ACCOUNT FOR CLIPPED PIXELS IN AUTO-FOCUS STATISTICS COLLECTION

摘要

An image processing pipeline may account for clipped pixels in auto focus statistics. Generating auto focus statistics may include evaluating a neighborhood of pixels with respect to a given pixel in a stream of pixels for an image. If a clipped pixel is identified within the neighborhood of pixels then the evaluation of the given pixel may be excluded from an auto focus statistic. The image processing pipeline may also provide auto focus statistics that do not exclude clipped pixels. A luminance edge detection value may, in some embodiments, be generated by applying an IIR filter to the given pixel in a stream of pixels to band-pass filter the given pixel before including the band-pass filtered pixel in the generation of the luminance edge detection value.

主权项

1. An apparatus, comprising:
an image sensor that collects image data; an image signal processor, configured to:
receive a stream of pixel data collected at the image sensor for an image frame;determine an edge detection value for the image frame, wherein the determination comprises:
evaluate respective neighborhoods of pixels for individual pixels in the stream of pixel data to determine the edge detection value; andfor at least one of the individual pixels:
detect a clipped pixel within the respective neighborhood; andexclude the evaluation of the at least one individual pixel from the edge detection value; andstore the edge detection value in a memory; and an automated controller, configured to:
access the memory to obtain the edge detection value; anddirect a focal adjustment at the image sensor based, at least in part, on the edge detection value.