By Daniel Nystrom.
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Extra resources for Colorimetric and multispectral image acquisition
For neutral colors ∆E*94 equals ∆E*ab, while ∆E*94 becomes smaller for more saturated colors. , 2000; CIE, 2001). Beside the chroma and hue weighting functions used in CIE94, CIEDE2000 include a number of additional parameters to further compensate for the non-uniformity of CIELAB. 1 Instruments Color measurement instruments, fall into two general categories: broadband and narrowband instruments. Broadband instruments uses broadband filters to filter the incoming radiation and delivers up to three color signals.
1%. 5 Uniform illumination To obtain spatial uniformity in the images acquired, the illumination should be uniform over the entire scan area, or any non-uniformity should otherwise be compensated for. Considering the small field of view, due to the large magnification of the optics, uniform illumination over the scan area should not be hard to achieve. However, for shorter focal lengths giving a larger field of view, non-uniform illumination was detected, due to the directed properties of the light and the rather small light cone.
1. Typically, device characterization is carried out relatively infrequently compared to calibration, which is done more frequently to compensate temporal changes and maintain a device in a fixed known state. The two form a pair, so if the characteristic color response of the 27 device is altered by a new calibration, the characterization should be re-derived. 1. Calibration and characterization for input and output devices. (© Bala, 2003) The characterization function can be defined in two directions.