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Calibration of color cameras requires that a calibration pattern is recorded and color responsivity curves are estimated from the recorded data. Very often, these curves are sampled at discrete wavelength, so that the calibration problem can be written as a system of linear equations. The solution of the – usually overdetermined – problem is subject to a(More)
In this contribution we present experiments on color image enhancement for several different non-linear filters which originally were defined for gray-level images. We disturb sample images by different types of noise and measure performance of the filters. We provide signal-tonoise measurements as well as perceived color difference in ∆E as defined by the(More)
Typical computer vision systems usually include a set of components such as a preprocessor, a feature extractor, and a classifier that together represent an image processing pipeline. For each component there are different operators available. Each operator has a different number of parameters with individual parameter domains. The challenge in developing a(More)
The vector median filter(VMF) is a useful and common tool for noise removal in color image processing[HPP04,PV00,AHN90]. The drawback of the approach in its general form is the high computational cost. Indeed it takes O(n×m×ms) distance evaluations for computing the filter response, where ms ist the mask size and n×m the dimension of the image. In this(More)
Zusammenfassung. In diesem Paper wird ein zweistufiges Verfahren zur Farbkalibrierung vorgestellt, welches auf [2, 6, 5] basiert. Unter Farbkalibrierung ist in diesem Kontext die farbmetrische Charakterisierung und die Normierung von Bilderfassungsgeräten zu verstehen, die dem Ziel dient, aufgenommene Szenen in Szenen unter zuvor definierten(More)
Images corrupted by the noise during either transmission or acquisition process. Filtering and or smoothing an important task to reduce the effect of noises that contaminates images. Hence the processed image is useful for further applications. This paper analyses the suitable smoothing filter for the edge mask derived using Third Order Difference Equation(More)
Zusammenfassung In diesem Beitrag wird der Einfluß der Farbnormierung und der Farbkalibrierung auf die Performanz der farbbasierten Objekterkennung am Beispiel eines Roboters mit einem omnidirektionalen Kamerasystem untersucht. Der Roboter soll ein Objekt, in diesem Fall einen roten Ball, in einem langen Flur mit stark variierender Beleuchtung finden. Zur(More)
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