Patent ID: 8922704

Claim:
An image signal processing system comprising: a front-end pixel processing unit configured to receive a frame of raw image data acquired using a digital image sensor, wherein the raw image data comprises raw Bayer RGB data, wherein the front-end pixel processing unit comprises a statistics collection engine having auto-focus (AF) statistics having fine resolution filtering logic configured to process the raw image data to provide fine resolution AF statistics and coarse resolution filtering logic configured to process the raw image data to provide coarse AF statistics, wherein the fine resolution filtering logic comprises a horizontal filter configured to apply filtering to each color component of the raw image data; and wherein the horizontal filter comprises a multi-tap filter configured to apply filtering to an input pixel of the raw image data, a first set of pixels having the same color as the input pixel and located horizontally on a first side of the input pixel, and a second set of pixels having the same color as the input pixel and located horizontally on a second side of the input pixel, wherein the number of pixels in the first and second set are equal.