Magnification/demagnification apparatus and method

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358 77, 358287, G06F 1520, H04N 104

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active

042754500

ABSTRACT:
Apparatus and method to permit selective variation in the size of the output image derived from digital image signals. A Reduction Ratio register is pre-programmed to a count reflecting the image size desired with a Threshold register set to the desired threshold count. The count from the Reduction Ratio register is input to an Accumulator and summed with the count left over from processing the previous image signals. The Accumulator count and the Threshold count are compared. Where the Accumulator count exceeds the Threshold count, the image signal in process is passed on. Where the Accumulator count is less than the Threshold count, the image signal is deleted and the count from an Additive Reset register is added to the Accumulator.
In an alternate embodiment, a Counter is set to the magnification ratio integer number and pulses a control gate astride the stream of image signals according to the Counter setting to generate additional image signals. An Add-one circuit responds to an Accumulator/Threshold register comparison to temporarily increase the setting of the Counter by one.

REFERENCES:
patent: 3541245 (1970-11-01), Wilby
patent: 3604846 (1971-09-01), Behane et al.
patent: 3716794 (1973-02-01), Teggatz et al.
patent: 3828169 (1974-08-01), Fluet
patent: 3976945 (1976-08-01), Cox
patent: 3976982 (1976-08-01), Eiselen
patent: 4075663 (1978-02-01), Wellendorf
patent: 4163605 (1979-08-01), Yamada

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