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cn A B 7 Mathematically reconstructing the ambient stray radiation and subtracting it from the UVL image 26) Click on the “uvistray” tab. This uses the Spectralon diffuse reflectance standards in the UVL and corresponding VIS images to generate a mathematical reconstruction of the ambient stray radiation present in the UVL image (for more details see Chapter 1). 27) The positions of the Spectralon diffuse reflectance standards in UVL image are extracted from the alignments carried out in the “align” tab, as described above (Figure 3-72). 28) A matrix of values is created by subdividing the image into the number of standards present (this should be automatically carried over as the number of standards entered for the corresponding VIS image in the “markup” tab in the workflow for the correction of VIS images) and determining the average X, Y and Z values for each of these (Figure 3-72). {8 *65346_an s - uvistray - ni . 2JDl2 Eile Edit View Toolkits Help [ee linear | markup | viscalb | uvkalb | align ! specden | falsecolour| uvlstray Juvkm ! vilstray | vikm | results + Vw C- getspectralon from UV-induced visible lum XX oY Q- remove residual visible light A v C32 label ] UV-induced visible luminescence 01 label | UV-induced visible luminescence S/ object input-Pair_new align.A1. label align.A2 align.A3 | | c32 C33 |_| straighten_prompt | Position line along edge of reflectance standard in UV-induced visible lumin... Ss 013 label ] visible reflectance S straighten_image targets_label | visible reflectance with calibration targets, colour 423 | S targets A F | v [A] object label | visible reflectance of object, colour-calibrated ís object | ] | |_| viscalib.H110 | 929 rotate_prompt | Rotate the reflectance standard to get white at the bottom-left A C—O eS “Image_trans re | angle [Rotate by: | 90 degrees clockwise oI S| 230 | viccalis.c35.matrix | 031) c33.matrix Alona) j A ja. 4 A 0/0988 ]89.8396 j95.5074 105.833 CO first | extract from row: o A €] number | extract this many rows: 1 | Matrix_extract_item.Rows_item.action Q30 | | rotate_widget 0 box, NULL == default ial heal PL) isten] 4QaG 0) (O)inbox...| (Wi) chap... | Co 2re6s [/Ő Test 1..| iB unsav... [Sess P)Fo3.. Wi] chap... | | earch Desktop [OPO GS 1339 Figure 3-72 47) Double left-clicking on the “sample” thumbnail opens a window (C33.sample), which aids in the visualisation of the areas being sampled to create this matrix of values. As previously, a Slider is provided for adjustment to ensure that the areas sampled are within the targets. Adjust as necessary for the available Spectralon diffuse reflectance standards. Note that this should not be necessary if the position of the targets has not moved significantly between frames and the alignment procedure was carried out in the previous tab. 48) If the image is too dark and the targets cannot be seen clearly, click View > Toolbar and check the “Display Control” box. This will bring up a slider which allows the brightness to be adjusted. This change is purely for visual purposes and will not alter the data. Version No. 1.0 161 Date : 14/10/2013
