System and method for comparison-based image quality assessment
First Claim
1. A system for automatically assessing and comparing quality of digital images, comprising:
- a memory storing instructions; and
a processor configured to execute the instructions to;
receive an input image;
receive a plurality of base images;
select at least one key image from the plurality of base images based on a minimum mean squared difference of each base image as compared to a predetermined threshold;
calculate overall comparative qualities between pairs of the input image and the at least one key image, the overall comparative qualities representing a weighted combination of comparative quality indices;
sort the input image and at least one key image by the overall comparative qualities between the pairs and determine the best key image, the best key image being a key image sorted highest by the overall comparative qualities; and
output at least one of;
the best key image as sorted by overall comparative quality or the overall comparative qualities,wherein overall comparative quality depends upon local gradient-based structure information, and the local gradient-based structure information depends upon differences between images being compared.
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Accused Products
Abstract
An image quality assessment and restoration system may include a processor and a memory storing instructions to receive an input image, receive a predetermined number of parameter candidates, generate a reconstructed image from the input image for each parameter candidate, sort the reconstructed images by the overall comparative quality between them and determine the best reconstructed image, calculate the overall comparative qualities between the remaining reconstructed images and the best reconstructed image, eliminate any parameter candidates that are suboptimal based on the calculated overall comparative quality, iteratively generate and sort additional reconstructed images and eliminate suboptimal parameter candidates until each of the remaining parameter candidates is converged, and output the converged parameters for use in image restoration. The overall comparative quality may depend upon the local gradient-based structure information and/or the global texture quality information.
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Citations
20 Claims
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1. A system for automatically assessing and comparing quality of digital images, comprising:
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a memory storing instructions; and a processor configured to execute the instructions to; receive an input image; receive a plurality of base images; select at least one key image from the plurality of base images based on a minimum mean squared difference of each base image as compared to a predetermined threshold; calculate overall comparative qualities between pairs of the input image and the at least one key image, the overall comparative qualities representing a weighted combination of comparative quality indices; sort the input image and at least one key image by the overall comparative qualities between the pairs and determine the best key image, the best key image being a key image sorted highest by the overall comparative qualities; and output at least one of;
the best key image as sorted by overall comparative quality or the overall comparative qualities,wherein overall comparative quality depends upon local gradient-based structure information, and the local gradient-based structure information depends upon differences between images being compared. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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2. A system for automatically assessing and restoring quality of a digital image, comprising:
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a memory storing instructions; and a processor configured to execute the instructions to; receive an input image; receive a predetermined number of parameter candidates; generate a reconstructed image from the input image for each parameter candidate; sort the reconstructed images by overall comparative qualities between pairs of the reconstructed images in the sorting, the overall comparative qualities representing a weighted combination of comparative quality indices, and determine the best reconstructed image, the best reconstructed image being a reconstructed image sorted highest by the overall comparative qualities; calculate the overall comparative qualities between each remaining reconstructed image and the best reconstructed image; eliminate any parameter candidates that are suboptimal based on the calculated overall comparative quality; iteratively generate and sort additional reconstructed images and eliminate suboptimal parameter candidates until each of the remaining parameter candidates is converged; and output at least one of;
the converged parameter candidates for use in image restoration or one or more reconstructed images whose parameter candidates converged,wherein overall comparative quality depends upon local gradient-based structure information, and the local gradient-based structure information depends upon differences between images being compared. - View Dependent Claims (10, 11, 12, 13)
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14. A method for automatically assessing and restoring quality of a digital image, comprising:
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receiving an input image; receiving a predetermined number of parameter candidates; generating a reconstructed image from the input image for each parameter candidate; sorting the reconstructed images by overall comparative qualities between pairs of the reconstructed images in the sorting, the overall comparative qualities representing a weighted combination of comparative quality indices, and determining the best reconstructed image, the best reconstructed image being a reconstructed image sorted highest by the overall comparative qualities; calculating the overall comparative qualities between each remaining reconstructed image and the best reconstructed image; eliminating any parameter candidates that are suboptimal based on the calculated overall comparative quality; iteratively generating and sorting additional reconstructed images and eliminate suboptimal parameter candidates until each of the remaining parameter candidates is converged; and outputting at least one of;
the converged parameter candidates for use in image restoration or one or more reconstructed images whose parameter candidates converged,wherein overall comparative quality depends upon local gradient-based structure information, and the local gradient-based structure information depends upon differences between images being compared. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification