Image scanning signal generating apparatus with pre-scan for exposure control
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United States of America Patent
Stats
-
Mar 17, 1987
Grant Date -
N/A
app pub date -
Oct 17, 1984
filing date -
Oct 24, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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