Edge detection and sharpening process for an image
First Claim
1. A method of compensating for distortion at an edge of an image during image processing, said method comprising:
- detecting the edge in the image; and
sharpening the detected edge, wherein the degree of sharpening is directly proportional to a degree of distortion in the image.
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Accused Products
Abstract
A method and device for sharpening detected edges in an image to compensate for a corruption that occurs during the scanning and printing processes. Edges are enhanced by increasing the contrast between two sides of an edge region according to the amount of distortion in the image signal at that location. Each pixel in the image is analyzed in the context of neighboring pixels in the image to determine the presence of an edge and the degree of sharpening required. A filter is applied to adjust the intensity value of pixels in an edge region to correct for distortion and to emphasize the edge. The resulting final image contains sharpened edges with little effect on the smooth transition regions of the image.
80 Citations
42 Claims
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1. A method of compensating for distortion at an edge of an image during image processing, said method comprising:
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detecting the edge in the image; and sharpening the detected edge, wherein the degree of sharpening is directly proportional to a degree of distortion in the image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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11. An electronic device comprising:
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a scanner for scanning an original image and converting the image into a digital image signal comprised of pixels having an intensity value that ranges from a minimum intensity to a maximum intensity; a printer for printing a copy of the original image onto a print medium by converting the image signal to a half-tone image using an error diffuser to sequentially process the pixels; a digital signal processor for processing the image signal after scanning and before printing, wherein said digital signal processor includes a filter for sharpening edges of the image in order to compensate for distortion of the edges that occurs during scanning and printing of the image. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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36. A method of compensating for distortion at an edge of an image during image processing, said method comprising:
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measuring an average intensity value of a first context of pixels adjacent to a first pixel in the image and an average intensity value of a second context of pixels adjacent to a second pixel in the image, wherein the first pixel and the second pixel are adjacent to each other; computing a difference value by subtracting the average intensity value of the first context from the average intensity value of the second context; determining whether the first pixel and the second pixel comprise an edge by examining the difference value; and when an edge is detected, sharpening the detected edge. - View Dependent Claims (37)
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38. A method of compensating for distortion at an edge of an image during image processing, said method comprising:
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detecting the edge in the image; and sharpening the detected edge by adjusting an intensity of pixel values near the edge, wherein the degree of sharpening is directly proportional to a degree of distortion in the image. - View Dependent Claims (39, 40, 41, 42)
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Specification