Image scanning signal generating apparatus with pre-scan for exp

Details Image scanning signal generating apparatus with pre-scan for exp Image scanning signal generating apparatus with pre-scan for exp

1984-10-17

1987-03-17

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358228, 358288, 250229, 350269, H04N 110, H04N 304

Patent

active

046512268

ABSTRACT:
An image signal generating apparatus includes an optical system for focusing the image of a photographic film onto a predetermined plane and a scanning device for scanning the image with a photoreceptor positioned at the predetermined plane and generating output signals representing the light intensity distribution of the film. The scanning device performs a first scan of the image and a second scan of the image upon completion of the first scan. During the first scan the levels of the output signals indicative of the maximum density and the minimum density of the film are detected, and during the second scan the exposure of the photoreceptor is controlled in accordance with the detected levels. Also, during the second scan, the output signals are clamped to a clamp level calculated in accordance with the detected maximum density level and the minimum level of the output signals during the first scan.

REFERENCES:
patent: 3624291 (1971-11-01), Miyata
patent: 3804976 (1974-04-01), Gard
patent: 3931464 (1976-01-01), Murase
patent: 4158859 (1979-06-01), Kerbel
patent: 4255764 (1981-03-01), Howe

Affiliated with

Also associated with

Rating

Image scanning signal generating apparatus with pre-scan for exp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Image scanning signal generating apparatus with pre-scan for exp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image scanning signal generating apparatus with pre-scan for exp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1791647