Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-12-04
1991-05-28
Peng, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358141, 358 11, 358 12, H04N 701, H04N 704, H04N 1120, H04N 1106
Patent
active
050199048
ABSTRACT:
A television scan conversion method receives and stores incoming pixel bits are stored in a pixel memory array at a first scan rate. Vertical columns of adjacent pixel bits of plural scan lines from the pixel memory array are read out at a second scan rate. A filter coefficient is generated by detecting a bit pattern located in each vertical column of pixel bits retrieved from the pixel memory array. Delay matched predetermined adjacent groups of pixel bits in each vertical column are adaptively low pass filtered in response to the filter coefficient so as to minimize video flicker artifacts in a resultant stream of interpolation pixels in accordance with the bit patterns detected by the pattern recognition filter coefficient generator. An interpolation coefficient is generated for each interpolation pixel, and plural-bit interpolation pixels are put out as a stream at the second scan rate.
REFERENCES:
patent: 4698674 (1987-10-01), Bloom
patent: 4837619 (1989-06-01), Tsinberg
patent: 4891701 (1990-01-01), Shekima et al.
patent: 4937667 (1990-06-01), Choquet et al.
Harrison David B.
Peng John K.
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