Conversion of the scanning line count of television pictures

Details Conversion of the scanning line count of television pictures Conversion of the scanning line count of television pictures

1982-06-30

1985-01-29

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358180, 343 5SC, H04N 502

Patent

active

044969740

ABSTRACT:
Digitalized television signals of an entire picture field are stored and then are read out with a cross scanning of the lines of the picture field while the next picture field is stored in the memory in the memory cells vacated by cross scanning, thus in a different sequence of memory addresses. The cross scanned digital television signals are then subjected to low-pass filtering to provide output picture point signals at the rate of twice the filter cut-off frequency. If the picture format is to be changed, a sampling rate converter then restores the original sample rate and the digital signals are stored in a second picture field store from which a second cross read-out is made. Where no change of picture format is made the number of lines in the picture is changed in accordance with the setting of the filter cut-off and the related new sampling rate. When the picture format has been changed a vertically compressed picture bordered by black or a vertically expanded picture cut off at top or bottom or both is provided. In the latter two cases a second filtering and restoration of the sample rate is done to provide the same compression or expansion in the horizontal dimension of the picture.

REFERENCES:
patent: Re31460 (1983-12-01), Dalton et al.
patent: 4125862 (1978-11-01), Catano
patent: 4271476 (1981-06-01), Lotspiech
patent: 4310907 (1982-06-01), Tachita et al.
patent: 4432009 (1984-02-01), Reitmeier et al.
patent: 4449143 (1984-05-01), Dischert et al.

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