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US 8,554,005 B1Granted
Digital image enhancement method and system that embolden or thin image features
AssigneeHewlett-Packard Development Company, L.P.
InventorPeter Majewicz
Life of this patent
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Abstract
A method and system of digital image enhancement provide controllable emboldening and thinning of image features. The method includes providing an input image, creating an edge map image from the input image, and combining the edge map image with the input image using local clamping to produce an output image. Features of the output image are one of emboldened and thinned.
Claims15
A method of digital image enhancement, the method comprising:
- creating an edge map image from an input image using a processor;
- and
- combining the edge map image with the input image using local clamping to produce an output image having features that are one of emboldened and thinned,
- wherein local clamping limits a value of a central pixel based on a value of a pixel in a local vicinity of the central pixel and wherein the output image is one or more of stored in a memory, displayed to a user, passed to another image processing operation and transmitted over a communication channel.
1 more element
A method of digital image enhancement, the method comprising:
- convolving an input image G with an edge detection kernel to produce an edge map image G3 using a processor;
- adding the edge map image G3 to the input image G to produce a summed image G4 using the processor;
- and
- clamping a value of a pixel G5i,j in an output image G5 to be between a local maximum value Mi,j and a local minimum value Ni,j of pixels in a local neighborhood of a corresponding pixel Gi,j in the input image G, wherein clamping a value is implemented according to:
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- where G4i,j is a pixel value of the summed image G4 that corresponds to the pixel G5i,j, the output image G5 having features that are one of emboldened and thinned,
- wherein the output image G5 is one or more of stored in a memory, displayed to a user, passed to another image processing operation and transmitted over a communication channel.
54 more elements
A digital image enhancement system comprising:
- a processor;
- a memory;
- and
- a computer program stored in the memory, the computer program having instructions that, when executed by the processor, implement creating an edge map image of an image input to the system, and combining the edge map image with the input image using local clamping to produce an output image,
- wherein using local clamping constrains a value of each pixel in the output image to be less than a local maximum value M and greater than a local minimum value N of a local neighborhood surrounding a corresponding pixel in the input image.
2 more elements
Dependencies are inferred from the claim text.