Patent ID: 7948532

Claim:
A solid-state image-pickup device signal processing apparatus comprising: a solid-state image-pickup device, an amplifier for amplifying an output signal of said solid-state image-pickup device, an A/D conversion circuit for converting an analog output signal of said amplifier to a digital signal, a digital correlated double sampling circuit for removing noises, and a means for adding optional-value direct current signals to video signal portions of digital output signals of said A/D conversion circuit, each of said optional-value direct current signals corresponding to a picture element from the solid state image-pickup device and being set to an optional-value direct current signal level and digitized, wherein said digital correlated double sampling circuit subtracts a field-through portion of said digital output signal from said video signal portion including said optional-value direct current signal so that said optional-value direct current signal remains after subtracting said field-through portion from said video signal portion including said optional-value direct current signal when said solid-state image-pickup device image-picks up a dark space.