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Color low-light surveillance camera advantage analysis

Nov 16, 2017

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Low-light camera:

Low-light solar 4g security camera refers to the solar 4g camera can still capture a clear image under low light conditions

Most low-light-weight solar 4g security cameras on the market now claim the minimum illumination of their color imaging up to 0.001Lux. In fact, in this illumination, the object in the monitoring picture can only see a little edge, the color information almost does not exist. Therefore, low-light camera in the actual application process need to solve a variety of monitoring environment problems encountered ...

In a scene with a large amount of infrared light, there is no way to achieve accurate white balance, so an ordinary color solar 4g camera has an infrared filter before the Sensor to filter the infrared light. Infrared cameras have a large amount of infrared light when the infrared light is on. At this point, infrared filters will certainly not be used to filter the infrared light. Only the all-transparent filter can be used and the image is switched to black and white.


After a period of rapid development, most of the security monitoring vendors tend to be more mature in the monitoring of conventional scenes (daytime), with a small difference but with night-vision effects varying. The low light environment at night is the need to focus on monitoring, at this time better reflect the true strength of the manufacturers. In the future, all manufacturers will invest more resources to research and enhance the camera low light effect. On the other hand, a good low-light effect is also a key consideration for the purchaser. It will be very helpful for monitoring and keeping evidence for 24 hours and for cracking down crime. This is also a key link in the bidding effect of video cameras in the future.

At present, the commonly used 24-hour surveillance cameras are mainly displayed in black-and-white image mode at night, but the cameras lose color information at night, the similarity between people, cars and vehicles, or other things is large. Will help to quickly identify the target. Low-light camera is to color images to monitor a variety of scenes to help quickly lock the target.


What is a low-light camera

Low-light solar 4g surveillance cameras, as the name implies, can be achieved in a very low light conditions can achieve clear color identification images, real-time continuous video camera. Low-light camera is generally divided into dark, moonlight, star-level, they are lighting for the 0.1Lux, 0.01Lux and 0.001Lux and below. With regard to the specific illumination requirements of low-light-intensity cameras, the CCTV industry does not have a uniform standard in terms of technical specifications. Therefore, it is currently not possible to define what the minimum illumination value can be called a low-light-intensity camera. And the minimum illumination and lens aperture size (F value), gain (AGC), infrared light switch status and other conditions are related, so comparing the different camera minimum illumination level in the same environment you need to compare the image effects. Now the mainstream of the market are claiming the color image of the camera the lowest illumination 0.01Lux below, but also indicate the test conditions: F (1.2), AGC on.


Advantages of low-light camera

Compared to ordinary light solar 4g security camera

Obviously the advantage of a low-light solar 4g security camera is its low-light characteristic, which enables clear color images even in poor lighting conditions.

Compared to infrared cameras

Compared with infrared cameras, the advantages of low-light camera is reflected in the following aspects:

Good stability

Infrared cameras need to add an infrared light, infrared light mainly LED infrared light, array LED infrared light and laser infrared light, and so on, their common feature is a large heat and short life. After the infrared light is damaged, the whole camera can not be used. Moreover, due to the large heat value and the high internal temperature of the camera, "temperature drift" of the electronic device may occur, affecting the stability of the entire camera.

The image is colored

In a scene with a large amount of infrared light, there is no way to achieve accurate white balance, so an ordinary color camera has an infrared filter before the Sensor to filter the infrared light. Infrared cameras have a large amount of infrared light when the infrared light is on. At this point, infrared filters will certainly not be used to filter the infrared light. Only the all-transparent filter can be used and the image is switched to black and white.


Image brightness is uniform

Infrared cameras on the market generally can only illuminate the central part of the entire image scene, resulting in the center of the image brightness is high or even overexposure, and the surrounding image is very dark or even black, also known as the "flashlight phenomenon." Some cameras claim to have solved the "flashlight phenomenon," but only reduced the power of the infrared light or reduced the brightness of the image based on the brightness of the image in the center of the area. The real problem of uneven brightness of the image is not solved.


No infrared out of focus phenomenon

The band of infrared light is longer than the band of visible light and there is a slight difference in the focus of color images and black and white images. As a result, the image was clear during the day without activating the IR lamp. When the IR lamp was turned on at night, the image was blurry and the detail loss was very serious. Some cameras now use the autofocus function to solve this problem, but they are not well suited due to the inherent drawbacks of the existing autofocus, such as being out of focus for a particular scene.

Current situation

Most low-light-weight solar 4g security cameras on the market now claim the minimum illumination of their color imaging up to 0.001Lux. In fact, in this illumination, the object in the monitoring picture can only see a little edge, the color information almost does not exist. Therefore, low-light camera in the practical application of the process need to solve a variety of monitoring environment problems encountered, need to apply different technologies to low-light monitoring, the camera in low light environment can still maintain the true color reproduction of the image The clarity of the image, the smoothness of the video, and the noise suppression performance provide users with true and smooth video surveillance information in low-light environments.

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