http://hdl.handle.net/10204/909 2013-06-19T14:12:45Z http://hdl.handle.net/10204/6796 Title: Future-proofing an aircraft self-protection IR signature database Authors: Alayeda, M; El-Desouki, MM; Alsawadi, MS; Alghamdi, K; Al-Ghamdi, AA; Willers, CJ; Mudau, AE; Bezuidenhout, DF Abstract: Aircraft self-protection against heat seeking missile threats is an extremely important topic worldwide, recently even more so with the instability in the Middle East region due to, for example, the large number of man-portable air defense systems (MANPADS) that were stolen from army arsenals. A fundamental step in successfully achieving self-protection is the ability to capture and identify aircraft infrared signatures. This work discusses some of our efforts and results in creating an asset database for infrared signatures. The database was designed in a way that will feed an image processing engine to allow for automated feature and signature extraction. A common failing in the handling of target signature raw data is the fact that raw data files can become unreadable because of changes in technology, software applications or weak media archiving technology (e.g. corrupt DVD media). A second shortcoming is often the fact that large volumes of raw or processed data are stored in an unstructured manner, resulting in poor recall later. A third requirement is the portability of data between various processing software packages, legacy, current and future. This paper demonstrates how the challenge of future-proofing measured data is met with reference to the archiving and analysis of data from a recent measurement campaign. Recommendations for future work are given, based on the experience gained. Description: SPIE Conference Proceedings, Edinburgh, Scotland, 24-27 September 2012. Published in SPIE Digital library 2012-09-01T00:00:00Z http://hdl.handle.net/10204/6790 Title: Pyradi: an open-source toolkit for infrared calculation and data processing Authors: Willers, CJ; Willers, MS; Santos, RAT; Van der Merwe, PJ; Calitz, JC; De Waal, A; Mudau, AE Abstract: Electro-optical system design, data analysis and modelling involve a significant amount of calculation and processing. Many of these calculations are of a repetitive and general nature, suitable for including in a generic toolkit. The availability of such a toolkit facilitates and increases productivity during subsequent tool development: “develop once and use many times”. The concept of an extendible toolkit lends itself naturally to the open-source philosophy, where the toolkit user-base develops the capability cooperatively, for mutual benefit. This paper covers the underlying philosophy to the toolkit development, brief descriptions and examples of the various tools and an overview of the electro-optical toolkit. The toolkit is developed as a cooperative effort between the CSIR, Denel SOC and DCTA. The project, available on Google Code at http://code.google.com/p/pyradi, is managed in accordance with general practice in the open source community. Description: SPIE Proceedings, Edinburgh, Scotland, 24-27 September 2012. Published in SPIE Digital Library 2012-09-01T00:00:00Z http://hdl.handle.net/10204/6520 Title: Colour and camouflage: design issues in military clothing Authors: Baumbach, J Abstract: Camouflage, the art of going (as long as possible) undetected by an observer, has changed over the last decade to become a discipline with a more scientific and analytical foundation. Design of a camouflage system needs to consider the capabilities of the human as an observer (on both physiological and psychophysical levels.) Description: Copyright: Woodhead Publishing,Cambridge,UK 2012-07-01T00:00:00Z http://hdl.handle.net/10204/6502 Title: A comparison of image features for registering LWIR and visual images Authors: Cronje, J; De Villiers, J Abstract: This paper presents a comparison of several established and recent image feature-descriptors to register long wave infra-red images in the 8–14 m band to visual band images. The feature descriptors were chosen to include robust algorithms, SURF and SIFT — and fast algorithms, BRISK and BFROST. To evaluate the feature-descriptors a ground truth was created by determining the intrinsic and extrinsic camera calibration parameters for the cameras and using this to photogrammetrically relate pixel positions between the images. The inlier results of each feature descriptor for the top 20%, 50% and 100% of the matches (based on match strength) were used to create a homography. The average pixel error between the homography reprojected feature points and the photogrammetric reprojection was used as the error. The results show that none of the descriptors perform well in standard form, with BFROST faring slightly better than the other algorithms. This suggests a need to modify the algorithms to detect physical/structural features and de-emphasise textural features. Description: 23rd Annual Symposium of the Pattern Recognition Association of South Africa (PRASA), Pretoria, South Africa, 29-30 November 2012 2012-11-01T00:00:00Z