Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-11-13
1993-12-14
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358149, 358165, H04N 701
Patent
active
052708152
ABSTRACT:
Input analog image signals are converted to digital image signals and applied to a demodulation circuit and a synchronous circuit. In the demodulation circuit, the digital image signals are demodulated and then compressed by a compression circuit. In the synchronous circuit, the digital image signals are synchronously processed so as to output horizontal pulses in accordance with a horizontal synchronizing signal contained in the digital image signals and so as to output phase difference information denoting a timing difference between the output of a horizontal pulse and an interpolated crossing of the horizontal synchronizing signal across a synchronizing threshold. A boundary at an image portion and a mask portion of an output image signal is corrected so that the boundary is substantially free of jitter using the horizontal pulses and the phase difference information output by the synchronous circuit. In this manner, a smooth boundary is obtained at the image portion and mask portion of the final compressed image.
REFERENCES:
patent: 4015288 (1977-03-01), Ebihara et al.
patent: 4215376 (1980-07-01), Mach
patent: 4574302 (1986-03-01), MacKereth
patent: 4673979 (1987-06-01), Kobo et al.
patent: 4766495 (1988-08-01), Kobayashi et al.
Okumura Naoji
Sakashita Hirohiko
Groody James J.
Harvey David E.
Matsushita Electric - Industrial Co., Ltd.
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