Stranica 166 [166]
OCR
16) 17) 18) (c) Where the images used for calibration are not the same images to be calibrated, either because it is a "twin" image not containing the standards (as in Figure 3-71) or another frame taken with the same camera and lighting conditions. This may be the situation if carrying out work in the field where site constraints may not allow the standards to be easily included in the frame or if batch processing a number of different frames taken with the same camera and lighting conditions. {1} *F:\Technical Imaging\John Cupittizip filesibm2ibm-workspaces2.ws - align 012 Elle Edit View Tookits Help | input linear markup / viscalb wieato [tg] specaen falsecolour MUEEASS had Eile View Help MV A - match UV-induced visible luminescence to vis x Image, 2592x3888 32-bit float, 3 bands, XYZ, 115.33 MB, 9.45x9.45 p/mm (1614, 60) 24.1549 27.1178 34.875 Magnification 1:6 AT | Al | uvicalib.B6 G) = |e2_} GD) <> ® (Match g 32-bit float, 3 bands, XYZ reference s adjust <> bp2 Mark on AZ.adjust at (2268, 2384) CDR CDSS CD <> reference J adjust —_—_ b) Figure 3-68 1G tsa] 6 @ 0) As with the previous workflow, alignment is carried out by selecting a pair of points in each image. The corresponding UVL images are rotated and scaled according to the position of these points in the corresponding images until these are aligned. The VIS images in the “reference” thumbnails are automatically carried over from the “viscalib” tab. The UVL images in the “adjust” thumbnails are carried over from the “linear” tab. To align the Spectralon diffuse reflectance standards in the VIS and UVL images, double left-click on the A2 “reference” thumbnail to bring up the image view window containing the VIS image and two points, A2.apl and A2.ap2 (Figure 3-68). These should be automatically placed in the same locations as for the D26 “reference” VIS image. Zoom in or out of the image as necessary by pressing “+” or “-” (or “i” or “o”), respectively. Double left-click on the A2 “adjust” thumbnail to bring up the image view window containing the corresponding UVL image (Figure 3-69). Move the points A2.bp1 and A2.bp2 to the same locations as for the VIS image. It may be useful to have the image view window containing the VIS image open simultaneously. If the image is too dark or light, 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. 158
