Method and apparatuses for pedestal level compensation of active signal generated from an output signal of a pixel in an image sensor

摘要

A pedestal level compensation method includes calculating a dark level difference error depending on temperature, calculating a pedestal level offset depending on an analog gain, and compensating a pedestal level according to the dark level difference error and the pedestal level offset.

主权项

1. A method, comprising:
calculating a dark level difference error corresponding to an operating temperature, based on: (1) a first dark level difference between a dark level for an active pixel of an image sensor and a dark level of an optical black pixel of the image sensor at a reference temperature, and (2) a second dark level difference between a dark level for the active pixel and a dark level of the optical black pixel at the operating temperature; calculating a pedestal level offset corresponding to an analog gain that is applied to an active signal generated from an output signal of the active pixel; and compensating a pedestal level that is applied to the active signal according to the dark level difference error and the pedestal level offset.