Adaptive scanning line converting circuit for a television recei

Details Adaptive scanning line converting circuit for a television recei Adaptive scanning line converting circuit for a television recei

1987-11-27

1989-05-16

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, 358160, H04N 701, H04N 514, H04N 521

Patent

active

048314358

ABSTRACT:
A circuit and technique for using only a line memory that has small capacity and selecting a proper interpolation filter according to the correlationship of vertical and slanting directions between two scanning lines of input signals. This system performs the steps of applying interlaced scanning signals to an image signal delaying circuit having delaying elements, generating a plurality of signals according to each delay, filtering in a two dimensional space filter, detecting the correlationship of the vertical and slanting directions between the lines by logic operations of the delay signal, selecting a proper space filter of the two dimensional space filter in response to the detected signal and converting in time axis with the interlaced scanning signals and a signal properly generated through the interpolation filter of a filter selector, thereby economically obtaining a high quality picture image.

REFERENCES:
patent: 4240113 (1980-12-01), Michael et al.
patent: 4551753 (1985-11-01), Nishiyawa et al.
patent: 4609941 (1986-09-01), Carr et al.
patent: 4677476 (1987-06-01), Kondo
patent: 4684985 (1987-08-01), Nakajaki et al.
patent: 4730217 (1988-03-01), Tonge et al.
patent: 4740842 (1988-04-01), Amegarn et al.

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