OBTAINING GROUND TRUTH FOR MULTISPECTRAL PHOTOGRAPHY

摘要

The ratio of the intensity of the radiation directionally reflected from a background or reference target in a selected portion of a spectral region extending from substantially 260 nanometers to substantially 3,000 nanometers or emitted by the target in a selected portion of a spectral region extending from substantially 3,000 nanometers to substantially 20,000 nanometers to the intensity of incident solar radiation at a point near the target is determined at intervals of 5 nanometers. Similar ratios are determined for a specimen of an anomalous target visually similar to the background target. Filters are selected for multispectral photography having maximum transparency in the bands where the ratios are different. Multispectral photographs employing such filters are optimally adapted to distinguish between the two types of targets.