Measurement and processing of signatures in the visible range using a calibrated video camera and the CAMDET software package

Dan Sheffer

doi:10.1117/12.276682

20 June 1997 Measurement and processing of signatures in the visible range using a calibrated video camera and the CAMDET software package

Dan Sheffer

Author Affiliations +

Proceedings Volume 3062, Targets and Backgrounds: Characterization and Representation III; (1997) https://doi.org/10.1117/12.276682
Event: AeroSense '97, 1997, Orlando, FL, United States

Abstract

A procedure for calibration of a color video camera has been developed at EORD. The RGB values of standard samples, together with the spectral radiance values of the samples, are used to calculate a transformation matrix between the RGB and CIEXYZ color spaces. The transformation matrix is then used to calculate the XYZ color coordinates of distant objects imaged in the field. These, in turn, are used in order to calculate the CIELAB color coordinates of the objects. Good agreement between the calculated coordinates and those obtained from spectroradiometric data is achieved. Processing of the RGB values of pixels in the digital image of a scene using the CAMDET software package which was developed at EORD, results in `Painting Maps' in which the true apparent CIELAB color coordinates are used. The paper discusses the calibration procedure, its advantages and shortcomings and suggests a definition for the visible signature of objects. The Camdet software package is described and some examples are given.

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Dan Sheffer "Measurement and processing of signatures in the visible range using a calibrated video camera and the CAMDET software package", Proc. SPIE 3062, Targets and Backgrounds: Characterization and Representation III, (20 June 1997); https://doi.org/10.1117/12.276682

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