Smear correcting circuit of solid state image pickup element

Abstract

Abstract PURPOSE:To prevent color balance from being varied, by supplying an output signal of a solid state image pickup element to a level comparator, and reducing a correcting quantity of a smear correction or stopping its correction, in a non- linear area, by its output. CONSTITUTION:An output signal from a solid state image pickup element is digitized and supplied to a comparator 18. As for a switching circuit 20, its state is controlled by an output of the comparator 18. The comparator 18 compares an image pickup output from an A/D converter 15 with a reference level from a terminal 22, and when the image pickup output does not exceed the reference level, the circuit 20 becomes a state for selecting an input terminal 21A, and when it exceeds, said circuit becomes a state for selecting an input terminal 21B. Accordingly, in the range where the image pickup output is smaller than the reference level, a smear signal is subtracted from the image pickup output and the smear correction is executed. Also, when said output becomes larger, a signal to a subtracting circuit 12 becomes ''0'', and the smear correction is not executed.

Inventors

• 👤 Katsuro Miyata
• 👤 宮田　克郎
• 👤 Takashi Asaida
• 👤 浅井田　貴

Bibliographic Details