Correction of non-uniform sensitivity in an image array

A method of correcting sensitivity of pixels of an imager device, the method comprising:

• determining whether a main lens is misaligned with a pixel array comprising a plurality of microlenses and a plurality of pixels;
• focusing light onto the pixel array through the main lens and producing a plurality of pixel signals from the plurality of pixels;
• and
• correcting the plurality of pixel signals by applying a correction function to each pixel signal according to a correction function scheme using a sensitivity correction unit;
• wherein the sensitivity correction unit adjusts the correction function scheme according to a detected misalignment between the pixel array and the main lens.

An imager device, comprising:

• a pixel array comprising a plurality of microlens and a plurality of pixels, wherein the pixel array captures images focused onto the pixel array by a main lens;
• a sensitivity correction unit coupled to the pixel array, wherein the sensitivity correction unit selectively corrects the sensitivity of pixel signals from the plurality of pixels according to a plurality of correction functions;
• and
• a memory storing a plurality of derivatives of the correction functions,
• the plurality of derivatives comprising a first derivative of the correction functions for less than all of the plurality of pixels, wherein a first derivative of the correction functions is defined as the difference between two correction functions.

A method of correcting sensitivity of pixels of an imager device, the method comprising:

• projecting an image onto a pixel array comprising a plurality of pixels;
• producing a plurality of pixel signals from the plurality of pixels;
• calculating a plurality of correction functions using a plurality of derivatives of the correction functions;
• and
• correcting the plurality of pixel signals by applying the plurality of correction functions to the plurality of pixel signals,
• the plurality of derivatives comprising a first derivative of the correction functions for less than all of the plurality of pixels, wherein a first derivative of the correction functions is defined as the difference between two correction functions.