on said filtered additive color domain image;
converting said sampled and filtered additive color domain image into an opponent color domain image;
dividing said opponent color domain image into separate ones of a luminance channel and a chrominance channel;
filtering said chrominance channel combining said luminance, and said filtered chrominance channel into a filtered opponent color domain image.
- copying said first image into separate color channels;
Specification