Stranica 79 [79]
OCR
= a & pa e I CHARISMA B 7 li. Infrared-reflected Images The workflow shown in Figure 2-24 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. Camera output Corrected for Corrected Corrected IR False colour spatial for reflected image Image inhomogeneities Spectral of light source density (Flat fielding) Image registration Figure 2-24. Schematic of the workflow proposed for infrared-reflected images. The reguirements 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 infrared-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 16bit 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). A workflow has been developed to ensure that these requirements are collected according to the optimised and standardised acquisition protocols. The instructions below describe the workflow for the capture of infrared-reflected images. Version No. 1.0 71 Date : 14/10/2013
