Stranica 190 [190]
OCR
Match the brightness (luminance) of the IRR and/or UVR image to the calibrated VIS image 7) If processing the IRR and/or UVR images, click on the “specden” tab to the right. The spectral density correction of the IRR and UVR images is carried out by matching the luminance of these images to that of the calibrated VIS image (see Workflow for the correction of IR and/or UV-reflected images and the generation of IR and/or UVreflected false-colour images). 8) Check that the areas being sampled to create the matrix of values for comparison with the VIS image are within the targets by double left-clicking on the “sample” thumbnail which opens a window (B9.sample). A slider is provided to adjust this as necessary for the available Spectralon diffuse reflectance standards, although 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. Generate the IRR and/or UVR false-colour image 9) If processing the IRR and/or UVR images, click on the “falsecolour” tab to generate the IRR and/or UVR false-colour images from the calibrated VIS image and the corrected IRR and/or UVR images (see Workflow for the correction of IR and/or UV-reflected images and the generation of IR and/or UV-reflected false-colour images). 10) To generate the IRR false-colour image, check that “X-RG” option is selected at K9. To generate the UVR false-colour image, check that “GB-X” option is selected at K2. Mathematically reconstruct the ambient stray radiation and subtract it from the UVL and/or VIL images 11) If processing UVL and/or VIL images, click on the “uvistray” tab (or the “vilstray” tab for VIL images). This uses the Spectralon diffuse reflectance standards in the UVL (or VIL) and corresponding VIS images to generate a mathematical reconstruction of the ambient stray radiation present in the UVL (or VIL) image (for more details see Chapter 1). 12) Check that the areas being sampled to create the matrix of values for use in generating the mathematical reconstruction are within the targets by double left-clicking on the “sample” thumbnail which opens a window. A slider is provided to adjust this as necessary for the available Spectralon diffuse reflectance standards, although 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 (see Workflow for the correction of UV-induced visible luminescence (UVL) images). Exposure compensation of the UVL image 13) If processing UVL images, the possibility to adjust the exposure (luminance values) of the UVL image using a slider is provided, so that these are accommodated comfortably within the sRGB colour space gamut. However this should only be required if any of the XYZ values of the images in Al are greater than 100. (see Workflow for the correction of UV-induced visible luminescence (UVL) images). Version No. 1.0 182 Date : 14/10/2013
