IMAGING SYSTEMS WITH PIXEL ARRAY VERIFICATION CIRCUITRY

摘要

An imaging system may include an array of image pixels and verification circuitry. The verification circuitry may inject test voltages into the image pixel array during the photodiode reset operation. The test signals may then be read out using a correlated double sampling operation. Verification circuitry may compare the test signals to reference data to determine whether the imaging system is functioning properly (e.g., to determine whether the array of image pixels satisfies performance criteria). If the amount of mismatch between the test signals and the reference data exceed a predetermined threshold, the imaging system may be disabled and/or a warning signal may be presented to a user of the system.

主权项

1. A method of operating an imaging system having an image sensor that includes an array of image pixels, comprising:
loading a test image into the array; reading out the test image from the array; and comparing the test image that has been read out from the array to a reference image to determine whether the array of image pixels satisfies performance criteria.