Yazar "Cak, S" seçeneğine göre listele

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    Öğe
    An ergonomic rendering system for industrial design
    (Elsevier Science Bv, 1997) Cak, S; Dizdar, EN; Ersak, A
    Product design is one of the most important stages in production processes depending on commercial aims and current technology. Success in modelling the products guarantees that customers' requests can be supplied by these products. Aim of using solid modelling techniques in industrial product design is getting realistic models of products in computer environments in such a way that manufacturers could obtain enough information on the products without having to manufacture them. Execution time and quality of the solid modelling technique used in the produce design influence the total production time and quality. Solid modelling techniques based on visual realism increases the time spent on product modelling. Nevertheless, the techniques based on fast execution time generate low-quality solid models of products. Study tries to design a rendering system based on visual realism with an acceptable run-time efficiency. For that reason, a software accelerator is designed in order to accelerate the rendering process. This program implemented by using object oriented programming techniques has a user-friendly and interactive environment between the rendering system and the designers.
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    Öğe
    A fuzzy colour quantizer for renderers
    (Elsevier Science Bv, 1998) Cak, S; Dizdar, EN; Ersak, A
    This paper presents a new colour quantization method for ray tracing. Normally, quantization is carried out by generating statistics about the colours present in the original image. Then a colour look-up table is created which contains the colours available in the quantized image. Original quantized values are mapped into the nearest colour entries in the look-up table. Although the execution time is quick using this method (histogram analysis) the cost is that the image quality is poor. The fuzzy c-means clustering algorithm (FCM) is an alternative solution to ameliorate the degradation in image quality. However, FCM introduces a considerable amount of computational burden and the process is time-consuming. This paper shows that the dominant peaks of histograms yield the fuzzy centroids needed for the first estimate in FCM. This reduces the computational burden imposed by FCM and improves the overall execution time. (C) 1998 Elsevier Science B.V. All rights reserved.