Browsing by Subject "Multimedia"

Now showing 1 - 3 of 3

Open Access
Education in interactive media: a survey on the potentials of computers for visual literacy
(1996) Güleryüz, Hakan
This study aims at investigating the potentials of multimedia and computers in design. For this purpose, a general survey on the historical development of computers for their use in education and possibilities related to the use of technology in education is conducted. Based on this survey, the depictions related to the incorporation of technology in design education in particular are compiled for the purpose of producing an example of multimedia application. The application uses the actual student projects of FA101 Basic Design course offered in the Graphic Design Department curriculum of Bilkent University, Faculty of Art, Design and Architecture.
Open Access
An index structure for moving objects in video databases
(1999) Yavuz, Tuba
Modeling moving objects and Iiandling various types of motion queries are interesting topics to investigate in the area of video databases. In one type of motion queries, motion of multiple objects is specified by the changes in relative spatial positions of objects. Answering such kind of queries, that involve motion of multiple objects whose identifications cire not specified, requires some type of indexing because the time complexity of processing such a query in the absence of an index structure is 0{N \l{N — n)!), where N is the number of objects in the database and n is the number of objects in the query. In this work, we propose a spatio-temporal index structure, which we call ,S'M/A7-index, and compare its performance against a similar scheme proposed in [18]. The scheme presented in [18] consists of a constraint satisfaction algorithm, which is called Join Window Reduction (JW R ), combined with a spatial index structure (R*- tree). Experimental results indicate thcit SMIST-'mdex outperforms the JW R algorithm. Also, SMIST-'mdex is shown to be scalable to increasing number of frames and objects.
Open Access
Multiresolution block coding method for visualization of compressed images in multimedia applications
(Society of Photo-Optical Instrumentation Engineers, 1994) Gerek, O. N.; Cetin, E. A.
Multimedia and Picture Archiving and Communication System (PACS) applications require efficient ways of handling images for communication and visualization. In many Visual Information and Management Systems (VIMS), it may be required to get quick responses to queries. Usually, a VIMS database has a huge number of images and may provide lots of images for each query. For example, in a PACS, the VIMS provides 10 to 100 images for a typical query. Only a few of these images may actually be needed. In order to find the useful ones, the user has to preview each image by fully decompressing it. This is neither computationally efficient, nor user friendly. In this paper, we propose a scheme which provides a magnifying glass type previewing feature. With this method, a multiresolution previewing without decompressing the whole image is possible. Our scheme is based on block transform coding which is the most widely used technique in image and video coding. In the first step of our scheme, all of the queried images are displayed in the lowest possible resolution (constructed from the DC coefficients of the coded blocks). If the user requests more information for a region of a particular image by specifying its size and place, then that region is hierarchically decompressed and displayed. In this way, large amounts of computations and bandwidth usage are avoided and a good user interface is accomplished. This method changes the ordering strategy of transform coefficients, thus reduces the compression ratio, however this effect is small.