Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-01-04
1985-09-10
Orsino, Jr., Joseph A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358135, H04N 712
Patent
active
045410127
ABSTRACT:
Video type information signals are compressed for transmission and reproduction by comparing corresponding blocks of time domain information signals from successive fields, converting a block of the time domain information signals to a transform domain signal represented by discrete cosine transform coefficients when the difference between the corresponding blocks exceeds a block difference threshold, and encoding the transform domain coefficients for transmission to a decoding site. Corresponding blocks of time domain information signals from successive fields are compared by storing the successive fields in memory on a pixel by pixel basis, retrieving each block on a pixel by pixel basis, forming the difference between corresponding pixels from the successive blocks, squaring the resulting difference signal, summing the squares and dividing by the number of pixels per block. Successive fields are merged by weighted summing of corresponding pixels.
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Compression Labs, Inc.
Orsino Jr. Joseph A.
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