Subtitle: Fully Networked DVCS Distributed Image Control System
Abstract: DLP rear-projection video walls and LCD video walls are widely used in monitoring centers and dispatch centers across various fields. These large screens utilize multi-screen image controller systems to comprehensively process and display multiple signal sources. Different industries have varying requirements for the signal processing and display capabilities of these multi-screen image controller systems based on their specific display application needs. This paper primarily introduces the technical characteristics of the DVCS (Distributed Networked Visual Control System).
I. Common Signal Source Types for Large-Screen Splicing Display Systems
DLP/LCD large screen display systems require input signal sources for processing and display. Common sources include: computer and workstation RGB/DVI signals, composite video signals, and 1080p high-definition video signals. Signal sources for special industries also include: ultra-high resolution signals such as GIS (Geographic Information System), GPS (Satellite Positioning), SCADA (Power Monitoring and Control), and SIG (Traffic Dispatch), as well as IP digital streaming media video.
II. Differences between DVCS Distributed Image Control System and Traditional Multi-Screen Image Controller
Traditional multi-screen image controllers are industrial PCs with a PC architecture, consisting of RGB capture cards, video capture cards, and multi-screen graphics output cards. All display tasks and system operation are processed based on a single PCI bus. The processing power of this type of image controller is limited by the bandwidth of the PCI bus, resulting in extremely limited signal processing and display capabilities. When the splicing screen is large and the number of signals is large, it is basically impossible to achieve dynamic real-time display of all signals.
If ultra-high resolution signals such as GIS, SCADA, and SIG are also present, this type of multi-screen image controller installs GIS, GPS, SCADA, and SIG application software on the controller and displays them through a multi-screen graphics card. All signal processing is based on the PCI bus, consuming significant system resources, and real-time display of computer and video signals is impossible. Of course, this installation is also limited by the controller's operating system platform; not all application software can be installed and run. Furthermore, this traditional PC-based multi-screen image controller has a limited number of slots, resulting in a limited number of input signals and output channels, which is insufficient for large-scale video wall displays.
Due to the numerous technical drawbacks of traditional PC-based multi-screen image controllers, the fully networked DVCS distributed image control system has emerged.
III. The DVCS system is a completely new image control system architecture.
The DVCS system is a novel network-based image control system consisting of signal input processors and display output processors. All processors are connected to an Ethernet data switch via CAT5e/6 network cables. Each signal is processed and transmitted independently, and the windowed display of the signals is controlled by the DVCS control server and control software. It boasts advantages such as networking, digitalization, high performance, high reliability, flexible expansion, and environmental friendliness, placing it at an internationally leading technological level.
The various signal processors in the DVCS control system can be arbitrarily selected and combined to form a distributed image control system, depending on the scale of the display wall and the number of signal sources. Its technical advantages lie in its superior ability to input multiple signals, flexible signal input methods (including local and remote signals), strong system scalability, and high-definition digital image display with pixel-to-pixel mapping.
IV. The DVCS system is a fully digital image control system.
The DVCS system is a fully digital image control system. The acquisition, encoding, transmission, decoding, and display of any signal source all utilize pure digital technology, ensuring no signal loss or interference and achieving high-quality image display. All signal processing and transmission are completed within the DVCS system network, which provides internal format conversion. RGB, DVI, HD, and video signals can be processed and displayed on any DVI or RGB interface display device at any size and position.
V. The DVCS system is an image control system with superior processing capabilities.
The DVCS system boasts superior multi-signal processing capabilities, including analog RGB, digital DVI, standard definition video, high definition video, audio, ultra-high resolution signals, and IP streaming video, covering all signal sources for large-screen display applications across various industries. The number of signals that can be connected is virtually unlimited (depending on the network switch size), supporting display walls of any size. Employing the industry-leading DVCS patented processing engine, each signal is processed independently by its respective processor channel, and updates are only applied to pixels showing information changes, enabling real-time display of all signal sources. Up to 64 fully real-time active windows can be opened within any display unit, and the same signal source can be simultaneously displayed on any number of display units, with all windows synchronized in real time. All signal windows can be displayed at any size, position, and overlap within the full screen.
VI. The DVCS system is an image control system that provides synchronized audio and video processing.
The audio processor of the DVCS control system can synchronously connect the audio from signal sources to the DVCS network, receiving both digital and analog audio with high-fidelity sound quality. Through the control center's sound reinforcement equipment and DVCS control software, it can achieve synchronized audio and video playback from any signal source, meeting the needs of sound reinforcement applications such as command center/control room DVDs, video conferencing, and alarm workstations, eliminating the need for a separate sound reinforcement system.
VII. DVCS is an image control system that provides signal source sharing.
A DVCS system is an Ethernet-based video switching system with superior network connectivity. Multiple DVCS systems can be connected via a dedicated network, allowing multiple display systems to share the same signal source and enabling remote display access, providing a leading solution for industries such as emergency command.
The DVCS control system has a display wall mirroring function, which can realize the synchronous mirroring of the full-screen signal images between the display wall of the dispatch and command center and the display wall of the decision-making room/consultation room. This will greatly facilitate the decision-making and command of the leaders in the decision-making room and their simultaneous viewing of the same model, and help the personnel in the command center to receive the leaders' instructions and accurately dispatch and operate.
8. The DVCS system is a highly reliable image control system.
The DVCS control system is a distributed architecture system, with image processing calculations distributed across various processors. A failure in one processor only affects that specific signal channel or display unit, without disrupting the normal operation of the DVCS system. Any signal source can be switched to another channel for display, facilitating emergency display for the entire large-screen system. All computer/video signal processors in the DVCS control system employ a reliable embedded design, boasting an exceptionally long MTBF (Mean Time Between Failures) of 100,000 hours. All signal processors support hot-swapping technology; if any processor fails, it can be quickly replaced on-site. The DVCS system automatically identifies the new processor and puts it into operation without manual configuration, minimizing the MTTR (Mean Time Between Failures).
9. DVCS is a flexible and expandable image control system.
In a DVCS system, various signal processors can be added at any time as needed for project expansion. If necessary, a 10G backbone switch can be added for cascading, providing highly flexible system expansion capabilities. All added processors can be automatically integrated into the existing DVCS system without requiring any secondary development for the expanded applications, reducing system expansion costs.
10. The DVCS system is a simple and intuitive image control system.
The DVCS system adopts a B/S architecture control and management software, providing a simple and intuitive graphical user interface. Each signal can be previewed in real time, and all open-window signals can be displayed on the control software interface. It supports pre-setting, storing, recalling, and automatically executing scheduled layouts for the large screen. It supports remote network control, large screen zone display management, simultaneous scheduling by multiple users, and multi-level management permission settings.
Delta Electronics' globally leading DVCS networked distributed image control system effectively breaks through many technical bottlenecks of traditional PC-based image processors, opening a new chapter for the display applications of DLP/LCD large-screen display systems in dispatch and command centers and monitoring centers across various industries, and providing the most valuable leading solutions.
