Phase detection autofocus noise reduction

摘要

Certain aspects relate to systems and techniques for using imaging pixels (that is, non-phase detection pixels) for performing noise reduction on phase detection autofocus. Advantageously, this can provide for more accurate phase detection autofocus and also to optimized processor usage for performing phase detection. The phase difference detection pixels are provided to obtain a phase difference detection signal indicating a shift direction (defocus direction) and a shift amount (defocus amount) of image focus, and analysis of imaging pixel values can be used to estimate a level of focus of an in-focus region of interest and to limit the identified phase difference accordingly.

主权项

1. An imaging apparatus comprising:
a plurality of diodes each configured to capture one of
image information representing a target scene, the image information received from a first subset of the plurality of diodes, orphase detection information, the phase detection information received from a second subset of the plurality of diodes; and a processor configured with instructions to
analyze the image information
identify a region of the image information that is more in-focus than another region of the image information, anddetermine a focus value of the region,identify a bounding phase difference value corresponding to the focus value,generate at least first and second images based on the phase detection information, anddetermine a phase difference between the first and second images, andcalculate an autofocus adjustment based at least partly on the determined phase difference and at least partly on a range defined by the bounding phase difference value.