Talk about the low degree and broad dynamics of the network monitoring camera

In recent years, network monitoring cameras have completely broken the tranquility of the security market and gradually accepted and recognized by users. At the same time, online surveillance continued to lead the video field in 2017 to become a new selling point. All of this achievement can be attracted to the IP camera -based and mature network environment. Due to the fierce competition of major security manufacturers in the world, the Internet monitoring market has increased its burden.

Each manufacturer wants to design a different product, but how many monitoring cameras have a flashy function? After continuous research and development and improvement, it seems that many manufacturers are inclined to pay attention to low -illumination and broad dynamic functions of network surveillance. What are the magic of these two functions, let’s take a look together.

Security surveillance lens and internal supermarket as the background

Night -view low -light, color monitoring in the environment

Low -shine monitoring is a monitoring camera’s ability to capture colored images in a weak light or lightning environment. The performance of low -light cameras is highly dependent on its sensor sensitivity and DSP processing capacity, followed by and based on variable aperture and shutter velocity to form different combinations to obtain clearer images.

The iris night vision monitoring is different. It can control the light transmittance of the lens and the sensor, and the need for light sources needed to the camera. Through cooperation, adjust the light input of the surveillance camera. New thermal imaging technology and high -resolution lenses are conducive to improving the overall sensitivity of the camera, which will further improve the imaging effect of low -illumination cameras.

Increased monitoring performance in the low -illumination environment

When the environmental light turns dark, the day and night monitoring the camera will automatically switch to the black and white mode. However, as the low -shine monitoring camera becomes more and more popular, it can not only provide night vision monitoring capture, but also distinguish the color. Even at night, the suspect can be recognized.

The low -shine camera is also crucial in the setting link, and there are special requirements for lighting in different environments. At present, in normal lighting environments, the most commonly used low -illumination surveillance camera can be used in 0.01LUX color image, and higher -level cameras can show color images in a lower light environment, such as 0.001LUX is not a problem.

3D digital noise reduction comparison

Today, the goal of security manufacturers is to provide clear color images under 0.0001LUX. Both have great challenges in technology and application. In this environment, it is difficult to distinguish whether there is a mobile goal. In addition, for low -illumination monitoring, there is currently no recognized standard to measure whether the product meets the standard.

Each manufacturer has its own different detection standards, resulting in the differences in the performance of different brands of camera. In addition, another challenge facing the low -shine monitoring camera is the noise reduction problem of the image. There will be a lot of noise in night vision color imaging, and tens of thousands of SLR digital cameras cannot avoid this problem. Therefore, the low -illumination camera supports digital noise reduction function to further improve the quality of image.

谈谈网络监控摄像机的低照度与宽动态

WDR wide dynamic monitoring

Almost all monitoring cameras have a broad dynamic function, which seems to have become unwritten rules. Increasing width dynamics helps to solve the loss of image details in extreme lighting environments, such as indoor and outdoor light changes, resulting in some major image loss. The user must note that the wide dynamic range is defined as the brightest image and the darkest area of ​​the image. In different environments, this value will change, not an absolute value.

The most common form of WDR is to use multiple exposure methods, which include capturing two frames of images and a long exposure speed in a short time. The first exposure captures the details in the bright area scene, while the latter captures the details of the dark area in the scene. Then combine the two images together, which can present two image details in bright and dark areas at the same time.

Broad -dynamic function comparison

The most common broad dynamic range is between 50 and 70DB, and the advanced broad dynamic range is between 100 and 130DB. The most advanced broad dynamic range (also known as the third -generation wide dynamic) is called “real WDR”, which is compared by capturing four frame images to achieve the best results.

Compared with the previous two -frame wide dynamic range technology, the increase in frame number helps to solve the difference in lighting between the prospects and the background in the image.

Broad -dynamic actual measurement comparison

Although many manufacturers have boasted that the width dynamics of the surveillance camera have exceeded 130DB, in reality, if the camera width dynamic exceeds 120DB, its effect is already very considerable. Users must install cameras according to actual needs. Broad -dynamic devices are usually applied to parking lots, squares, construction entrances, ports, toll stations, etc. These places are often affected by changing light.

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