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US 3,942,022 AGranted
Rapid response correlation type image motion sensor
AssigneeItek Corporation
InventorsKenneth D. Stumpf, John T. Watson
Life of this patent
Estimating the term…
Abstract
An improved system for detecting movement of an image formed by a reconnaissance optical system. A photodiode array is placed in the focal plane of the optical system to detect the image. The photodiode array is first read out at a time T into a shift register where the signal is stored. After passage of a time .DELTA.T the photodiode array is read out a second time. The first and second read out signals are then correlated to determine the amount of movement of the image between times T and T + .DELTA.T.
Claims3
A system for determining movement of a light pattern and comprising:
- a. an array of photodetectors;
- b. means for forming said light pattern on said array of photodetectors;
- c. means for reading out said array of photodetectors at a time T to obtain a first electrical signal indicative of the light pattern on the photodetector array at time T;
- d. means for reading out said photodetector array at a time T + .DELTA.T to obtain a second electrical signal indicative of the light pattern on the photodetector array at time T + .DELTA.T;
- and
- e. means for correlating said first electrical signal at time T with said second electrical signal at time T + .DELTA.T to determine relative time shift between the first and second signals, whereby the relative time shift between the signals is indicative of movement of the light pattern between time T and time T + .DELTA.T.
3 more elements
Dependencies are inferred from the claim text.