The camera lens is the most critical equipment of the video surveillance system. The quality (indicator) of the camera lens directly affects the overall index of the camera. Therefore, whether or not the camera lens is properly selected affects both the system quality and the project cost.
The lens is equivalent to the lens of the human eye. If there is no lens, no object can be seen by the human eye; if there is no lens, then the image output by the camera is a white one, and there is no clear image output. This is related to the principle of our home video camera and camera. It is consistent. When the muscles of the human eye cannot stretch the lens to its normal position, which is often referred to as nearsightedness, the scene in front of the eye becomes blurred; the cooperation of the camera and the lens also has a similar phenomenon when the image becomes unclear. , You can adjust the camera's back focus, change the distance between the CCD chip and the lens reference surface (equivalent to adjust the position of the human eye lens), you can clear the blurred image.
Selection technique based on the lens (1) the size of the imaging lens <br> <br> CCD camera should be consistent with the size of the target surface, as described above, there is one inch, 2/3 inches, 1/2 inch, /3 inch, 1/4 inch, 1/5 inch and other specifications.
(2) resolution of the lens <br> <br> described camera image quality index is inherent transfer function of the lens and the optical distortion, but support, the need to know only the spatial resolution of the lens, can be per mm The resolution of the number of black and white stripes is a unit of measurement. The formula is: Lens resolution N=180/frame height. Since the size of the CCD camera surface has been standardized, such as 1/2-inch camera, the target surface is 6.4mm wide and 4.8mm high, and the 1/3-inch camera is 4.8mm wide and 3.6mm high. Therefore, for a 1/2 inch format CCD target, the minimum resolution of the lens should be 38 pairs/mm. For a 1/3 inch format camera, the resolution of the lens should be greater than 50 pairs, the target of the camera. The smaller the face, the higher the resolution to the lens.
(3) the lens focal length and the angle of view <br> <br> first camera according to the distance to the target to be monitored, the lens focal length selected, the lens focal length f is determined, determines the target surface by the camera field of view.
(4) the amount of light or the amount of light through aperture <br> <br> lens and the focal length of the lens through the aperture ratio of measured to F marked on each lens is marked with its maximum value F, the amount of light It is inversely proportional to the square of the F-number. The smaller the F-number, the larger the aperture. Therefore, whether to use a manual iris or an auto iris lens should be selected based on the degree of light changes in the monitored part.
The lens is equivalent to the lens of the human eye. If there is no lens, no object can be seen by the human eye; if there is no lens, then the image output by the camera is a white one, and there is no clear image output. This is related to the principle of our home video camera and camera. It is consistent. When the muscles of the human eye cannot stretch the lens to its normal position, which is often referred to as nearsightedness, the scene in front of the eye becomes blurred; the cooperation of the camera and the lens also has a similar phenomenon when the image becomes unclear. , You can adjust the camera's back focus, change the distance between the CCD chip and the lens reference surface (equivalent to adjust the position of the human eye lens), you can clear the blurred image.
Selection technique based on the lens (1) the size of the imaging lens <br> <br> CCD camera should be consistent with the size of the target surface, as described above, there is one inch, 2/3 inches, 1/2 inch, /3 inch, 1/4 inch, 1/5 inch and other specifications.
(2) resolution of the lens <br> <br> described camera image quality index is inherent transfer function of the lens and the optical distortion, but support, the need to know only the spatial resolution of the lens, can be per mm The resolution of the number of black and white stripes is a unit of measurement. The formula is: Lens resolution N=180/frame height. Since the size of the CCD camera surface has been standardized, such as 1/2-inch camera, the target surface is 6.4mm wide and 4.8mm high, and the 1/3-inch camera is 4.8mm wide and 3.6mm high. Therefore, for a 1/2 inch format CCD target, the minimum resolution of the lens should be 38 pairs/mm. For a 1/3 inch format camera, the resolution of the lens should be greater than 50 pairs, the target of the camera. The smaller the face, the higher the resolution to the lens.
(3) the lens focal length and the angle of view <br> <br> first camera according to the distance to the target to be monitored, the lens focal length selected, the lens focal length f is determined, determines the target surface by the camera field of view.
(4) the amount of light or the amount of light through aperture <br> <br> lens and the focal length of the lens through the aperture ratio of measured to F marked on each lens is marked with its maximum value F, the amount of light It is inversely proportional to the square of the F-number. The smaller the F-number, the larger the aperture. Therefore, whether to use a manual iris or an auto iris lens should be selected based on the degree of light changes in the monitored part.
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