device for reading detektorzeilen in one or two-dimensional arrangement

摘要

An image readout device is constructed to read out a partial image from a total image stored in photo detectors arranged in at least one row or two-dimensionally in rows and columns. The partial image may be of interest for a particular purpose, for example for the identification of a target, which does not require the processing of all the data representing the total image. The readout is accomplished by a series of switches arranged in a row and controlled by two shift registers in response to shift clock pulses. A logical "high (1)" state is loaded into a first shift register position (A) corresponding to the first detector position to be read out. All other shift register positions are loaded with the logical "low (0)" state. These logical states are then shifted in parallel into another second shift register which addresses the row of switches in a serial manner. A predetermined number of shift clock pulses determines the shift of the logical "high (1)" state from the first position (A) to a second position (B). These positions (A, B) determine the beginning and the end of the partial image readout of a row of photocells for example. The output signal at the output of the row of switches is provided only for those positions or locations which are determined by the shifting logical "high (1) " state. No output signal is provided for positions in the logical "low (0)" state. Thus the data flow and correspondingly the software and hardware have been substantially reduced.