Facsimile and static presentation processing – Facsimile – Reduced time or bandwidth for static image communication
Patent
1992-10-02
1995-01-03
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Reduced time or bandwidth for static image communication
358433, 348384, H04N 141
Patent
active
053791223
ABSTRACT:
A method of decompressing a document image compressed with JPEG ADCT or the like method of compression includes: a) receiving encoded quantized transform coefficient blocks for the original image; b) removing any lossless encoding of the quantized transform coefficient blocks for the original image; c) multiplying each quantized transform coefficient in a block by a corresponding quantizing value from the quantization table to obtain a block of received transform coefficients; d) recovering the image by applying an inverse transform operation to the received transform coefficients; e) reducing high frequency noise appearing in the recovered image as a result of the lossy quantization process, while preserving edges, whereby the appearance of the recovered image is rendered more visually appealing; f) changing the filtered recovered image into blocks of new transform coefficients by the forward transform coding operation using the frequency space transform compression operation; g) comparing each block of new transform coefficients to a corresponding block of received transform coefficients and the selected quantization table, to determine whether the filtered recovered image is derivable from the original image; and h) upon the determination transferring the filtered recovered image to an output buffer.
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Coles Sr. Edward L.
Costello Mark
Nguyen Madeleine
Xerox Corporation
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