spaper23 - IEEE TRANSACTIONS ON MULTIMEDIA, VOL. 10, NO. 4,...

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Unformatted text preview: IEEE TRANSACTIONS ON MULTIMEDIA, VOL. 10, NO. 4, JUNE 2008 629 Interactive Transmission of JPEG2000 Images Using Web Proxy Caching Juan Pablo Garca Ortiz, Vicente Gonzlez Ruiz, Manuel Francisco Lopez, and Inmaculada Garca Abstract This paper describes and analyzes JPIP-W, an in- novative proposal for the interactive transmission of JPEG2000 images on the Internet. JPIP-W is an extension of JPIP, the current JPEG protocol proposed for interactive JPEG2000 image browsing. One of the JPIP characteristics of greatest interest is its ability to use the Web for retrieving images. However, JPIP is unable to exploit the large infrastructure of todays Web caching systems (proxies), used to reduce response time and network traffic. To overcome this drawback, JPIP-W defines a new server-client interaction consisting of splitting JPEG2000 images into data blocks that can be cached by the proxies. These blocks can be shared among several clients, allowing fast recovery of some portions of the images. Experimental results demonstrate that JPIP-W significantly reduces JPIP retrieving times. Index Terms JPEG2000, JPIP, progressive image transmission, remote browsing of images, web caching. I. INTRODUCTION R EMOTE image browsing is widely used in todays ap- plications, such as remote surveillance, e-commerce, teleconference, medical diagnosis, remote astronomy, telemi- croscopy and remote image databases, among others. In these applications, users visualize digital images stored in remote servers using the Internet as the communication media. In a remote browsing scenario, images are transmitted on de- mand from a server to a client (see Fig. 1). Basically, the server splits the image into pieces of data that are encapsulated in packets which are going to be transmitted to the client. As a consequence of the FIFO scheduling mechanism used by the switches to dispatch the incoming packets, the Internet does not provide a service that promises how long it will take to deliver the data from the sender to the receiver. Therefore, regardless of the underlying protocol, each packet spends a finite, but unpre- dictable, amount of transmission time between the server and the client. Let be the transmission time of the first packet the client receives. After this initial delay, and depending on the net- work bandwidth available, the remaining packets arrive after seconds. Therefore, the user can visualize the full image after a delay of seconds. To minimize , images must be transmitted in a compressed format. In general, is approximately reduced by a factor of Manuscript received february 1, 2007; revised December 2, 2007. This work was supported in part by Grants TIN2005-00447 (Spanish Ministry of Educa- tion and Science) and P06-TIC-01426 (Consejera de Innovacin, Ciencia y Em- presa, Junta de Andaluca). The associate editor coordinating the review of this manuscript and approving it for publication was Dr. S.-H. Gary Chan....
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spaper23 - IEEE TRANSACTIONS ON MULTIMEDIA, VOL. 10, NO. 4,...

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