Methods to compensate manufacturing variations and design imperfections in a capsule camera

摘要

A method characterizes manufacturing imperfections in a camera and variations in its operating environment to allow images captured by the camera to be compensated for these defects. The method includes: (a) illuminating a field of view of the optical elements under a controlled condition; (b) exposing multiple images onto the image sensor under the controlled condition; (c) extracting from the multiple images parameter values for pixels of the image sensor; and (d) compensating images taken subsequently in the camera using the parameter values. The controlled condition includes an external light source for illumination, and the image sensor is sensitive to color components.

主权项

1. A method for characterizing a camera having an image sensor comprising a plurality of pixels, the method comprising:
illuminating a field of view of the camera under a controlled condition; exposing one or more test images of the illuminated field of view onto the image sensor of the camera under the controlled condition; extracting from the one or more test images parameter values for the pixels of the image sensor, taking into account pixel-to-pixel variations in the image sensor; storing the extracted parameter values in an archival memory of the camera; retrieving the parameter values from the archival memory; and compensating an image captured in the image sensor at a subsequent time using the retrieved parameter values, taking into account a difference between an operating condition at the subsequent time and the controlled condition.