Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-08-30
1992-01-14
Peng, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358140, 358135, H04N 718, H04N 701, H04N 712
Patent
active
050815326
ABSTRACT:
A video system includes a scan converter for developing a progressively scanned display of video lines from a two field interlaced line system. Three video pixels are simultaneously supplied to a motion detector and a three dimension interpolator, the pixels corresponding to the pixel from the line above and the line below the pixel to be interpolated and to the corresponding pixel from the previous field. A motion coefficient for each interpolated pixel is stored in a field memory and the coefficient determined for the previous field interpolated pixel is consulted in developing motion factors for controlling multipliers in the three dimension interpolator. The interpolated pixel may thus be any porportion of the pixels on the line above, the line below and the previous field. An adaptive peaking and noise coring circuit is included. A spatial array of three lines of pixels, both real and interpolated, is developed and a horizontal, a vertical and two diagonal gradients between pair 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 shown.
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Peng John K.
Zenith Electronics Corporation
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