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：2004
卷号：XXXV Part B1
页码：249-254
出版社：Copernicus Publications
摘要：In state-of-the-art orthophoto production aerial films are routinely scanned to a digital format using roll-film scanners. Scanning parameters for a large number of images are typically set subjectively based on only a few images and quality check is done visually after scanning. For further use, orthophotos are often radiometrically enhanced, but the criteria for these enhancements are mostly subjective. The objectives of this study were to develop tools for the radiometric quality control (QC) of the scanning process and to investigate the tone tuning process of colour infrared (CIR) images. The central method of the radiometric QC is a 100% histogram control. The histograms of all scanned images are calculated during the scanning process and compared to existing tolerance values. These calculations also aid in the scanning parameter selection. In this study, the tolerance values were determined based on histograms of a total of 2818 images taken using four types of film. The conclusion was that the main statistics of image histograms were efficiency, 99%-efficiency and saturation. Experience has shown, however, that also a visual check of images is essential in addition to the automatic histogram control. Based on extensive investigations of radiometrically enhanced orthophotos, a tone-model-image for the tone tuning process was created
