期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2008
卷号：XXXVII Part B7
页码：353-356
出版社：Copernicus Publications
摘要：Remote sensing uses many different types of imagery for interpretational purposes. Multispectral photography has shown to be of especially high interpretational value. During remote sensing studies which are done "in situ", determining spectral reflectance coefficients of any given object is crucial. Spectrometers are usually used in acquiring such data. The authors of such a study have used an equipment set consisting of a digital video camera and an electronically tunable filter. The set is designed to work in the visible range 400-720nm. The matrix in this camera has a resolution of 1392 x 1040Px. It is capable of binning (the joining of pixels) 2x2, 4x4 and 8x8, which allows for the increase in sensitivity at the loss of resolution. Monochromatic images acquired by the camera have a radiometric resolution of 12bits. The images are saved into the controlling computers memory by means of the IEEE- 1394 FireWire interface. The camera has a fully automated exposure mechanism together with an ROI function. The electronically tunable filter allows for the acquisition of images of a 10nm band, with a 0.1nm step, within the given spectral range. Special software had been designed to control the set (the camera and filter), which allows for the acquisition of any chosen sequence of images within the entire visible range of the electromagnetic spectrum, as well as their primary processing. On the basis of a sequence of images, the spectral reflection coefficient can be determined for any objects within the scene. The image sequences can be acquired in laboratory conditions, as well as during fieldwork. The article describes the methodology in acquiring imagery using the video camera and the electronically tunable filter, as well as the determining of the spectral reflection coefficients. Additionally a comparison will be made between the reflection coefficients obtained by means of a spectroradiometer and those derived from the registered imagery
关键词：Hyper spectral; Acquisition; Camera; CCD; Image; Video
