Design and development of four to sixteen channel video multiplexers

Video multiplexer series were successfully designed and built for prototype and evaluation both in terms of hardware and software. The hardware platform was designed to accommodate up to sixteen color video input channels for time lapse or real time recording on a single video cassette recorder. This product implements four modes of operation; Live, Record, Playback and Menu mode, which is not a full mode of operation. Menu mode is a series of on-screen programming menus which appears on Live, Record and Playback modes. Menu mode enables the user to program the machine to work under specific modes of application. For Video encoding a new video-capture processor, called Bt819 made by BrookTree, was chosen to minimize the cost and system overhead of adding video input and capture to PC video/graphics systems. This development by BrookTree employs the firm\u27s time-tested digital Ultralock technology to generate the required number of pixels per line using fixed frequency clock. On-chip pixel buffering and image scaling are provided for our QUAD picture on a monitor. Inter-integrated circuit (I2C) communication was chosen to talk to this chip directly. The video syncs were generated from PIC microcontroller using assembly language. This program was designed at 13.5 Mhz (74 nsec) clock rate which follows NTSC CCIR-601 digital video standards. Alarm package design idea came from understanding of link-list programming and was tested on four separate video signals

A distributed network architecture for video-on-demand

The objective of this thesis is to design a distributed network architecture that provides video - on - demand services to public subscribers. This architecture is proposed as an alternative to a centralized video service system. The latter system is currently being developed by Oracle Corporation and NCube Corporation. A simulator is developed to compare the performance of both the distributed and centralized video server architectures. Moreover, an estimate of the cost of both systems is derived using current price data. It is shown that the distributed video server architecture offers a better cost / performance trade-off than the centralized system. In addition, the distributed system can be scaled up in an incremental fashion to increase the system capacity and throughput. Finally, the distributed system is a more robust system: in the presence of component failure, it can be configured to isolate or bypass failed components. Thus, it allows for graceful performance degradation, which is difficult to achieve in a centralized system

A General Framework and Communication Protocol for the Real-Time Transmission of Interactive Media

In this paper we present a general framework for the real-time transmission ofinteractive media, i.e. media involving user interaction. Examples of interactive media are shared whiteboards, Java animations and VRML worlds. By identifying and supporting the common aspects of this media class the framework allows the development of generic services for network sessions involving the transmission of interactive media. Examples are mechanisms for late join and session recording. The proposed framework is based on the Real-Time Transport Protocol (RTP) which is widely used in the Internet for the real-time transmission of audio and video. Using the experience gained through the framework for audio and video, our work consists of three important parts: the definition of a protocol profile, the instantiation of this profile for specific media, and the development of generic services. The profile captures those aspects that are common to the class of interactive media. A single medium must instantiate this profile by providing media-specific information in the form of a payload type definition. Based on the profile, generic services can be developed for all interactive media. In this paper we focus on the description of the profile for the real-time transmission of interactive media. We then present the main ideas behind a generic recording service. Finally we show how multi-user VRML and distributed interactive Java animations can instantiate the profile

Automatic Target Handing Over System .

The image seen by the airborne seeker and the image (of the same scene) seen by the operator through the high resolution sensor (thermal sight) are different in spatial resolution. In order to establish the correlation between these two images, the thermal sight image needs to be resampled and made similar to the seeker image by applying a preprocessing technique. The preprocessing is carried out by a handling over system (HOS) that resamples the thermal sight image making it compatible with seeker image and hands over the resampled image to the seeker. This paper discusses the implementation of the suitable handling over algorithm. (Boland, J.S. et al. automatic target hand using correlation techniques. Technical report, Auburn University, Alabama, 31 January, 1977, pp.57-63). Emphasis is laid on developing suitable hardware and software and tests to match the two images obtained by two different sensors of the same scene. The hardware and software have been evaluated with sets of images. The H/W is designed around iAPX 86 family of processor and software is developed in PL/M. Hardware also includes the recording facility on a standard VCR, to record the performance of handling over electronics (HOE) during testing/flight trials. Evaluation of the system by realistically simulating the field scenario in the laboratory has shown that the HOS is functioning satisfactorily