PIXEL DEFECT PREPROCESSING IN AN IMAGE SIGNAL PROCESSOR

摘要

An image signal processor may include a sensor interface that includes a pixel defect preprocessing (PDP) component that performs an initial adjustment of pixel values for patterned defect pixels in raw pixel data captured by an image sensor. To adjust a patterned defect pixel, the PDP component may apply an interpolation technique to values in a gain lookup table according to the pixel's location in the image frame to determine the gain value for the pixel, and then apply the gain value to the pixel. The PDP component may provide the raw pixel data with the adjusted patterned defect pixels to two or more other modules for additional processing. The other modules may include an image processing pipeline that may detect other defective pixels in the raw pixel data and correct the patterned defect pixels and the other defective pixels, for example using a weighted combination of neighboring pixels.

主权项

1. An apparatus, comprising:
an image sensor configured to capture images as a plurality of pixels; an image signal processor comprising a sensor interface, the sensor interface configured to:
receive a stream of raw pixel data collected by an image sensor;determine patterned defect pixels in the stream of raw pixel data, wherein the patterned defect pixels are pixels on the image sensor that are partially shielded by the image sensor;determine gain values for the patterned defect pixels in the stream;adjust the values of the patterned defect pixels according to the determined gain values; andprovide the stream of raw pixel data with the adjusted values of the patterned defect pixels to other modules for additional processing.