05093721 is referenced by 38 patents and cites 6 patents.

A video system includes a scan converter for developing a progressively scanned display of video lines from a two field interlaced line system. A spatial array of six pixels covering two successive video lines is developed and gradients are determined between diagonally opposed pairs of pixels and a vertically opposed pair of pixels in the array. The interpolated pixel is developed by averaging the two pixels in the smallest of the gradients. A non-orthogonal display is developed by using horizontally interpolated pixels in the array developed by averaging successive pairs of real pixels, which introduces an offset of one-half pixel duration to the interpolated pixels. An adaptive peaking and noise coring circuit is included. Another spatial array of three line of pixels, both real and interpolated, is developed and a horizontal, a vertical and two diagonal gradients between pairs of pixels in the array are calculated. Logic circuitry and a maximum value decoder determine a peaking factor based upon the maximum gradient. A simplified adjustable noise coring circuit with symmetrical and asymmetrical peaking is also disclosed.

Title
Line interpolator with preservation of diagonal resolution
Application Number
7/550605
Publication Number
5093721
Application Date
July 10, 1990
Publication Date
March 3, 1992
Inventor
Khosro M Rabii
Arlington Heights
IL, US
Assignee
Zenith Electronics Corporation
IL, US
IPC
H04N 11/06
H04N 7/04
H04N 7/01
H04N 7/12
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