초록 ▼

In a television camera including an imager of the field-transfer type having A, B and C registers, an indication signal representative of dark current response accompanying the video signal is generated by comparing first and second signals representative of charge packets derived from the B and C r

In a television camera including an imager of the field-transfer type having A, B and C registers, an indication signal representative of dark current response accompanying the video signal is generated by comparing first and second signals representative of charge packets derived from the B and C registers, respectively. Specifically, the first signal is generated when the C register supplies signals supplied from the B register which includes substantially no photo-responsive components transferred from the A register. The second signal is generated when the C register supplies signals after the signal supplied from the B register have already been read out and while no new signals from the B register are being transferred into the C register and therefore represents absolute black.

대표청구항 ▼

Apparatus for deriving a signal indicating the level of dark current accompanying a video signal supplied from a field-transfer type solid-state imager including A, B, and C registers, comprising: means for developing a first signal substantially representative of only dark current response accumula

Apparatus for deriving a signal indicating the level of dark current accompanying a video signal supplied from a field-transfer type solid-state imager including A, B, and C registers, comprising: means for developing a first signal substantially representative of only dark current response accumulated in a first portion of said imager; means for developing a second signal substantially representative of only dark current response accumulated in a second portion register of said imager, and means for comparing said first and second signals for developing said indicating signal.