Patent ID: 7184084

Claim:
A method for producing electronic video signals representative of a focused moveable image, comprising the steps of: providing a charge coupled sensor device, and masking substantially less than half of the lines of said device to form a masked storage area and a substantially larger unmasked sensing area; disposing said sensing area in the path of said image; providing a shutter for periodically blocking said image from said sensing area; and providing a first vertical clock, a second vertical clock, and a pixel rate clock; said first vertical clock being operative to shift lines in the sensing area, said second vertical clock being operative to shift lines in the storage area, and said pixel rate clock being operative to clock out pixels from the storage area; wherein, during a vertical blanking period after shutter closure, lines are shifted from the sensing area to fill the storage area using said first and second vertical clocks at relatively high speed and during the remainder of said shutter closure time further lines are shifted from the sensing area to the storage area and lines are shifted through the storage area and clocked out using said first and second vertical clocks at relatively low speed, and after shutter opening, lines in the storage area are clocked out using said second vertical clock at a relatively low speed.