Download Colorimetric and multispectral image acquisition by Daniel Nystrom. PDF

By Daniel Nystrom.

ISBN-10: 9185643114

ISBN-13: 9789185643110

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Additional info for Colorimetric and multispectral image acquisition

Sample text

Multispectral imaging is of clear advantage. 2 Terminology The terminology and definitions referring the concepts of multispectral imaging and multi-channel imaging are sometimes confusing, with different meanings by different authors. Throughout this thesis, we will refer to multi-channel images as images containing more then the conventional three color channels (with the exception of CMYK, which is not multi-channel). By multispectral images we mean images in which each pixel contains information about the spectral properties of the samples being imaged.

Full-frame CCD sensors use photocapacitors as photodetectors, arranged as a parallel, vertical charged-coupled device (CCD). The charge collected by the photocapacitors is shifted into a serial horizontal CCD register at the bottom of the array, and then serially transferred to an output amplifier. Because the number of electrons collected in each sensor is proportional to the incident illumination level, the sensor typically has a linear response curve. Full-frame CCDs are primarily used in professional cameras and provides a larger dynamic range due to the larger cell size, compared to interline CCDs, where the photodiode covers only a small fraction of the cell area.

Due to the IR cut-off filter, the spectral power is very low in the band above 750 nm. To block out IR radiation is important, since the CCD sensor is sensitive even in the IR-band, which is a common source of errors, when non-visible light affects the camera response (Hardeberg, 2001; Bala, 2003). The spectral transmittance of the transmissive plate, which should be included in computations from transmission images, is given in the Appendix. 3. Spectral power distribution for the illumination at 90% lamp intensity level.

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