System and method for enhancing the sharpness of a colour image
First Claim
Patent Images
1. An image display system, comprising:
- an image display device which is arranged to receive an image signal representing saturation levels of color components of an input color image and to display an output color image which is the same as the input color image in a general sense; and
edge location signaling means for signaling a location in the input color image where an edge is situated between two regions having a different image characteristic, said edge location signaling means being coupled to the image display device;
the image display device being arranged to produce locally, in a vicinity of said edge location, saturation levels of color components of the output color image which are different from the saturation levels of said color components of the input color image in said vicinity;
characterized in that the image display device is arranged to produce locally, in the vicinity of said edge location and at both sides thereof, saturation levels of said color components of the output color image which are reduced below the saturation levels of said color components in the input color image, regardless of the color of said color components in the input color image.
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Abstract
A color image is locally discoloured in the vicinity of edges. The edges extend, for example, between a superposed foreground and a background in a computer-generated image, but also between different regions in natural images which are processed, for example, in a television receiver. Consequently, the edges are perceived as being sharper upon display.
20 Citations
10 Claims
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1. An image display system, comprising:
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an image display device which is arranged to receive an image signal representing saturation levels of color components of an input color image and to display an output color image which is the same as the input color image in a general sense; and edge location signaling means for signaling a location in the input color image where an edge is situated between two regions having a different image characteristic, said edge location signaling means being coupled to the image display device; the image display device being arranged to produce locally, in a vicinity of said edge location, saturation levels of color components of the output color image which are different from the saturation levels of said color components of the input color image in said vicinity; characterized in that the image display device is arranged to produce locally, in the vicinity of said edge location and at both sides thereof, saturation levels of said color components of the output color image which are reduced below the saturation levels of said color components in the input color image, regardless of the color of said color components in the input color image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of forming an image for display, said method comprising the following steps:
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receiving an input image signal representing saturation levels of color components of an input color image; signaling an edge location in the input color image where an edge is situated between two regions having a different image characteristic; and outputting an output image signal representing saturation levels of color components of an output color image which is the same as the input color image in a general sense but in which said color saturation levels are changed locally, in a vicinity of the edge location, relative to the input image; characterized in that in said vicinity of the edge location and at both sides thereof the saturation levels of said color components of the output image are reduced below the saturation levels of said color components of the input color image, regardless of the color produced by said color components in the input color image.
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Specification