Method for increasing resolution in a compatible television system
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United States of America Patent
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Dec 15, 1987
Grant Date -
N/A
app pub date -
Sep 24, 1985
filing date -
Sep 26, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for increasing image resolution in a compatible television system, in which system an optical image is scanned along vertically spaced horizontal raster lines by a high definition television camera, the resulting picture signal is subjected to a horizontal frequency band limitation for transmission over a transmission channel having a given bandwidth. The method includes: sampling the resulting picture signal in the direction of horizontal frequencies in the spatial domain with a horizontal sample spacing corresponding to the vertical spacing between adjacent lines of the resulting picture signal; effecting two-dimensional filtering of the sampled picture signal with respect to two mutually transverse diagonals of the scanned image; offset modulating the filtered picture signal and band limiting the filtered picture signal to the bandwidth of the transmission channel, to produce a modified picture signal containing components capable of causing interference in a compatible receiver; and imparting to the components capable of causing interference a relatively reduced amplitude.
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