PHOTOGRAMMETRIC EXPLOITATION OF HDR IMAGES FOR CULTURAL HERITAGE DOCUMENTATION
Basic goal of this project is to investigate and therefore highlight the usefulness of High Dynamic Range Images for photogrammetric applications in the field of Cultural Heritage Documentation. Scenes with High Dynamic range – difference between the brightest and the darkest parts &nd...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2013-07-01
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| Series: | ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | http://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/II-5-W1/209/2013/isprsannals-II-5-W1-209-2013.pdf |
| Summary: | Basic goal of this project is to investigate and therefore highlight the usefulness of High Dynamic Range Images for
photogrammetric applications in the field of Cultural Heritage Documentation. Scenes with High Dynamic range – difference
between the brightest and the darkest parts – is impossible to be recorded without loss of details and texture in dark areas (due to
underexposure) and in bright areas (due to overexposure) because of digital sensor's limitation in high dynamic range recording. In
digital recording, the most recent and effective solution is High Dynamic Range Images (HDRI). These images are created by
merging multiple images of the same scene, each of which has been taken with different shutter speed and thus providing a better
range of images with different exposures. An HDR image alone is overcoming the loss of information caused by unfavorable lighting
conditions. In photogrammetric applications, images have to be of high quality and represent faithfully the scene they depict. For
applications of Cultural Heritage Documentation, where during image acquisition lighting conditions might be difficult, HDR
technology can positively contribute to the acquisition of images of better quality and, consequently, to the creation of orthophotos
with no radiometric problems. In this paper, a detailed reference to HDRI technology is made and also the geometric reliability and
photogrammetric applicability of HDR images is examined and confirmed. In addition, an example of photogrammetric application
in Cultural Heritage Documentation is presented and evaluated. |
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| ISSN: | 2194-9042 2194-9050 |