Adaptive slant range compensator for a remote optical mapping sy

Details Adaptive slant range compensator for a remote optical mapping sy Adaptive slant range compensator for a remote optical mapping sy

1978-12-18

1981-05-26

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358109, H04N 718

Patent

active

042701422

ABSTRACT:
An adaptive slant range compensator, suitable for use with an optical mapg system for remote viewing, comprises a logarithmic amplifier which compresses an analog input signal having a wide range of values to a tractable range. An analog-to-digital (A/D) converter converts the compressed signal to a 10-bit binary number. The digitized compressed data is then used to address antilog programmable read-only memories (PROMs) which contain the antilog of the address data in scientific notation. Control and data processing circuits are used to accumulate sample scans from the antilog PROMs in a summing memory, calculate an average scan from the accumulated sample scans, and transfer this average to a working memory. The data stored in the working memory is used to drive an attenuation/amplification network that divides succeeding scans by the stored average scan. In this way, the inverse transfer function is applied to the analog input signal, which forms another input to the attenuation/amplification network.

REFERENCES:
patent: 3316348 (1967-04-01), Hufnagel et al.
patent: 3463070 (1969-08-01), Miller et al.
patent: 3676581 (1972-07-01), Swet
patent: 3775735 (1973-11-01), Funk et al.

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