Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-06-02
1988-10-25
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358138, H04N 7133
Patent
active
047807610
ABSTRACT:
A system for compressing and transmitting a digital image signal over a limited bandwidth communication channel, transform codes the image values and quantizes the transform coefficients according to a two-dimensional model of the sensitivity of the human visual system. The model of the human visual system is characterized by being less sensitive to diagonally oriented spatial frequencies than to horizontally or vertically oriented spatial frequencies, thereby achieving increased compression of the image.
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Chen Cheng-Tie
Daly Scott J.
Rabbani Majid
Britton Howard W.
Close Thomas H.
Eastman Kodak Company
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