Digital Imaging Systems Gmbh

Giuseppe D'onofrio

Mark Nussbächer

An improved method for photon transfer curve (PTC) testing in an image sensor is described. A cost and time savings is achieved by reducing the number of frames necessary for measurements to two that are generated by illuminating a first plurality of pixel rows at a first intensity level m, a second plurality of pixel rows at a second intensity level t, and so forth up to an nth plurality of pixel rows illuminated at an nth intensity level mwhere m&#x3e;m&#x3e;m. The resulting image has 'n' regions each with a different brightness. The highest intensity level essentially saturates the pixels in the nth region. In one example, a four row exposure and five intensity levels are employed in the illuminator sequence. An intelligent light source is pre-programmable with illumination intensity settings and is synchronized to the image sensor using HSYNC and VSYNC signals, for example.

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Boise, ID, United States of America

Giuseppe D'onofrio