Magnetic Level,Magnetic Level Gauge,Magnetostrictive Level,Float Level Gauge Wuxi Winsun Automation Instrument Co., Ltd , https://www.jswxwinsun.com
The similarity of products and the lack of exquisiteness and refinement are the experience of participating in the evaluation of many manufacturers. It is not how much our research and development capabilities are so poor, but they are not elaborate and refined, which means that details determine success. This is the last point, which has achieved the final clear presentation of high-definition, the details of which are as follows for specific products:
HD camera
The lens is easily overlooked, and it is precisely the matching of the lens and the camera that determines the display of high-definition pixels, especially the edge resolution. For high-speed domes, the built-in zoom lens is also the main cause of the effects, especially the auto focus at auto tracking, and the setting of macro focus, etc. Many manufacturers do not set this function in software. The poor matching of the zoom lens also causes the sharpness to decrease.
The design of low illumination and day and night conversion is an extended performance for the day and night conversion function. The main difference is that the conversion threshold is different, and the conversion effect is not good. Most cameras begin to convert between day and night around 8-10 Lux, but none of them are designed with a regulating valve. The value of the function, especially the ball machine is even more so, should set the automatic threshold setting function for the four seasons can improve the clarity. This feature is especially effective for large systems.
ISP processing chip in the sharpness of the lifting process and noise suppression balance considerations: Many manufacturers in improving the clarity, but also raise the noise accordingly. For the image quality, sharpness is also an important part to be considered. At the same time, the edge sharpness and layering of the image are also the main sensory indexes that measure the quality of the image. Therefore, manufacturers should consider it comprehensively. In the actual test, the improvement of the sharpness is often encountered but the others are neglected. The actual perception effect is not good.
Rear focus adjustment and installation considerations: such as the back of the focal adjustment of the structural design and fine-tuning the accuracy, ease of seating and lifting are easily overlooked in the design.
In addition, front-end lightning protection is also included.
Finally, the position of the product R&D manager is critical. The R&D manager in the early stage of product development shall make corresponding suggestions to the electrical engineer, structural engineer, and software engineer for the major functions, operations, convenience, and actual engineering needs of the product. To prevent R&D personnel from having problems with closed doors.
SDI matrix
SDI matrices are used in large systems in practical applications. The transmission distance of common SDI cameras is about 100 meters, and the transmission distance of SDI cameras of large-scale monitoring systems is far beyond 100 meters, so matrix input compensation is particularly important. Remote management and multi-level cascading control are important parts of the network. The hybrid access model is also an important technical issue of the SDI matrix. At present, there are multiple modes for cameras used in different situations, such as traditional analog cameras, IP cameras, HD-SDI cameras, etc. Each type of camera also contains multiple formats, so the compatibility of multiple types of cameras is also a technical difficulty of the SDI matrix. In particular, there are similar problems in the upgrading of the old system and the construction of the “Safe Cityâ€. The architecture of software management platform and the management of data storage are also the difficulties of SDI matrix technology. For the "Safe City" level system, the SDI matrix software management platform, storage management and optical fiber access have become necessary technologies.
With the emergence of large-scale construction projects such as “Safe Cityâ€, the matrix network cascading system consists of a central matrix and multiple matrixes of nodes. Each matrix has an independent IP address and exchanges data through the Ethernet port. The node matrix uploads the local video output to the center matrix, and the center matrix can switch and control the images of all the node matrix cameras. By adding the central matrix to the video downlink channel of the node matrix, each node matrix can implement interconnection and control and cross-regional scheduling. After the high-definition matrix, whether it is networking or stand-alone operation, retains the original convenient switching control, image inspection positioning and other functions, such as alarm linkage, group switching and so on. Therefore, the technical development of the SDI matrix must be toward the development of metropolitan area, network, integration, fiber optics, digitization and wide compatibility. Unicom can be accessed for legacy systems. And can be based on the SDI matrix software management platform under the storage, control, communications, images, early warning and other unified management, to achieve the full range of digital * function.
However, when many manufacturers are researching and developing, they have to go back to the thinking of the development period of the simulation matrix. They do not inherit many powerful functions and various advantages of hardware and software in the existing simulation matrix, wasting manpower and material resources.
HD-SDIDVR
High-definition data storage and management device HD-SDIDVR came into being with the widespread use of high-definition HD-SDI cameras. It integrates the advantages of two different types of storage devices, DVR and NVR. HD-SDI cameras are suitable for long distance HD signal transmission between large devices. Therefore, the HD-SDIDVR device's uncompressed, low-latency, and easy-to-install features are particularly prominent. It combines the advantages of analog uncompression and real-time, and combines the convenience of digital HD management applications for network products. However, it still uses the H.264 compression mode for data storage and management. The resulting playback will still be at the expense of clarity.
For HD-SDIDVR products, it is better to display in HD-SDI mode as much as possible during real-time display. How to use SDI mode for multi-screen split synthesis instead of H.264 compression (this method will affect HD Actual effect) The processing of several digital videos and processing them into multiple pictures and then combining them in real time to display in a single screen (including single screen display) will become the direction for future research. However, DVRs using multiple loop-through HD-SDI image output formats are rarely seen. For the compression and storage processing in the previous H.264 mode, the resolution of the decompressed image is also at the cost of reduced resolution. As we all know, HD-SDI camera transmission data can reach up to 1485Mbps lossless 1080P high-definition digital video signal, the general transmission format also uses 1920 × 1080 (1080P), so how to do not reduce the high-definition data signal quality, to achieve storage and display of high-definition The effect has become the main subject of research and development of HD-SDIDVR manufacturers in the future. Otherwise, the HD of the HD-SDI camera brings only real-time display effects, and the playback of the HD-SDIDVR and browsing through the web also reduce the clarity of the SDI image. In order to solve the bottleneck of the network, most of the current network browsing uses the 4-8M bandwidth storage mode and streaming media technology to transmit to the client. However, at any cost, it is at the expense of clarity. Even if the front-end uses an HD-SDI camera, it is difficult for the ultimate client to achieve high-definition results. Therefore, how to solve the final display HD problem is also future. The main direction of the manufacturer's R&D.
SDI optical transceiver
The digital signal optical fiber transmission has only two states of “light†and “no light†in the optical fiber, so the linearity requirement of the light source is not high, thereby avoiding the loss of the signal during processing. In addition, digital SDI optical transceivers are relatively easy to implement mixed transmission of multiple channels and multiple signals. With TDM technology, multi-channel and multiple signal transmission can be easily implemented.
The characteristics of the main electrical signal technical parameters of the SDI optical transceiver are: transmitted signal: voltage swing of 800mV, rise and fall time less than 135ps, allowing some overshoot, but it cannot exceed 10%, ie 80mV. The standard parameters of clock jitter and adjustment jitter are timing jitter less than 1UI and school-time jitter less than 0.2UI. However, at present, certain products have some deviations from the parameters, which have a slight influence on the output of the remote receiver. Therefore, the design of the compensation circuit is required to be very precise and precise. After SDI signal transmission over long distances, the signal quality will be degraded. In order to compensate for the loss of long-distance transmission and reconstruct the amplitude of the video signal, an additional cable equalizer must be added, overshoot debugging and design, and precise adjustment of jitter design.
The front-end HD camera only shows the quality of the signal source, but after the transmission to the end device, the final processing capability and effect also determine whether it can display high-definition pictures. This last 100 meters is the world we need to win.
For the just-emerged HD-SDI technology, many domestic related manufacturers just developed corresponding external hardware and software platforms on the basis of this chip, combined with domestic and foreign technology, and independently developed a new generation of products. How to improve the technical capabilities of products on this basis has become a real problem.