Analysis of the technology of HD network camera
HD cameras, as the name implies, require cameras with higher resolution. Before starting the technical discussion, we take a clear definition of the HD camera, a surveillance star. This leads to the topic we are discussing today. What is the core of the HD camera and what kind of solution meets this core key requirement to meet market demand.
As a collection terminal, the camera is the cornerstone of our video surveillance and is an extension of our eyes. In the era of standard definition, after more than 20 years of development, CCTV has developed to the extreme, regardless of the cost of analog cameras, the effect has reached the best price/performance ratio. However, in the high-definition era, due to the technological changes in the sensor industry, due to the increase in the amount of high-definition video data, new challenges in camera acquisition and transmission have arisen. This is also the core of our HD camera development and production: how to dock a variety of high-definition sensors, and debug image quality that meets the monitoring needs, and how to solve the video transmission problem of HD network cameras.
The first question is how to dock various HD sensors and debug the image quality that meets the monitoring needs.
This is the common key to all HD camera solutions. On the one hand, the high-definition sensor is switched from CCD technology to CMOS (this is determined by many aspects such as process and cost). In addition, various CMOS sensor manufacturers do not provide a dedicated ISP (CCTV era Called DSP), the ISP module must be purchased separately, which leads to the development and production of a high-definition camera. The technical requirements for docking sensor+ISP are relatively high.
At present, many sensor companies (SONY, panasonic, aptina, omnivision, sharp, Altasens, etc.) have launched high-definition CMOS solutions, but in addition to SONY has its own ISP (ISP: Image Signal Processor), other companies are independent. The Sensor needs to be configured with an ISP outside, but because of the high-definition monitoring, there are few independent ISP solutions, and there is still lack of flexibility in docking various sensors, not to mention the negative factors such as cost and sensor board size. So a good ISP solution is the key to solving the problem of HD camera effects.
Wide dynamics, color reproduction, noise reduction, low illumination and other factors are the key to affecting image quality. In different application environments such as intelligent transportation, finance, and safe city, people have different requirements for high-definition cameras. CMOS sensor processing effects and CCD Compared with some differences, the ISP's processing is a guarantee for the adaptation of various application scenarios.
When designing Hi3516, a high-definition network camera chip, Haisi decided to embed the ISP system in the chip considering the final system cost, power consumption, and effect debugging. The module was designed with each other at the beginning. The sensor factory closely cooperates with the technical roadmap and carries out targeted technical design for the characteristics of each sensor. Various image processing techniques such as dead pixel correction, 2D/3D noise reduction, 3A processing, WDR, low illumination, edge enhancement, digital image stabilization, dynamic contrast enhancement, and the like. The application of these technologies has corrected some of the shortcomings of the sensor and can effectively improve the HD effect. Haisi ISP has successfully docked with the above-mentioned sensor manufacturer's high-definition sensor, which has greatly solved the customer's investment in this aspect. In particular, the sensor companies' interfaces are different, matching in advance, reducing the peripheral FPGA transfer, and improving the customer's TTM. It also reduces the cost of customer BOM.
The 3A algorithm is the basic indicator for testing ISPs. While providing an appropriate 3A algorithm for customers, HiSile ISP also provides a replaceable platform for companies with their own 3A processing algorithms, while reducing the threshold of the entire industry. Different companies are provided with differentiated protection. After all, the demand in each market segment is different. There is no single algorithm that can satisfy all markets. It is also a realistic need for each family to adjust their 3A according to different manufacturers.
First of all, the wide dynamic effect is the hotspot of various application scenarios, and it is also an important propaganda focus of each sensor. HiSili's Hi3516 wants customers to think about it, introducing two wide dynamic modes, one for all sensor general algorithms. In addition, it is aimed at an algorithm like aptina with HDR-specific technology. The two wide dynamic algorithm applications enhance sensor selectivity on the one hand, and provide convenience for customers to seek more differentiation.
Universal wide dynamic algorithm to close the contrast (left-on, right-off)
Noise is a video taboo, especially the CMOS technology itself and the CCD are somewhat different in the noise caused by insufficient light, which greatly affects the HD experience. Haisi ISP has two modules, 2D and 3D, which have a great improvement in noise reduction.
3D noise reduction switch contrast (left-on, right-off)
In addition to the ISP and sensor pairing algorithm, how to debug is actually the key. Because the layout of the sensor board is different, it will directly affect the final effect of the sensor. Therefore, we need to debug the sensor and ISP. Because of the thousands of registers of the sensor, On various combinations, it is very difficult to debug a result that meets the needs. Haisi takes into account the industry efficiency problem and provides you with a PC directly using IPS TOOLS. This tool combines various effects adjustments and register combinations through various algorithms. Correlation avoids the pain of the client to adjust the register as soon as it comes up. At the same time, the customer can debug the register according to his own experience, keeping the common scene and special application. So the status of ISP and ISP tools is equally important.
Here, in order to avoid the advertising of HiSilicon, we have not carried out the effects of various algorithms one by one. It is worth mentioning for the peers to share some of the precautions in the image quality of our selected HD camera solution. It also provides the algorithm effect for everyone to choose the key ISP, ISP debugging tools.
Dutch net is generally used by people as a guardrail, because it has the advantages of simple design structure, scientific design principles, affordable price, convenient installation, etc., so it is deeply loved by people.
specification
Net width: 0.5m-2.5m; 2. Before coating (wire diameter) After coating: 1.0-3.0 (mm).
Aperture: 60 * 60, 50 * 50, 50 * 100. 3. Length: 30m
Common specifications:
Common product specifications:
Wire diameter size: 2.5mm
Mesh size: 1.8x30m 1.5mx 30m 2mx30m 1.2 * 30m
Mesh size: 50 x 50mm 50mmx100mm 600x600mm
Net pillar height: 1.2m 1.5m 1.8m 2.0m 2.3m
Mesh post spacing: 3m-4m
Overall color: dark green grass green dark blue orange yellow
Dutch net post: Dutch net post: Generally made of iron pipe with a diameter of 48mm, the end column is pressed with 60 tubes. Because its pressed shape resembles a dovetail, it is also called: dovetail post. The length of the Dutch net pillars are: 1.5m, 1.8m, 2.1m, and 2.3m, and the general thickness is: 0.8mm / 1.0mm / 1.2mm. The 1.5mm pillar is accompanied by a pillar cap, a buckle that connects the pillar to the mesh, and a special Tool pliers.
Holland Net has good anti-corrosion performance, anti-aging, beautiful appearance. Installation is quick and easy. Can be widely used in industrial, agricultural, municipal, transportation and other industries fence, decoration, protection and other facilities. It has the characteristics of good filtering accuracy, high load intensity, low cost and easy installation.
Stainless Steel Dense Network,Stainless Steel Filter Sieve Mesh,Wire Filter Network,Dutch Weave Mesh Screen
Jieyang Xinxin Industry and Trade Co., Ltd. , https://www.gdxxgm.com