Security camera in the end can "see how far"?
2024-01-27 04:07:20
In practical applications, users are often asked to ask questions such as how far a camera can “see how farâ€, such as whether objects 100m, 500m or even 1km away can be clearly displayed on the monitor.
The question of how far you look is related to many factors. For example, a definite focus lens can be used to see the denomination of a stamp 100 meters away. In general, the longer the focal length of the lens, the farther it “seesâ€, but at the same time the viewing angle becomes smaller, and the scope of the viewing becomes narrower. To take a simple example, if you use a standard lens to just look at the basic characteristics of someone in the distance (male or female), then changing to a long-focus lens may look at the facial features (whether there is a flaw or a flaw), but Can not see what the person is wearing pants and shoes (this part has been "up" out of the picture), and switch to a wide-angle lens can only see someone in the picture (even men and women are not distinguishable), but can see the People are located in the entire surveillance scene and there are other characters or reference objects around. Therefore, the more scientific view of “seeing how far†should be “the image size on the screen can correspond to how high or wide the scenery is at the actual observation distanceâ€. For example, using an 8mm lens to observe a scene at a distance of 10m, if there are 10 people standing in a row, it can just fill the entire monitor screen horizontally.
The question of how far you look is related to many factors. For example, a definite focus lens can be used to see the denomination of a stamp 100 meters away. In general, the longer the focal length of the lens, the farther it “seesâ€, but at the same time the viewing angle becomes smaller, and the scope of the viewing becomes narrower. To take a simple example, if you use a standard lens to just look at the basic characteristics of someone in the distance (male or female), then changing to a long-focus lens may look at the facial features (whether there is a flaw or a flaw), but Can not see what the person is wearing pants and shoes (this part has been "up" out of the picture), and switch to a wide-angle lens can only see someone in the picture (even men and women are not distinguishable), but can see the People are located in the entire surveillance scene and there are other characters or reference objects around. Therefore, the more scientific view of “seeing how far†should be “the image size on the screen can correspond to how high or wide the scenery is at the actual observation distanceâ€. For example, using an 8mm lens to observe a scene at a distance of 10m, if there are 10 people standing in a row, it can just fill the entire monitor screen horizontally.
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