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Reconstructing the shape of an object from images is an important problem in computer vision that has led to a variety of solution strategies. This monograph focuses on photometric stereo, that is, techniques that exploit the observed intensity variations caused by illumination changes to recover the orientation of the surface. In the most basic setting, a diffuse surface is illuminated from at least three directions and captured with a static camera. Under some conditions, this allows to recover per-pixel surface normals. Modern approaches generalize photometric stereo in various ways; for example, relaxing constraints on lighting, surface reflectance and camera placement, or creating different types of local surface estimates. Starting with an introduction for readers unfamiliar with the subject, A Survey of Photometric Stereo Techniques discusses the foundations of this field of research. It then summarizes important trends and developments that have emerged in the last three decades. The focus is on approaches with the potential to be applied in a broad range of scenarios. This implies, for example, simple capture setups, relaxed model assumptions, and increased robustness requirements. This is an ideal reference for anyone looking for an understanding of the diverse concepts and ideas around this topic and how we can move towards more general techniques than traditional photometric stereo.
The first edition of this manual appeared in 1992 and was entitled ECAT Assay Procedures. It was the result of a unique cooperation between experts brought together by the European Concerted Action on Thrombosis and Disabilities (ECAT). The Concerted Action was at that time under the auspices of the Commission of the European Union. The second edition, like the first edition, deals with diagnostic tests within the field of thrombosis. However, the second edition has a broader scope because it is no longer limited by the frontiers of ECAT. Experts allover the world, in and outside ECAT, have contributed to this edition. The editors are very grateful for their contributions. The need for a new edition is obvious. Since 1992 new assays have been introduced for research, diagnosis, and therapy of thrombosis; for other assays improvements have been suggested, while a few others became redundant. The editors waived the radioimmunoassays of ~-thrombog1obulin and platelet factor 4 due to the fact that the kits required for these assays are rarely, or no longer, available. Also the PAI-1 activity assay was waived as it is liable to many inconsistencies and to large variations. A list of names and addresses of manufacturers marketing the kits and reagents has been compiled, together with a list of the recommended nomenclature of quantities in thrombosis and haemostasis, in order to facilitate the use of the updated version. These lists have been carefully compiled by Johannes J. Sidelmann, PhD, Department of Clinical Biochemistry in Esbjerg, Denmark.
This important work educates individuals working within the youth justice system of the usefulness-and-limitations-of psychological assessments in the processing of youthful offenders. The authors favor a child welfare and rehabilitative approach, but they argue that the use of valid assessments can improve the quality and consistency of judgments and inferences made about youths in any system by improving the quality of the information used. The book closes with extensive recommendations and appendices listing instruments, procedures, and resources.
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