Oldal 146 [146]
OCR
Sz) (a) To correct an IRR image: Load an image containing a Spectralon diffuse reflectance grey scale or any number of Spectralon diffuse reflectance standards as available into the top box on the “targets” thumbnail (Figure 3-40). This image will be used to generate the spectral density correction and can be the image you want to correct or another image taken with the same camera and under the same lighting conditions. It can remain in place for batch-processing (see later) as long as the camera and lighting conditions remain the same. If available, load an image of a uniform reflective board (under the same experimental conditions) for flat fielding into the bottom box on the “targets” thumbnail and check the option to "Flatfield IR reflectance with calibration targets image" (Figure 3-41). If this is not available leave this option unchecked. Load the image(s) you want to correct into the top box on the “object” thumbnail (Figure 3-41). This can be the Same image as above or another frame (e.g. another frame in a series or a “twin” image not containing the spectralon diffuse reflectance standards, as described in Chapter 2 and shown in Figure 3-42) taken with the same Camera and under the same lighting conditions. If available, load an image of a uniform reflective board (under the same experimental conditions of the image) for flat fielding into the bottom box on the “object” thumbnail (Figure 3-41 and Figure 3-42) and check the option to “Flatfield IR reflectance of object image”. If this is not available leave this option unchecked (as in Figure 3-42). tkm vilstray / vilkm results v E- IR reflectance xg A v E2 label | IR reflectance A v | targets label | IR reflectance with calibration targets ha 8 ve] Edit Í Header Flatfield IR reflectance with calibration targets image 8 Duplicate g § Recalculate bel ++ " with calibration targets") Reset ob. pflectance of object A v A v flatfield Pair_flatfield (targets.image) (label ++ " of object") Pair_load "IR reflectance" Figure 3-40 ‘km |vilstray , vilkm results v E- IR reflectance 9 2) e2) ] label | IR reflectance i. targets label | IR reflectance with calibration targets ar. i image use_flatfield |) Flatfield IR reflectance with calibration targets image = hz Pair_flatfield NULL (label ++ " with calibration targets") a v a v <> object label | IR reflectance of object a 1 i image use_flatfield / [7 Flatfield IR reflectance of object image u J.K Pair. flatfield (targets.image) (label ++ " of object") A v a v Pair_load "IR reflectance" Figure 3-41 138 Date : 14/10/2013
