Quantizing circuit

Details Quantizing circuit Quantizing circuit

1993-07-14

1995-01-31

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358448, 358455, 382 50, H04N 140

Patent

active

053863046

ABSTRACT:
A quantizing circuit is applied to a film scanner which is adapted to read image data from a negative or positive film, and the resultant film scanner is simple in arrangement, and is advantageous in that deterioration in picture quality of the output image can be prevented, and the adjustment operation for gamma correction can be simplified. In such a quantizing circuit, an analog-to-digital conversion circuit converts an input signal into a first digital signal D1 having a predetermined first bit length, and a digital signal processing circuit converts the first digital signal into a second digital signal whose bit length is smaller in the number of bits than the first bit length. In this case, the first digital signal is converted into the second digital signal based on detected maximum, minimum and average values of the second digital signal during a preview scan.

REFERENCES:
patent: 5148289 (1992-09-01), Nishiyama et al.
patent: 5210600 (1993-05-01), Hirata
patent: 5315408 (1994-05-01), Kawahara et al.

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