Stranica 84 [84]
cas A NI 7
iii. UV-reflected Images
The workflow shown in Figure 2-27 summarises the corrections proposed as a result of the
discussions in Chapter 1 and also highlights the general transformations to be carried out by
the post-processing software.
FREESE
Camera output Corrected for Corrected Corrected UV False colour
spatial for reflected image image
inhomogeneities Spectral
of light source density
(Flat fielding)
Image
registration
Figure 2-27. Schematic of the workflow proposed for UV-reflected images.
The requirements in order to carry out the image correction procedure are as follows and are
included as a checklist at the end of the image capture workflow (see below):
1) The camera output file, i.e. the UV-reflected image;
2) The ICC profile (which records all the metadata including the gamma correction applied to
the image. This describes and is created on the conversion from RAW into a standard 16¬
bit TIFF file, see Chapter 3). This profile is contained within the TIFF file and is
automatically retrieved by the post-processing software;
3) An image of a uniform reflective board under the same experimental conditions for flat
fielding, if available;
4) An image of a Spectralon diffuse reflectance grey scale or any number of Spectralon
diffuse reflectance standards as available (included as part of the image to be calibrated
or another image taken with the same camera and lighting conditions);
5) A visible-reflected image (including a Spectralon diffuse reflectance grey scale or any
number of Spectralon diffuse reflectance standards as available) obtained as described in
section i (See above).
Version No. 1.0 76 Date : 14/10/2013