Stranica 28 [28]
OCR
u.a , 1.04 [d | “a, 4— B 504 Oriel-calibrated Light source ed Intensity /a.u. a Transmittance normalis; w . . 029 / / "aa \ | ate 104 a kH gaa Fi " \ e if a ee aoe a” 2 5-6 eee’ Se oe eocces 8s, T t T T T T T 400 450 500 550 600 650 700 400 500 600 700 Wavelength/nm Wavelength/nm monochromator F—— akt brated J ight source Camera with Camera with set white set white balance balance Figure 1-16. Scheme showing the procedure for measuring the spectral sensitivity of the camera sensor, characterized by means of a calibrated Czerny-Turner monochromator and a calibrated light source (Oriel-QTH). — Image registration The dimensions of the UV- and IR-reflected images are different from those of the visible The adjustment in focal point in capturing each of these images results in the difference in size observed. As a result, overlaying these images for comparisons or processing them to produce false-colour images can be challenging, as it often requires manual adjustment and resizing of the images. A tool in nip2 was previously developed for this purpose. Although this tool does not fully automate the procedure, it facilitates it by enabling the user to pick similar points in the images of interest which it uses as reference. It also enables the batchprocessing of image sets. This module will thus be integrated into the workflow for the correction of reflected images for particular application to the creation of false-colour images, as discussed in Chapter 3. — Summary Figure 1-17 and Figure 1-18 summarise the workflows which will be used in the development of the post-processing software, based on the correction requirements discussed in this section. They highlight the transformations which must be carried out for each image set and also record the requirements in terms of images or files which will be necessary for the postprocessing software to carry out the image correction procedure. Development and operation of the software will be discussed further in Chapter 3. Version No. 1.0 20 Date : 14/10/2013
