Amorphous silicon four quadrant orientation detector (FOQUOD) for application to neural network image sensors

An a-Si:H orientation detector is presented which can extract both the position and the orientation of an edge passing through it. It is sensitive to half plane, thin line, and even gradient contrast with preferential orientation, and the output signal is independent of the illumination level and the position of the edge in the device area. The device structure is described and experimental results are presented.<
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