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Kuijpers, E.A. (author)Existing robot vision algorithms are evaluated for application in space for proximity extraction using one camera. Lighting conditions and image formation differ from earth conditions which have implications. An algorithm is derived which is based on the use of run coding, tracking and a least mean error method. Problems concerning hardware...report 1987
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Roefs, H.F.A. (author), Monkel, A. (author)Project CADISS has produced an elegant breadboard of a system for compression (and -if required- decompression) of signals generated by imaging sensors on-board scientific satellites. The performance, specifications and physical characteristics of CADISS are the result of trade-offs on function (algorithms), technology, through-put speed and...report 1987
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Hogendoorn, R.A. (author)Non-specialist users of data compression often encounter difficulties with the selection of an algorithm, suited for their application. This report tries to facilitate this task by providing the necessary information about the algorithms. Four established, at the National Aerospace Laboratory available algorithms were selected for this study: -...report 1986
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Boerstoel, J.W. (author)An analysis of various alternative approaches in grid generation is presented. A grid-generation procedure for complex aircraft configurations could be based on a combination of three subprocesses, . decomposition of the flow domain into about 100 hexahedronal blocks, . trilineair transfinite interpolation to generate initial grid point...report 1986
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- Markus, A.A. (author) report 1986
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Hoogendoorn, R.A. (author)Computations in numerical fluid dynamics create large sets of data. Transmission of these datasets requires a high speed communication link or, alternatively, the use of data compression techniques. This report describes the results of a study to the applicability of data compression techniques. An algorithm is designed that yields favourable...report 1986
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- Young, I.T. (author), Verbeek, P.W. (author), Mayall, B.H. (author) journal article 1986
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de Pagter, P.J. (author), Renes, J.J. (author)This report describes the results of a feasibility study on image data compression using spline approximation and image segmentation, with emphasis on earth observation applications. The main subjects dealt with, are: the data compression method, implementation aspects, the test software and test results. It appears that a reduction factor of 5...report 1985
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Huijser, R.H. (author)A conceptual design for a research facility for critical point phenomena in Spacelab's microgravity environment is presented. In the critical point facility (CPF) four experiments can be performed in parallel. The CPF consists of five parts: four experiment units and a service module. The experiment units offer the user-provided (instrumented)...report 1985
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Olthof, J. (author), Verhagen, H.J. (author)As a continuation of the initial study on the morphology of the Douro mouth, performed by Hydronamic in 1982, the Administracao dos Portos do Douro e Leixoes commisioned Hydronamic bv to construct a mathematical hydro-morphological model of the Douro mouth. This second part of the morphological study of the Douro mouth is divided into three...report 1984
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van der Lubbe, J.C.A. (author)Image quality plays an important role on the various levels of image processing. However, until now it lacks a survey of methods for the evaluation of image quality. With a grant of the Netherlands Agency for Aerospace Programs (NIVR) a study was performed with respect to the quantification of image quality. Some results of this study are...report 1984
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van Holtz, R.C. (author)The development of a complex data system involving many disciplines requires a strict control from the early phases of a project onwards, to ensure that all requirements are met within the technical and financial constraints. To exercise such control becomes more difficult when different institutes/organizations contribute to the system, the...report 1983
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van Popta, R.G. (author)Since mid 1982, the Royal Netherlands Meteorological Institute KNMI has to its possession a ground station (KOSMOSS), which receives and processes high resolution imagery, acquired from Tiros-N type weather satellites. To determine the weather positions in the images, the ground station is equipped with the capability to superpose, in real time,...report 1983
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Blom, H.A.P. (author)A sophisticated starting point for a probabilistic approach to the radar tracking problem is a Markov jump-diffusion model for the aircraft dynamics, its control and the radar measurements. From nonlinear filtering theory, a closed form description of the evolution of the conditional distribution of this Markov process can be obtained. This jump...report 1983
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van Popta, R.G. (author)A method is described, by which geographical data are superposed in real time to the high resolution HRPT imagery, received from the TIROS-N series satellites. The superposition of additional geographical data is important for an accurate position determination of the image data. Computations necessary for the transformation, conversion and...report 1982
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Gerritsen, F.A. (author)This report describes the design and implementation of the Delft Image Processor DIP-1. In this pipelined image-processing computer, a number of storage and processing modules which operate concurrently and synchronously (hardware floating-point ALUs and multiplier, conversion table and cellularlogic table) may be interconnected in a...report 1982
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- Verboom, G.K. (author), Os, A.G. van (author) report 1982
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Blom, H.A.P. (author)The problem considered is filtering for Gaussian observations of linear differential systems that are driven by both Wiener processes and marked Poisson point processes. Well-known representations of the MMSE-filter for such a Markov jump-diffusion are a differential for the evolution of its conditional density or differentials for all its...report 1982
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Pool, A. (author), Simons, J.L. (author), Wensink, G.J.H. (author), Willekens, A.J.L. (author)The STALINS method for measuring take-off and landing trajectories is briefly described and results of flight tests made in 1978-80 are discussed. The method now meets the requirements to which it was designed, and a few improvements in the hardware and software are being finalized. The method is expected to be ready for operational use in the...report 1980
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Moek, G. (author)This report constitutes the deposit of a study of literature on martingales and estimation theory. Some experimental work concerning the efficiency of an estimation algorithm based on martingales is also described. The investigation has been guided by the intent to investigate martingales in relation to the Kalman and Kalman-Bucy filters and to...report 1980