Patent ID: 9398205
Filing Date: 2016-07-19
CPC Classification: G03B,H04N

Claim Text:
1. An image signal processing system comprising: a front-end pixel processing unit configured to receive a frame of raw image data comprising pixels acquired using an imaging device having a digital image sensor, wherein the front-end pixel processing unit comprises a statistics collection engine having auto-focus statistics logic configured to process the raw image data to collect coarse auto-focus statistics and fine auto-focus statistics, the coarse auto-focus statistics based at least in part on down-scaled image data relating to the raw image data, wherein the down-scaled image data comprises image data reduced in size by a down-scale ratio, and the fine auto-focus statistics based at least in part on the raw image data; and control logic configured to determine an optimal focal position of a lens of the imaging device using coarse auto-focus scores based upon the coarse auto-focus statistics and fine auto-focus scores based upon the coarse and fine auto-focus statistics and to adjust the focal position of the lens between a minimum position and a maximum position defining a total focal length to reach the optimal focal position based at least in part upon the coarse auto-focus scores and the fine auto-focus scores.