Surveillance Camera Test Steps The test surveillance cameras are mainly tested for resolution and color reproduction, illuminance, and backlight compensation. The next step is to measure the distortion, power consumption, and minimum operating voltage of the surveillance camera. The following definition and color reproduction and illuminance, backlighting The compensation measurement step is introduced first.
1. Measurement of surveillance camera sharpness: When using multiple surveillance cameras, the same lens should be used (it is recommended to use fixed focus and two variable lenses). The test card center circle appears on the left and right edges of the monitor screen. , Clearly and accurately counted the number of vertical lines and 10 horizontal lines that have been given a total of 10 vertical lines, respectively, representing the vertical resolution and horizontal resolution, and the corresponding group has given the number of lines. The test can be focused on distant objects, and can also be focused while measuring. It's best to use both, and you can see the difference in this camera.
2. Test of color reproduction of surveillance cameras: The color monitor selected for this parameter should be selected. First, observe characters and costumes from a distance to see whether there is color distortion or not. Compare the objects with vivid colors. Look at the sensitivity of the surveillance cameras. Before taking the color pictures on the surveillance cameras, look at the pictures clearly, too light or too thick. Take color pictures of moving objects to see if there are color trails, delays, blurs, etc. The test conditions such that the maximum illumination of the camera at 50V should be measured under the condition of 50+10V illumination, that is, plus ten volts on the basis of the maximum illumination of each surveillance camera, and the aperture should maintain the closest state.
3. Monitoring camera illumination test: The surveillance camera is placed in a darkroom. Before and after the darkroom, an active 220V self-firing lamp is provided. A voltage regulator is set at the front and rear to adjust the darkness of the dark room lamp with a voltage regulator to adjust the voltage. 0V is adjusted to 250V. The indoor illumination can also be adjusted from the darkest to the brightest. When the camera's aperture is open to the maximum, the next lowest illuminance value is recorded during the test (the active light regulator is dimmed to a position that cannot be seen in the dark interior). Hit the minimum and then record the next minimum illuminance value.
4. Monitoring camera backlight compensation test: There are two methods to test this parameter: one is in the dark room, the front of the camera is turned on to adjust the light to the brightest, and then put a picture or text under the lamp, Surveillance cameras to meet the camera, to see if the image and text can see, the picture is not harsh glare, and adjust the AL, AX gear switch to see if there is no change, which effect is best. The other is to take the camera out of the window when the sun is shining. At this point, you can see if the image and text can be seen clearly.
5. Surveillance Camera Distortion Test: Look at the Surge of the Surveillance Camera Place the test card at the front of the camera so that the entire sphere appears on the screen. See if the sphere has an ellipse. Move the camera forward to see if the center of the circle is magnified and then test the distance. Whether the edges, corners, boxes have arc distortion.
6. Monitoring camera power consumption test: Minimum operating voltage, use a multimeter to measure the current, use a small regulator to adjust the voltage.
The use of surveillance camera The camera is a front-end device for monitoring the image of the site. It uses the area-array CCD image sensor as the core component, plus the synchronization signal generation circuit, video signal processing circuit and power supply.
The camera has the advantages of black and white and color. Since the black and white camera has the advantages of high resolution and low illumination, in particular, it can be imaged under infrared light, so in the television monitoring system, the black and white CCD camera still has a high market share. By the way, the cameras listed in the list of CCTV surveillance equipment are usually without the lens (except for the integrated camera). Therefore, in practical applications, the camera should be fitted with the actual environment and user requirements of the monitoring site. The use of the lens camera is very simple, usually as long as the correct installation of the lens, connecting the signal cable, power can work. However, in actual use, if you do not install the lens correctly and adjust the camera and lens status, you may not achieve the intended effect. Should pay attention to the lens and camera interface, whether it is a C-type interface or a CS-type interface (this must be remembered, otherwise it will most likely damage the camera's CCD chip when the C-type lens is directly screwed onto the CS interface camera).
When installing the lens, first remove the protective cover of the camera and the lens, then gently screw the lens into the lens connector of the camera and put it into place. For auto iris lenses, the lens control line should also be connected to the camera's auto iris interface. For motorized two-variable or three-variable lenses, as long as the lens is rotated, there is no need to correct its balance.
Adjust Lens Aperture and Focus Off Turn off the electronic shutter and backlight compensation on the camera, position the camera at the scene to be monitored, and adjust the aperture and focus ring of the lens to optimize the image on the monitor. If you use the camera in a place with a large variation in illumination, it is best to connect the auto iris lens and set the camera's electronic shutter switch to OFF. If the manual iris is selected, the camera's electronic shutter switch should be turned ON, and when the application site is brightest (when the ambient light is at the maximum), the lens aperture should be opened as large as possible and the image is still optimal, and the lens is adjusted. If you do not pay attention to opening the lens as much as possible when the light is bright, but it is relatively small, the electronic shutter of the camera will be automatically adjusted at a low speed. , so you can still form a good image on the monitor; but when the light is dimmed, because the lens aperture is relatively small, and the electronic shutter is already at the slowest (1/50s), the imaging at this time may be It's dark.
1. Measurement of surveillance camera sharpness: When using multiple surveillance cameras, the same lens should be used (it is recommended to use fixed focus and two variable lenses). The test card center circle appears on the left and right edges of the monitor screen. , Clearly and accurately counted the number of vertical lines and 10 horizontal lines that have been given a total of 10 vertical lines, respectively, representing the vertical resolution and horizontal resolution, and the corresponding group has given the number of lines. The test can be focused on distant objects, and can also be focused while measuring. It's best to use both, and you can see the difference in this camera.
2. Test of color reproduction of surveillance cameras: The color monitor selected for this parameter should be selected. First, observe characters and costumes from a distance to see whether there is color distortion or not. Compare the objects with vivid colors. Look at the sensitivity of the surveillance cameras. Before taking the color pictures on the surveillance cameras, look at the pictures clearly, too light or too thick. Take color pictures of moving objects to see if there are color trails, delays, blurs, etc. The test conditions such that the maximum illumination of the camera at 50V should be measured under the condition of 50+10V illumination, that is, plus ten volts on the basis of the maximum illumination of each surveillance camera, and the aperture should maintain the closest state.
3. Monitoring camera illumination test: The surveillance camera is placed in a darkroom. Before and after the darkroom, an active 220V self-firing lamp is provided. A voltage regulator is set at the front and rear to adjust the darkness of the dark room lamp with a voltage regulator to adjust the voltage. 0V is adjusted to 250V. The indoor illumination can also be adjusted from the darkest to the brightest. When the camera's aperture is open to the maximum, the next lowest illuminance value is recorded during the test (the active light regulator is dimmed to a position that cannot be seen in the dark interior). Hit the minimum and then record the next minimum illuminance value.
4. Monitoring camera backlight compensation test: There are two methods to test this parameter: one is in the dark room, the front of the camera is turned on to adjust the light to the brightest, and then put a picture or text under the lamp, Surveillance cameras to meet the camera, to see if the image and text can see, the picture is not harsh glare, and adjust the AL, AX gear switch to see if there is no change, which effect is best. The other is to take the camera out of the window when the sun is shining. At this point, you can see if the image and text can be seen clearly.
5. Surveillance Camera Distortion Test: Look at the Surge of the Surveillance Camera Place the test card at the front of the camera so that the entire sphere appears on the screen. See if the sphere has an ellipse. Move the camera forward to see if the center of the circle is magnified and then test the distance. Whether the edges, corners, boxes have arc distortion.
6. Monitoring camera power consumption test: Minimum operating voltage, use a multimeter to measure the current, use a small regulator to adjust the voltage.
The use of surveillance camera The camera is a front-end device for monitoring the image of the site. It uses the area-array CCD image sensor as the core component, plus the synchronization signal generation circuit, video signal processing circuit and power supply.
The camera has the advantages of black and white and color. Since the black and white camera has the advantages of high resolution and low illumination, in particular, it can be imaged under infrared light, so in the television monitoring system, the black and white CCD camera still has a high market share. By the way, the cameras listed in the list of CCTV surveillance equipment are usually without the lens (except for the integrated camera). Therefore, in practical applications, the camera should be fitted with the actual environment and user requirements of the monitoring site. The use of the lens camera is very simple, usually as long as the correct installation of the lens, connecting the signal cable, power can work. However, in actual use, if you do not install the lens correctly and adjust the camera and lens status, you may not achieve the intended effect. Should pay attention to the lens and camera interface, whether it is a C-type interface or a CS-type interface (this must be remembered, otherwise it will most likely damage the camera's CCD chip when the C-type lens is directly screwed onto the CS interface camera).
When installing the lens, first remove the protective cover of the camera and the lens, then gently screw the lens into the lens connector of the camera and put it into place. For auto iris lenses, the lens control line should also be connected to the camera's auto iris interface. For motorized two-variable or three-variable lenses, as long as the lens is rotated, there is no need to correct its balance.
Adjust Lens Aperture and Focus Off Turn off the electronic shutter and backlight compensation on the camera, position the camera at the scene to be monitored, and adjust the aperture and focus ring of the lens to optimize the image on the monitor. If you use the camera in a place with a large variation in illumination, it is best to connect the auto iris lens and set the camera's electronic shutter switch to OFF. If the manual iris is selected, the camera's electronic shutter switch should be turned ON, and when the application site is brightest (when the ambient light is at the maximum), the lens aperture should be opened as large as possible and the image is still optimal, and the lens is adjusted. If you do not pay attention to opening the lens as much as possible when the light is bright, but it is relatively small, the electronic shutter of the camera will be automatically adjusted at a low speed. , so you can still form a good image on the monitor; but when the light is dimmed, because the lens aperture is relatively small, and the electronic shutter is already at the slowest (1/50s), the imaging at this time may be It's dark.