Video Wall Image Scaling Why it's important

With isemc video walls, source content resolution is typically substantially smaller than the combined pixel output resolution offered by the displays in the video wall. The vast majority of existing source content is 1080p with most new content being created now at 4k.

Video walls typically can offer 6k or even 16k pixel output resolution, so it is not uncommon to scale up content four or even sixteen times its original pixel count for output on the video wall. 

Scaling on a 2x2 video wall:

With four 1080p displays combined into a 2x2 video wall, you actually have the capacity to display 4k resolution. Hence, the source content needs to be upscaled roughly four times to 4K to output to the 2x2 wall (four displays). This scales up the 1080p source file stretching it across four displays. Though the algorithms are typically more complex, in the simplest approach (linear scaling), it takes one pixel and expands it into four.

Server Scaling

Scaling is common in video walls and there are many different scaling algorithms that vary in terms of perceived visual quality basically, a viewer's ability to see pixilation—and CPU demands. One way to achieve scaling is to intelligently utilize the built-in scalers within the display (these hardware-based scalers add no performance load to the server and generally create very good image quality).

One way to do this is by sending a 720p source to a 1080p display. In a network video wall, this “display scaling” can often create quite good results as it places less demand on the network and host CPU.  Additionally, the built-in scalers in most displays provide more than decent visual scaling quality.

Performance-optimized Scaling

Another approach is to use a performance-optimized scaling algorithm on the CPU. Useful offers an optimized mix of server scaling and display scaling” to balance performance available bandwidth/CPU with visual results.

This enables us to use the best scaling algorithms, and scale on the server side up to full output resolution without bogging down the CPU. Useful automatically optimizes the scaling algorithms based on a user's setup and content, but also provides the option to manually specify if a user wants to substantially improve visual image quality on heavily scaled video walls.

isemc provides professional video wall controllers

iSEMC Video Wall Controller is the core of the CCTV monitoring system. It receives all the video signals and displays them on the display, while recording all the video signals. The CCTV monitoring system refers to the closed-circuit television monitoring system, which is an important part of the security technical defense system.

It mainly uses equipment to monitor and control many important places or places that cannot be inspected in real time by personnel. And this system transmit the scenes of all places to one or more monitoring rooms for display, in order to record the situation.

The front end is generally composed various cameras and lens, a pan-tilt, etc. which are used to obtain images of the monitored area.

. The video cable or WiFi transmits the video signal output from the camera to the monitoring point equipment, the controller. It plays the role of information decoding and encoding and can be compatible with a variety of front-end equipment to achieve control and communication functions. iSEMC provides a software can control the movement and adjustment of camera to rotate up and down, left and right, and view the recorded signals. The software can also send out an alarm signal. send the corresponding alarm information through the signal transmission medium, and show out an alarm light and sound signal on the screen to remind the security personnel.

Its terminals generally include monitors, various control equipment, and recording equipment, etc., for display and recording, video processing, output control signals, and receive signals from the front end. The display device can display the signal processed by the controller, and can display the image through the computer monitor, screen, or professional monitor. The video wall controller iSEMC supports multi-screen splicing, and displays camera information in multiple regions.

iSEMC video wall controller is very suitable for surveillance and security scene,Check out our latest CCTV + Multimedia Information Release System video wall controller solution

LCD, LED and DLP are three commonly used in current display technology. Different display technology will lead to different display effect. They have own advantages and disadvantages, depends on your using needs, you must select the display technology more correspondent.

LCD
At present, the most cost-effective screen equipment in command center, which is also the mainstream product.
Advantages:

- High resolution,1920*1080 can be achieved on a single screen.

- Moderate brightness and contrast, bright colors.

- No dazzling to watch for a long time.

- Stability and durability of screen. It can work on continuously for a whole day.

- Low maintenance cost.

Disadvantages:

- There are joint lines between the screens, so that the image will have a division. It could be a visual impact. The currently available of the patchwork panel is 0.88mm.

LED

Advantages:

- No matter how to splice the screens there are no display barriers between them.

- Adjustable brightness, flexible splicing.

Disadvantages:

- High unit price, high overall cost.

- Over time there will be a large number of lamp beads damaged, no bright or only display monochrome. In this situation,

- Low resolution.

DLP

DLP is a rear-projection technology that uses a chip to produce images by refracting a screen.

Advantages:

- The highest resolution can reach 1080 like the LCD screen. There are two size of screen 16:9 and 4:3.

- The patchwork is extremely small, only 0.2mm,which is almost the same as seamless..

Disadvantages:

- the screen is expensive, maintenance costs such as replacement of light bulbs are high.

- Low brightness, the screen reflects light when the light hits it. At present, more users begin to shift from DLP to LCD with small patchwork.

In the display system of command center, you need to consider encoding and decoding ability of monitoring equipment, and the command center is used all year round, which requires high stability of screen. iSEMC video wall controller supplier provides display products, solutions and technical service to satisfy your demands from all sides on display system.

Video wall and its importance in monitoring center

The role of convergence and big data has made video walls more and more important to the success of surveillance centers. Using a variety of software and hardware, the goal of any video wall in an operation center or surveillance center is to provide operators with the visual information they need to monitor, evaluate, and respond to various threats. Whether it is a large wall-to-wall monitor or a simple 2 to 2 video wall, operators can see what they need to see in a smaller facility.

Since the video wall is mainly used to highlight important information for the operator, it is necessary to understand the types of data that can be important for both standard operations and emergency situations. Then, operators and other stakeholders will look at this common operation map (COP) to provide correct actionable information and enhance situational awareness. In keeping with the trend of the entire security industry, there is more and more integration between various technologies including video, audio, etc., and video walls are used to display more and more information in a fast-access and user-friendly format. As almost all the latest security devices and applications utilize big data, the amount of information available to the command center will continue to increase, which will place higher and higher requirements on the processor behind the video wall. More and more at any time. Remote sources and push content to remote locations, so today's video wall processors must display IP-based content as well as traditional sources directly connected to the chassis. "In addition, remote workers are common nowadays, so the processor must also be able to send walls or any areas of interest to mobile devices."

More and more control room command center monitoring centers are using this technology. In the future, isemc believes that it will go to various industries and give people more convenient and faster work.

CVR is also called central-level video network storage equipment. It is a collective name for a class of special security video surveillance equipment developed from enterprise-level standard IPSAN/NAS network storage equipment combined with video surveillance applications.

    Network high-definition video surveillance solves the problem of unclear image quality of analog surveillance video, and also poses challenges to supporting facilities such as network and storage. With the explosive growth of digital high-definition, the demand for storage capacity has grown geometrically. From the perspective of capacity, small-bay storage products (such as less than 8 bays) are greatly restricted by the number of cameras that can be stored. Therefore, the market demand for large-bay storage products is increasing, so many manufacturers have launched 8 Bay NVR, 16 bay NVR, 24 bay NVR to cope with the increase in capacity demand.

However, the increase in the number of disks alone cannot actually solve the problem. Embedded NVRs usually cannot meet the application requirements. Because of the increase in transfer capacity, actual applications have put forward performance, redundancy and reliability, manageability and maintainability. higher requirement. Therefore, the industry has set its sights on the inherent high performance (enterprise-level general-purpose processors), high reliability (RAID disk redundancy, network redundancy, redundancy, fan redundancy), and high manageability and maintainability (standard industrial Components, standard management protocols and interfaces) enterprise-level standard IPSAN / NAS network storage equipment.

IPSAN/NAS network storage equipment, originally standard IT equipment without video surveillance function, needs to be connected behind the server (the server is installed with video surveillance software). With the development of technology and the integration of surveillance and IT, the industry has gradually formed CVR central-level video network storage devices with different functions by removing the intermediate servers and directly installing various security video surveillance software modules on IPSAN/NAS network storage devices.

In the case of a poor CVR network, you only need to try to establish a session connection, and the reconnection process takes a very short time; IPSAN is likely to cause connection interruption when the network is poor, and the front-end and storage have to constantly try to remount the connection, which is costly. Sometimes it is easy to lose videos. The CVR storage mode can support video streaming through the encoder and directly written to the storage device, saving the cost of the storage server, avoiding the single point of failure and performance problems of the server, and ensuring the high stability and high performance of the monitoring service.

The iSEMC NP Pro controller supports CVR access, the default configuration CVR supports 8T and below hard disks as video disks, and supports hard disk dynamic detection, supports graphical RAID5 configuration, supports plan/video/alarm linkage video configuration (supports recording audio); supports local Export the backup video, support retrieval and tracking by type/date/time, support restart termination/pause/single frame/capture, support product combination use, unified management/operation.

For more functions, please click isemc CVR

HDMI, High Definition Multimedia Interface is a fully digital image and sound transmission interface, which can transmit uncompressed audio and video signals.

The HDMI interface can provide up to 5Gbps data transmission bandwidth, and can transmit uncompressed audio signals and high-resolution video signals. At the same time, there is no need to switch before the signal transmission, which can ensure the highest quality video and audio signal transmission. The advantage of using HDMI is: only one HDMI cable is needed to transmit video + audio signals at the same time, unlike AV or RCA multiple cables to connect; at the same time, because there is no need for digital/analog or analog/digital conversion, more High audio and video transmission quality. For consumers, HDMI technology not only provides clear picture quality, but also greatly simplifies the installation of home theater systems because the audio/video uses the same cable. The HDMI interface supports the HDCP protocol, laying a foundation for watching copyrighted HD videos.

Compared with the previous digital video interface dvi, it has an absolute advantage. 

1. HDMI can transmit digital video and audio signals at the same time, just use one cable, DVI can only transmit digital video signals, and transmit audio signals can only use other interfaces and cables
2. HDMI can transmit high-definition digital video signals, and the video effect is better than DVI
3. HDMI transmission rate is faster than DVI (higher)
4. HDMI transmission distance is farther than DVI under the premise of ensuring no distortion, HDMI cable can be up to 15 meters long, and DVI can only reach 8 meters

5.HDMI interface volume is smaller than DVI

6. HDMI is compatible with DVI, the video signal can be connected to the DVI interface through the conversion interface
7. HDMI is used on monitors that can display both video and sound (such as LCD TVs). DVI can only be used on a single monitor.

Therefore, from any angle, HDMI cabe will gradually replace DVI and become the most common interface type in the project.

Check the HDMI cables for ismec video wall controller