René van Egmond

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We focus on the evaluation of texture similarity metrics for structurally lossless or nearly structurally lossless image compression. By structurally lossless we mean that the original and compressed images, while they may have visible differences in a side-by-side comparison, they have similar quality so that one cannot tell which is the original. This is(More)
In order to facilitate the development of objective texture similarity metrics and to evaluate their performance, one needs a large texture database accurately labeled with perceived similarities between images. We propose ViSiProG, a new Visual Similarity by Progressive Grouping procedure for conducting subjective experiments that organizes a texture(More)
In three experiments the perceived roughness of visual and of auditory materials was investigated. In Experiment 1, the roughness of frequency-modulated tones was determined using a paired-comparison paradigm. It was found that using this paradigm similar results in comparison to literature were found. In Experiment 2, the perceived visual roughness of(More)
In a previous study we investigated the roughness of real world textures taken from the CUReT database. We showed that people could systematically judge the subjective roughness of these textures. However, we did not determine which objective factors relate to these perceptual judgments of roughness. In the present study we take the first step in this(More)
Products, with all their sensory properties, evoke certain sensations that lead to a particular product experience. For example, a red sports car with its aerodynamic shape, soft leather seats, firm steering wheel, and roaring engine could cause high arousal and therefore can be experienced as thrilling, sophisticated, and/or sportive. Such experiences(More)
In two experiments the effect of sound on visual information was investigated. In Experiment 1 the effect of the visual appearance of product types with an expensive deign and with an inexpensive design on the experience of the sound recordings of these products was investigated. Recordings and pictures were systematically interchanged. Thus, for example,(More)
OBJECTIVE We examine how transitions in task demand are manifested in mental workload and performance in a dual-task setting. BACKGROUND Hysteresis has been defined as the ongoing influence of demand levels prior to a demand transition. Authors of previous studies predominantly examined hysteretic effects in terms of performance. However, little is known(More)
Compared to other parameters in product design, visually relevant shape parameters strongly determine the success of a product in the market. Since designers are responsible for the visual appearance of the product, they tend to be critical in their decisions concerning the type and the values of the shape parameters. However, it is not fully understood how(More)
Among the variables in product design, shape parameters have a relatively strong influence on the success of the product in the market. This is especially true for parameters controlling the visual appearance of consumer goods. Decisions about the type and values of the parameters are therefore critical. However, the information on which these decisions(More)