Color image sensing apparatus with one non-feedback clamp circui

Details Color image sensing apparatus with one non-feedback clamp circui Color image sensing apparatus with one non-feedback clamp circui

1985-01-24

1987-07-21

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 34, 358 40, 358 43, 358 50, H04N 904, H04N 907, H04N 909, H04N 964

Patent

active

046822119

ABSTRACT:
An image sensing apparatus including an image sensor for converting light representing an optical image to an image signal; processing circuits for processing R, G and B component signals of the image signal; a non-feedback clamp circuit for clamping the G component signal to a fixed reference level; two feedback clamp circuits for clamping the R and B component signals to levels determined on the basis of the levels of the processed clamped R and B component signals, respectively; and an automatic exposure controller for controlling the amount of light incident on the image sensor in accordance with the level of the clamped processed G component signal. The apparatus decreases the time it takes for the automatic exposure controller to respond when the apparatus is first turned on.

REFERENCES:
patent: 4473839 (1984-09-01), Noda

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