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US 8,620,073 B2Granted
Upscaling natural images
AssigneeMitsubishi Electric Research Laboratories, Inc.
InventorsOncel Tuzel, Fatih Porikli, Chinmay Hegde
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Abstract
A natural input image is upscaled, first by interpolation. Second, edges in the interpolated image are sharpened by a lion-parametric patch transform. The result is decomposed into an edge layer and a detail layer. Only pixels in the detail layer enhanced, and the enhanced detail layer is merged with the edge layer to produce a high resolution version of the input image.
Claims19
A method for upscaling an input image, comprising tile steps off interpolating the input image to produce a first intermediate image;
- sharpening edges in the first intermediate by replacing patches of pixels with a combination of reference patches to obtain a second intermediate image;
- decomposing tile second intermediate image into an edge layer and a detail layer;
- enhancing the detail layer using a mapping function to produce an enhanced detail layer;
- and
- merging the edge layer and tile enhanced detail layer to produce an output image at a larger resolution than the input image, wherein the steps are performed in a processor;
- (1−α){tilde over (I)}+α∫({tilde over (D)})=ε({tilde over (I)}),
- wherein Ĩ is the first intermediate image, α is a blending factor during the merging, ƒ is the mapping function, {tilde over (D)} is the enhanced detail layer, and ε is an overall detail-enhancement operator.
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