Method and apparatus for performing hierarchical super-resolution of an input image
First Claim
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1. A method for performing hierarchical super-resolution of an input image, comprising:
- dividing the input image into patches;
performing spatial decomposition of the input image to at least two lower decomposition levels, wherein at least two lower decomposition level images are obtained; and
for each current patch of the input image,searching in the lower decomposition level images one or more similar patches of same size as the current patch;
for each of the similar patches found in the searching, determining its respective parent patch in the next higher decomposition level, wherein the parent patches are larger than the current patch;
obtaining weighted determined parent patches using a weight determined from a sparsity of the patch, wherein the sparsity corresponds to a number of non-zero DCT coefficients in the patch;
accumulating the weighted determined parent patches to obtain an upsampled high-resolution patch; and
replacing an upsampled patch of an upsampled frame corresponding to the current patch with the upsampled high-resolution patch.
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Abstract
Super-resolution refers to a process of recovering the missing high-frequency details of a given low-resolution image. Known single image SR algorithms are often computationally intractable or unusable for most of the practical applications. The invention relates to a method for performing hierarchical super-resolution based on self content neighboring patches information is based on pyramidal decomposition. The intrinsic geometric property of an input LR patch neighborhood is obtained from the input LR patch and its K nearest neighbors taken from different down-scaled versions of the LR image.
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12 Claims
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1. A method for performing hierarchical super-resolution of an input image, comprising:
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dividing the input image into patches; performing spatial decomposition of the input image to at least two lower decomposition levels, wherein at least two lower decomposition level images are obtained; and for each current patch of the input image, searching in the lower decomposition level images one or more similar patches of same size as the current patch; for each of the similar patches found in the searching, determining its respective parent patch in the next higher decomposition level, wherein the parent patches are larger than the current patch; obtaining weighted determined parent patches using a weight determined from a sparsity of the patch, wherein the sparsity corresponds to a number of non-zero DCT coefficients in the patch; accumulating the weighted determined parent patches to obtain an upsampled high-resolution patch; and replacing an upsampled patch of an upsampled frame corresponding to the current patch with the upsampled high-resolution patch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for performing hierarchical super-resolution of an input image, wherein the input image is divided into patches, the apparatus comprising:
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a spatial decomposition unit for performing spatial decomposition of the input image to obtain at least two lower decomposition levels; and a processing unit adapted to, for each current patch of the input image, search, in a search unit, in the lower decomposition level images one or more similar patches of same size as the current patch;
for each of the similar patches found in the searching,determine in a parent patch determining unit its respective parent patch in the next higher decomposition level, wherein the parent patches are larger than the current patch; weight, in a weighting unit, the determined parent patches, wherein a weight used for weighting a patch is determined from a sparsity of the patch, wherein the sparsity corresponds to a number of non-zero DCT coefficients in the patch, and wherein weighted determined parent patches are obtained;
in an accumulation unit,accumulate the weighted determined parent patches to obtain an upsampled high-resolution patch; and replace, in an insertion unit, an upsampled patch of an upsampled frame corresponding to the current patch with the upsampled high-resolution patch. - View Dependent Claims (12)
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Specification