Patent ID: 8606051

Claim:
An image processing system comprising: an image sensor array comprising a plurality of pixels arranged as rows and columns; and a converter subsystem comprising a set of column analog-to-digital converters (ADCs), each column ADC communicatively coupled with a corresponding column of the image sensor array and comprising a column counter, the converter subsystem configured to: convert incident light exposed to the pixels of each row into digital pixel data for the row using the set of column ADCs and the respective column counter of each column ADC during a frame conversion time, each row being selected serially for processing, and the pixels of each row being converted substantially in parallel by the set of column ADCs; and calibrate the set of column ADCs using the respective column counter of each column ADC during an inter-frame time interval that is outside the frame conversion time to generate calibration data for each of the column ADCs, wherein the column counter is reset prior to calibrating the column ADC and is reset again prior to converting the incident light.