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| submission_guidelines [2017/03/02 10:02] – [Reflectance Transformation Imaging (RTI)] lafont | submission_guidelines [2017/03/02 10:04] – [Reflectance Transformation Imaging (RTI)] lafont |
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| When preparing files for upload and backup, it is important to note that the above file-structure should be used for each side of the captured object. In order to avoid the usage of too much storage-space the content of "jpeg-exports" should be deleted before upload. | When preparing files for upload and backup, it is important to note that the above file-structure should be used for each side of the captured object. In order to avoid the usage of too much storage-space the content of "jpeg-exports" should be deleted before upload. |
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| === Processing RTI captures === | |
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| There are several ways to process images taken by the camera dome to an output file (*.ptm). The easiest way is to use the "builder". Upon opening there appears a small window. By pressing on the button "Build" the respective face of a captured artefact needs to be chosen. The user needs to select the main folder itself and not its sub-directories. Depending on the computer memory the processing takes about 2-5 minutes, whose completion is indicated by a dialogue "Fitting completed". In contrast to the RTIbuilder offered by Cultural Heritage Imaging, the fitting software takes all necessary steps itself. It copies the images in the directory "original-captures" and creates a duplicate in "jpeg-exports". After that the ptm-fitter is used in combination with the coordinates of each light source saved in "generic.lp". The 76 light positions (lp) represent the coordinates on the X, Y, and Z axes and are derived from the original calibration of the camera dome. [This calibration is done by placing a glossy ball (e.g., a red or black snooker ball) in the dome reflecting the various lights. Due to the reflections on the glossy sphere the location of the light source within the hemispheric camera dome can be extrapolated. A similar approach is achieved using highlight RTI and therefore an ever changing set of light positions within each capture.] During the building process the lp-file is copied into the folder "assembly-files" and renamed: capture.lp. | [[http://cdli.ucla.edu/pubs/cdln/php/single.php?id=54|Here are information on capturing RTI images with the camera dome]]\\ |
| | [[http://cdli.ucla.edu/?q=rti-images|Here are samples of RTI images of cuneiform texts and cylinder seals]]\\ |
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| | === Processing RTI captures === |
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| [[http://cdli.ucla.edu/pubs/cdln/php/single.php?id=54|Here are information on capturing RTI images with the camera dome]]\\ | There are several ways to process images taken by the camera dome to an output file (*.ptm). The easiest way is to use the "builder". Upon opening there appears a small window. By pressing on the button "Build" the respective face of a captured artefact needs to be chosen. The user needs to select the main folder itself and not its sub-directories. Depending on the computer memory the processing takes about 2-5 minutes, whose completion is indicated by a dialogue "Fitting completed". In contrast to the RTIbuilder offered by Cultural Heritage Imaging, the fitting software takes all necessary steps itself. It copies the images in the directory "original-captures" and creates a duplicate in "jpeg-exports". After that the ptm-fitter is used in combination with the coordinates of each light source saved in "generic.lp". The 76 light positions (lp) represent the coordinates on the X, Y, and Z axes and are derived from the original calibration of the camera dome. [This calibration is done by placing a glossy ball (e.g., a red or black snooker ball) in the dome reflecting the various lights. Due to the reflections on the glossy sphere the location of the light source within the hemispheric camera dome can be extrapolated. A similar approach is achieved using highlight RTI and therefore an ever changing set of light positions within each capture.] During the building process the lp-file is copied into the folder "assembly-files" and renamed: capture.lp. |
| [[http://cdli.ucla.edu/?q=rti-images|Here are samples of RTI images of cuneiform texts and cylinder seals prepared]]\\ | |
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| === Processing RTI images for webviewer === | === Processing RTI images for webviewer === |
