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：2002
卷号：XXXIV Part 3 B
页码：227-230
出版社：Copernicus Publications
摘要：This paper describes the use of computer vision techniques to obtain cartography of materials and damages, in a semi-automatic way, of indoor fa.ades of historical buildings, as a support to planify the restoration works. For this purpose, a cost-effective equipment is designed to acquire digital images from the visible and near infrared regions of the spectrum, and spectral and texture classification techniques are used to convert those images into informational classes. The equipment is composed of a monochromatic CCD camera, sensitive to the visible and NIR, with a peak of sensitivity at about 760 nm. The camera sends the signal to a frame grabber connected to a computer, where the image is processed. After calibration of the camera, 5 images centred at different spectral wavelengths (from 400 to 900 nm.) are acquired using optical filters. The scene is illuminated using diffuse light to avoid shadows on materials. Radiometric adjustment and geometrical registration are made, and then a mosaic of the images is composed using ground control points. In addition to the spectral images, spatial information is obtained from textural features extracted by mean of the co-occurrence matrix, energy filters and multi-resolution analysis using a wavelet transform. A statistical selection process of the most relevant features is made, and the final classification is evaluated attending to the information provided by archaeologists and architects that carry out the restoration works. The methodology is applied indoors to a monument and the results are discussed, as well as some improvements that should be made in the future to integrate the equipment in order to be operative in the field
关键词：Cultural Heritage; Classification; Texture; Camera (CCD); Cartography
