Camera head including an image pixel array and a preamplifier module
Disclosed herein is a camera system and camera controller having a modularized design. Camera control functions within the controller are distributed among a number of modules, each module performing a component task of controlling a camera. Individual modules can perform tasks such as generating clock signals, digitizing an analog video signal, and providing multiplexed digital video output. Modules communicate with each other over a common bus sufficient to carry the signals necessary to control the camera. The system implements a RAM-based digital sequencer that provides the capability of loading bit patterns into memory and using these patterns to generate waveforms for clocking a CCD. Clock and readout sequences can be composed in a high level language, compiled and uploaded into the controller. Adjustable clamp and sample signal delays used in digitizing an analog video signal provide the capability to optimize the performance of the system in a given application.
1. A method of controlling a camera head comprising:
a) storing integer data in a memory, the integer data indicating the number of times integration sequence pattern data is to be transmitted to an image pixel array in the camera head;
b) clocking out the integration sequence pattern data to the image pixel array, the image pixel array being exposed to a light source and accumulating electrons while receiving the integration sequence pattern data;
c) decrementing the integer data in the memory upon the completion of the clocking out of the integration sequence pattern data; and
d) returning to step (b) if the integer data in the memory is not zero.
2. The method of claim 1 wherein the integration pattern data transmitted to the image pixel array controls the image pixel array to empty an internal register, said internal register not containing the accumulating electrons of step (b).
3. The method of claim 1 further comprising:
e) reading image data from the image pixel array corresponding to the number of electrons accumulated in step (b).