Method and apparatus for correcting vignetting effect caused on an image captured by lightfield cameras

A method for correcting vignetting effect caused on an image captured by a lightfield camera comprising an image sensor array including plurality of photosites, the method comprising:

• obtaining luminance values from each photosite;
• obtaining a set of weight values for compensating the vignetting effect for each photosite, wherein said set of weight values is associated with a present setting of the lightfield camera;
• and
• changing the luminance values of each photosite based on the obtained set of the weight values wherein luminance values of each photosite are normalized to be transformed to a maximum magnitude,
• wherein a Lambertian object image is captured to generate luminance values of each photosite and wherein the weight values are calculated by:
• determining a maximum luminance value from the generated luminance values;
• dividing the maximum luminance value by the generated luminance values of the photosites when the Lambertian object image is captured to calculate the weight values;
• comparing each luminance value of the generated luminance values with a first value;
• and
• if the compared luminance value of a corresponding photosite is less than the first value, setting a respective weight value of the corresponding photosite equal to 0.