Scene illumination adaptive lens shading correction for imaging devices

A method of processing an image, the method comprising:

• determining one or more gain adjustment surfaces for a reference illuminant type that is selected from a plurality of illuminant types;
• determining an illuminant type for the image to be processed;
• and
• modifying each of the gain adjustment surfaces using a scene adjustment surface determined based on the illuminant type for the image to be processed;
• and
• processing the image using the one or more modified gain adjustment surfaces.

An imaging device comprising:

• an imaging sensor comprising an array of imaging pixels;
• a storage device for storing at least one set of gain adjustment surface parameters and at least one set of scene adjustment surface parameters;
• and
• a signal processing circuit for adjusting signals from the array, the signal processing circuit configured to:
• determine a gain adjustment value using one of the sets of stored gain adjustment surface parameters;
• determine a scene adjustment value using one of the sets of stored scene adjustment surface parameters that is selected based on an illuminant type;
• modify the gain adjustment value using the scene adjustment value;
• and
• generate a corrected pixel signal using the modified gain adjustment value.

An imaging system comprising:

• an input for receiving information on a determined illuminant type of an image;
• an array of pixels for capturing the image, each pixel having at least one photosensor;
• a storage circuit for storing at least one scene adjustment surface, each scene adjustment surface stored in association with an illuminant type;
• and
• a processing circuit for scene adaptive lens shading correction of pixel output signals produced by the array of pixels and corresponding to the image, the lens shading correction being performed in accordance with received information on the determined illuminant type and a scene adjustment surface corresponding to the determined illuminant type.