Patent ID: 8194159
Filing Date: 2012-06-05
Classification: H01L,H04N

Abstract:
1. An image sensing system, comprising: a lens shading correction module to correct a gain of each pixel of a captured image for optical shading effects, the lens shading correction module storing a two-dimensional correction surface in which an image sensor is partitioned into at least three sections in an x-dimension and at least three sections in a y-dimension to form at least nine different rectangular-shaped zones with each zone having a first piecewise continuous quadratic polynomial correction curve in an x-dimension and a second piecewise continuous quadratic polynomial correction curve in a y-dimension, the number of zones being selected to achieve accurate shading correction of both a center portion of the image and edge portions of the image; wherein there is a correlation in shading response between different color channels, the two-dimensional correction surface corresponding to a single color channel (C