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Most of the explosion-proof cameras have bid farewell to the black-and-white era and turned to color. But does the use of full-color monitoring really apply to all environments? After the author's test found that the answer is not as perfect as expected.
Sensor color reproduction sensitivity
With the explosion-proof camera mainstream CCD and CMOS sensor, the two designs have a "natural" gap in sensitivity and color reproduction. The CMOS target surface is larger and can achieve higher resolution. After the light passes through, it can achieve fast response; while the CCD has strong infrared sensing capability. Color reproduction is good, because of differences in the material of the target surface, imaging differences will occur.
Analog explosion-proof camera built-in CCD sensor, taking into account the network HD high-definition camera HD image, the use of a CMOS sensor, in the same light conditions, in fact, the gap between the two is not large, with the resolution to make up for the impact of light, if the sensor is interchangeable, not It will change the fundamental composition of quality.
Black and white is clearer than color imaging
One of the problems that plagued the author is why black and white is clearer than color imaging. This depends on the actual monitoring environment to choose. Color imaging is generally 10 times the amount of black and white image information. Colors are suitable for identifying details of the scene. Black and white is more suitable for places with insufficient lighting or no lighting.
In addition to cloudy conditions, color imaging during the day can effectively determine the target object, plus wide dynamics and other functions, to a certain extent, highlight the subject. At night, the black-and-white mode is used. On the one hand, due to insufficient light, black and white imaging is more clear. On the other hand, night vision has more color noise, which affects the image quality. Only normal natural light can display a normal color image, infrared light is invisible, and normal color images cannot be displayed.
The meaning of night vision color images
For an ordinary night vision surveillance image, what is the meaning of color and black and white? In consideration of image clarity, black-and-white night vision imaging is better; considering the storage capacity, night vision is obviously more space-saving than black and white; taking into account the monitoring distance, it is clear that black and white is more dominant... if these are not what you are looking for, So I'm afraid you need to meet the following application.
Night vision surveillance color imaging needs to fill light
Under the premise of no extra light, night vision surveillance mostly adopts black and white mode, and its contrast effect is very obvious. However, the night-vision surveillance capture images are not all black-and-white images. Due to special requirements, the use of timely light-up equipment can also achieve color capture at night.
Take road monitoring as an example. Since the background color of license plates can be divided into different colors such as blue, yellow, black, and white, serious error will occur if black-and-white imaging is adopted. The camera that is responsible for capturing illegal surveillance at each intersection must be equipped with a fill light. The white LED fills the light to provide sufficient light sources, and to ensure light balance, there is a fill light on each side of the surveillance camera.
In fact, color images are not necessarily all-powerful, and night vision and black and white can still solve practical problems. In the absence of special requirements, the meaning conveyed is the same regardless of the use of infrared light or light-sensitive components in a low-light environment. Assigning on demand is the best solution.
Explosion-proof camera night vision effect black and white images better
According to explosion-proof camera manufacturers, Anli Technology, explosion-proof cameras are really a picky device. Supporting motion detection has become a must-have feature, so the requirements for light are even more puzzling. An explosion-proof camera that specializes in outdoor hazardous environments has different interpretations of light processing capabilities. During the day, color, black and white at night, and fog on cloudy days require a variety of treatments. The environment has a fatal effect on explosion-proof cameras.