APPARATUS AND METHOD FOR GAIN CORRECTION IN AN IMAGE SENSOR

摘要

An apparatus and method for digital column gain mismatch correction are described. At least one test signal pixel is added to each column in an image sensor. For each column the test signal from at least one test pixel is read and compared to a target value. A correction value is calculated based on comparing the test signal to the target value. The correction value is stored in a memory. When the regular photo-pixels are read, the photo-pixel signals are modified based on the stored correction value for each column.