Automatic, self-diagnosing, electro-optical imaging system

Details Automatic, self-diagnosing, electro-optical imaging system Automatic, self-diagnosing, electro-optical imaging system

H - Electricity

04

N

350/1

H04N 7/18 (2006.01) G06F 11/22 (2006.01) H04N 5/217 (2006.01) H04N 17/00 (2006.01)

Patent

CA 1204500

-37- AUTOMATIC, SELF-DIAGNOSING, ELECTRO-OPTICAL IMAGING SYSTEM Abstract of the Disclosure An electro-optical imaging system is disclosed which automatically self-diagnoses the operations of its photosensor and its video processing circuitry during each of first and second modes of operation of a proces- sor, when no object is being imaged. In a preferred embodiment, a power supply is controlled by the proces- sor to prevent a light source from illuminating a refer- ence background during the first mode of operation and to enable the light source to illuminate the reference background during the second mode of operation. The photosensor sequentially develops first and second signals respectively proportional to the intensity of reflected light received from the reference background during the first and second modes of operation. The video processing circuitry is responsive to the first and second signals for sequentially developing respec- tive first and second data signals. A first circuit is responsive to the first and second signals for sequen- tially developing first and second test signals respec- tively proportional to the average values of respective portions of the first and second signals. A second circuit is responsive to the first and second data signals for sequentially developing third and fourth test signals respectively representative of predeter- mined portions of the first and second data signals. The processor is selectively responsive to the first, second, third and fourth test signals for automatically testing the operation of each of the photosensor and video processing circuitry during each of the first and second modes of operation.

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