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Image display method, gradation conversion circuit, and image signal conversion apparatus

  • US 6,266,102 B1
  • Filed: 09/23/1996
  • Issued: 07/24/2001
  • Est. Priority Date: 09/25/1995
  • Status: Expired due to Term
First Claim
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1. An image display method for improving contrast in television images by displaying a television image by different gradation conversion in every pixel comprising the steps of:

  • extracting an edge of luminance of the image to obtain an edge of the image, carrying out gradation conversion on the basis of gradation luminance frequency distribution of pixels near the edge of the image, counting gradation luminance frequency of the pixels near the edge of the image, and while counting gradation luminance frequency of pixels near the image edge, weighting said counting of gradation luminance frequency depending on the coordinate values of each pixel so as to a eliminate relative contrast drop in a central part of the image with respect to peripheral parts of the image.

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