Michael A. Wirth

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— In this paper we investigated the applicability of commonly used white-balancing algorithms to restoring faded photographic colour slides. We have used three sets of synthetic data that simulated colour damage in Kodak Ektachrome slides, as well as three sets of real digitized faded Kodak Ektachrome slides. We have restored all the data sets using nine(More)
The largest single feature on a mammogram is the skin-air interface, or breast contour. Extraction of the breast contour is useful for a number of reasons. Foremost it allows the search for abnormalities to be limited to the region of the breast without undue influence from the background of the mammogram. Segmentation of the breast-region from the(More)
The largest single feature on a mammogram is the skin-air interface, or breast contour. Extraction of the breast contour is useful for a number of reasons. Foremost it allows the search for abnormalities to be limited to the region of the breast without undue influence from the background of the mammogram. Segmentation of the breast-region from the(More)
The scanning and computerized processing of images had its birth in 1956 at the National Bureau of Standards (NBS, now National Institute of Standards and Technology (NIST)) [1]. Image enhancement algorithms were some of the first to be developed [2]. Half a century later, literally thousands of image processing algorithms have been published. Some of these(More)
One of the caveats of the process of designing image processing algorithms is that they are often tested on insignificant numbers of images. This paper discusses the influence of mammogram databases on the performance evaluation of algorithms. We hope to demonstrate that the use of extensive collections of mammograms with varied characteristics to assess(More)
The processing of colour images to improve sharpness is nearly always been realized in RGB colour space. This paper explores the effects of using different colour spaces on the application of image sharpening algorithms. Part of the goal is to determine which colour space provides a result which does not differ immeasurably from the original with respect to(More)