and home appliances such as smart refrigerator, smart air-conditioner and smart TV, etc. Since remote screen sharing systems are also increasingly prevalent, we propose a cross-platform middleware infrastructure which supports remote monitoring and control functionalities based on remote streaming for networked intelligent devices such as smart phone, computer and smart watch, etc. As a result, we can always gain access of an intelligent machine by obtaining control of its display contents. The system has been tested in engineering labs and student assessment is provided.Įlectronic visual display enabled by touchscreen technologies evolves as one of the universal multimedia output methods and a popular input intermediate with touch–interaction. A proof-of-concept solution is described which also includes other previously reported useful features.
While many solutions have been proposed so far, this paper addresses an important issue of facilitating remote lab deployments by providing remote connectivity services to lab providers using a Relay Gateway Server architecture. Thus, remote laboratories accessible through the Internet can resolve cost and access constraints as they can be used at flexible times and from various locations. In addition, experimental equipment at many sites is typically underutilized. At the same time, the Internet has become a common networking medium and is increasingly used to enhance education and training. However, shortage of equipment, high costs, and the lack of human resources for laboratory maintenance and assistance decrease the implementation capacity of the hands-on training laboratories.
Hands-on experiments prepare students to deal with real-world problems and help to efficiently digest theoretical concepts and relate those to practical tasks. While this is indeed a noticeable improvement in practice, and contributes to making VNC more effective in some of the collaborative settings we discuss, we conclude that more fundamental changes are needed to approach 25 FPS and make a display wall using VNC even better suited for collaboration. These techniques improve the frame rate from 8.14 to 10 for the low resolution video, and from 4.3 to 5.9 for the high resolution video. Then we selected the best performing implementation, TightVNC, and modified it by using the Intel SSE2 instruction set to speed up data movement, and by using assembler language to speed up the encoding of the pixels. First we profiled, measured and compared the performance of two existing implementations of the VNC model, TightVNC and RealVNC, when playing back a 3 megapixel and a 7 megapixel video. We report on an effort to identify the performance bottlenecks, and how we reduced them.
The applications also suffer because they must run at the same computer as the VNC server. However, the frame rate at the display wall becomes very low because of performance bottlenecks in the computer running the VNC server, and because of not enough network band width. A VNC viewer runs on each of the display wall computers displaying a tile each of the total desktop. We use a virtual network computing (VNC) server with a desktop at 22 megapixels for our display wall. It is well suited for collaboration because multiple users can easily fit in front of it, simultaneously viewing much more information and interacting with many more applications than what is possible using standard-sized displays. A tiled display wall comprises several computers and projectors for a total of twenty to one hundred megapixel displayed over a whole wall.
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