Method and system for black-level correction on digital image data

A device, comprising:

• an image sensor;
• an optical unit for forming an image on the image sensor;
• a storage medium for storing a look-up table, wherein the look-up table has information indicative of black levels measured at least at one sampling location on the image sensor, wherein the measured black levels include the black level of each of a plurality of color sensing components in the image sensor at the sampling location;
• and
• a computation module adapted to receive raw image data from the image sensor and to retrieve information from the look-up table so as to carry out black-level correction on the raw image data based on the information, wherein the look-up table comprises information indicative of the spatial locations of pixels from which the raw image data is obtained so that the black-level correction on the raw image data is also based on the information.

A device comprising:

• an image sensor;
• an optical unit for forming an image on the image sensor;
• a storage medium for storing a look-up table, wherein the look-up table has information indicative of black levels measured at least at one sampling location on the image sensor, wherein the measured black levels include the black level of each of a plurality of color sensing components in the image sensor at the sampling location;
• and
• a computation module adapted to receive raw image data from the image sensor and to retrieve information from the look-up table so as to carry out black-level correction on the raw image data based on the information, wherein the raw image data includes image data at different spatial locations of the image sensor and the black levels are measured at a plurality of sampling locations, and the look-up table is generated based on the black levels measured at said plurality of sampling locations so that the black-level correction on the image data at different spatial locations is based on black levels measured at least at some of said plurality of sampling locations.