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| United States Patent | 5502576 |
| Link to this page | http://www.wikipatents.com/5502576.html |
| Inventor(s) | Ramsay; Thomas E. (Minneapolis, MN), Elkins; James C. (Golden Valley, MN) |
| Abstract | A method and apparatus for high speed conversion of tangible source
documents to electronic images, and subsequent transmission or storage and
retrieval of images, utilizing hybrid signal processing. The system
employs a higher bandwidth analog signal for image capture and lower
effective bandwidth analog signal for transmission or storage and
retrieval, with an intervening digital memory utilized to construct a
bitmap of the image to facilitate various dissection and seaming schemes
which optimize image content and processing time. The system is designed
around a conventional bus structure, and the memory serves as a junction
with conventional personal computers, networks, and peripheral devices. In
a representative embodiment, a tangible image is captured using a camera
producing an analog signal with conventional raster synchronization. The
synchronization is stripped from the analog signal, which is digitized for
8-bit grayscale and multiplexed to the memory where the image exists as a
bitmap that may be divided into segments. The content is read from the
memory, converted to an analog signal, and control signals are added. The
control signals include horizontal and vertical sync pulses and interval
blanking, a pilot signal to maintain alignment between adjacent segments
along seams and to compensate for time-based errors, and calibration
pulses to permit instantaneous adjustment of the gray level for each line,
ensure accurate image content, and permit display enhancement. The
resultant analog signal is stored on a randomly accessible storage medium
as one or more frames, transmitted and reassembled, or displayed on a
conventional monitor. |
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Title Information  |
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Drawing from US Patent 5502576 |
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Method and apparatus for the transmission, storage, and retrieval of
documents in an electronic domain |
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| Publication Date |
March 26, 1996 |
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| Filing Date |
August 24, 1992 |
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Title Information |
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| | Reference | Relevancy | Comments | Four page brochure from Folsom Research on Video/Scan and CGCII.
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