Black level correction circuit and solid-state imaging device
AssigneeSony Corporation
InventorsHiroyuki Horikawa, Hiroki Ui
Life of this patent
Estimating the term…
Abstract
A black level correction circuit includes: a counter counting a black signal level of an image; a black level determination section determining a feedback gain by comparing data outputted from the counter with a previously set threshold; an average value calculation section calculating an average value from data supplied from the counter; a feedback calculation processing section selecting the feedback gain by a control signal supplied from the black level determination section and calculating the selected feedback gain and the averaged data; and a digital-analog converter correcting data to which feedback calculation processing has been performed and converting the corrected data into analog data to output an analog black signal.
Claims14
A black level correction circuit comprising:
- a counter counting a black signal level of an image;
- a black level determination section determining a feedback gain by comparing data outputted from the counter with a previously set threshold;
- an average value calculation section calculating an average value from data supplied from the counter;
- a feedback calculation processing section selecting the feedback gain by a control signal supplied from the black level determination section and calculating the selected feedback gain and the averaged data;
- and
- a digital-analog converter correcting data to which feedback calculation processing has been performed and converting the corrected data into analog data to output an analog black signal.
A solid-state imaging device comprising:
- a pixel section in which light detection units detecting light signals and converting the lights into electric signals are arranged in a matrix state, and the detected electric signals are outputted by horizontal and vertical drive circuits through column lines;
- comparators comparing electric signals supplied from the column lines with a ramp waveform to output comparison results;
- a counter counting a black signal level based on output signals from the comparators;
- a black level determination section determining a feedback gain by comparing data outputted from the counter with a previously set threshold;
- an average value calculation section calculating an average value from data supplied from the counter;
- a feedback calculation processing section selecting the feedback gain by a control signal supplied from the black level determination section and calculating the selected feedback gain and the averaged data;
- and
- a digital-analog converter correcting data to which feedback calculation processing has been performed and converting the corrected data into analog data to output an analog black signal.
Dependencies are inferred from the claim text.