Fig. 8
Pictures showing the areas chosen as transmittance reference (in green) for the acquisitions #4 to #12 of the case study AG-1177. The differences between the pictures in the first row and the ones in the second row are due to the inclination of the camera during the recording of the first set of images. Acquisitions #4 and #9 (a, d), #6 and #12 (b, e) and #7 and #10 (c, f) were processed using the same glass pane. Some paper sheets were also placed on the sides of the panel during acquisition #12 to decrease the contrast between the dark colored glass and the transparent ones