Oliff & Berridge, PLC
Black level correcting device and electronic camera
A black level correcting device includes: an A/D converting section converting a result of subtracting a feedback signal from an input pixel signal into a pixel value to be output; and a feedback controlling section generating the feedback signal and having a holding section, a feedback gain adjusting section, etc. The holding section clamps a maintaining level to the level of the feedback signal while pixel signals of OB pixels are output, and maintains and outputs the maintaining level while pixel signals of valid pixels are output. The feedback gain adjusting section multiplies the feedback signal by clamp accelerating gain in synchronization with starting readout of the pixel signals from the OB pixels. Accordingly, clamp time of the holding section is shortened, enabling stabilization of the maintaining level at a convergence level before starting readout of the pixel signals from the valid pixels. Consequently, a sag can be reduced.
Nikon Corporation
H H
H04N H04N
inventional inventional
Yoshizo
Mori