Extracting flat-field images from scene-based image sequences using phase correlation
- 1 June 2016
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 87 (6), 063710
- https://doi.org/10.1063/1.4954730
Abstract
Flat-field image processing is an essential step in producing high-quality and radiometrically calibrated images. Flat-fielding corrects for variations in the gain of focal plane array electronics and unequal illumination from the system optics. Typically, a flat-field image is captured by imaging a radiometrically uniform surface. The flat-field image is normalized and removed from the images. There are circumstances, such as with remote sensing, where a flat-field image cannot be acquired in this manner. For these cases, we developed a phase-correlation method that allows the extraction of an effective flat-field image from a sequence of scene-based displaced images. The method uses sub-pixel phase correlation image registration to align the sequence to estimate the static scene. The scene is removed from sequence producing a sequence of misaligned flat-field images. An average flat-field image is derived from the realigned flat-field sequence.This publication has 16 references indexed in Scilit:
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