Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-03-19
1987-10-27
Goldberg, E. A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358260, 364726, 382 43, 382 56, H04N 712, H04N 140, G06F 734, G06F 15332
Patent
active
047033495
ABSTRACT:
A method and apparatus for representing a multi-dimensional, finite extent, information containing signal in a locally sensitive, frequency domain representation employs transforming the digital signal using a Short-Space Fourier transform having overlapping basis functions. The theory and application of the Short-Space Fourier transform provide, in one particular application of picture image transmission, an improved image quality over previously employed block transform coding methods and apparatus. A particularly preferred window function for use in connection with image signal processing is the multi-dimensional sinc function which has the unique advantage of a rectangular bandpass signal in the frequency domain.
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Foster Patrick W.
Goldberg E. A.
PictureTel Corporation
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