Simplified Method for Radiometric Calibration of an Array Camera

Abstract

Radiometric calibration of a CCD camera is a first step when quantitative measurements for pixels values will be performed in order to extract scene characteristics. Usually, the radiometric behaviour of the camera can be modelled with a polynomial function obtained from a multi- image calibration method, which analyses several pictures taken with different exposition times. In this work, a simplification of a multi-images calibration method is proposed. The method is based on the comparison of grey values of two images only, showing that obtained results are comparables to the polynomic multi-image method. The proposed method was tested with the same images used for multi-image calibration method. Exposition times were estimated without an iterative scheme. Also a method and results for distance estimation, using inverse radiometric response function, are showed in this paper.