Surveillance cameras are used as security cameras. Their pixels and resolution are higher than the computer's video heads, but not with professional digital cameras or dv. Surveillance cameras are just a single video capture device that does not have data storage capabilities.
The test camera is mainly tested for resolution and color reproduction, illumination, and backlight compensation. The next step is to measure the distortion, power consumption, and minimum operating voltage of the surveillance camera. First, the measurement of the resolution and color reproduction, and illumination and backlight compensation are performed. introduce.
1. Measurement of sharpness :
When multiple surveillance cameras are used for testing, the same lens should be used (recommended for fixed focus and two variable lenses). The center circle of the test card appears on the left and right edges of the monitor screen. Clear and accurate numbers are given. The ticks consist of 10 vertical lines and 10 horizontal lines. Represents vertical resolution and horizontal resolution, respectively, and the corresponding set has given the number of lines. For example, the vertical 350 line level 800 line, at this time it is best to use a black and white monitor. The test can focus on distant objects or focus on the edge. It is best to use both, and you can see the differences in this camera (for far and near convergence).
2. Monitoring camera color reproduction test :
Test this parameter should choose a good color monitor. 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 10V on the basis of the maximum illumination of each surveillance camera, and the aperture should maintain the closest state.
3. Illumination :
The surveillance camera is placed in a dark room. Before and after the dark room, there is an active 220V self-firing lamp. A voltage regulator is provided at the place where the voltage regulator adjusts the voltage generation to adjust the brightness of the dark room lamp. The voltage can be adjusted from 0V 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 minimum 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. Surveillance camera backlight compensation :
There are two methods to test this parameter. One is in the dark room. Turn the front lamp of the camera on and adjust it to the brightest. Then place a picture or text under the lamp to watch the camera and watch the image. And whether the text can be seen, the picture is not dazzling, and adjust the AL, AX gear switch to see if there is any change, which effect is best. The other is to take the camera out of the window when the sun is shining. At this time, you can see if the image and text are clear.
5. Surveillance camera distortion :
Look at the distortion 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 whether the edges, corners, and boxes have arcs. Shape distortion and so on.
6. Surveillance camera power consumption :
The minimum operating voltage, the use of a multimeter to measure the current, using a small voltage regulator to adjust the voltage to see the security system, the image generation is currently mainly from the CCD camera, CCD is the charge coupled device (chargecoupleddefinition) abbreviation, it can turn light into a charge The charge is stored and transferred, and the stored charge can also be taken out to change the voltage. Therefore, it is an ideal camera component. The CCD camera constructed by it has a small size, a light weight, is not affected by a magnetic field, and has a shock-resistant east and impact. Characteristics are widely used.
The test camera is mainly tested for resolution and color reproduction, illumination, and backlight compensation. The next step is to measure the distortion, power consumption, and minimum operating voltage of the surveillance camera. First, the measurement of the resolution and color reproduction, and illumination and backlight compensation are performed. introduce.
1. Measurement of sharpness :
When multiple surveillance cameras are used for testing, the same lens should be used (recommended for fixed focus and two variable lenses). The center circle of the test card appears on the left and right edges of the monitor screen. Clear and accurate numbers are given. The ticks consist of 10 vertical lines and 10 horizontal lines. Represents vertical resolution and horizontal resolution, respectively, and the corresponding set has given the number of lines. For example, the vertical 350 line level 800 line, at this time it is best to use a black and white monitor. The test can focus on distant objects or focus on the edge. It is best to use both, and you can see the differences in this camera (for far and near convergence).
2. Monitoring camera color reproduction test :
Test this parameter should choose a good color monitor. 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 10V on the basis of the maximum illumination of each surveillance camera, and the aperture should maintain the closest state.
3. Illumination :
The surveillance camera is placed in a dark room. Before and after the dark room, there is an active 220V self-firing lamp. A voltage regulator is provided at the place where the voltage regulator adjusts the voltage generation to adjust the brightness of the dark room lamp. The voltage can be adjusted from 0V 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 minimum 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. Surveillance camera backlight compensation :
There are two methods to test this parameter. One is in the dark room. Turn the front lamp of the camera on and adjust it to the brightest. Then place a picture or text under the lamp to watch the camera and watch the image. And whether the text can be seen, the picture is not dazzling, and adjust the AL, AX gear switch to see if there is any change, which effect is best. The other is to take the camera out of the window when the sun is shining. At this time, you can see if the image and text are clear.
5. Surveillance camera distortion :
Look at the distortion 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 whether the edges, corners, and boxes have arcs. Shape distortion and so on.
6. Surveillance camera power consumption :
The minimum operating voltage, the use of a multimeter to measure the current, using a small voltage regulator to adjust the voltage to see the security system, the image generation is currently mainly from the CCD camera, CCD is the charge coupled device (chargecoupleddefinition) abbreviation, it can turn light into a charge The charge is stored and transferred, and the stored charge can also be taken out to change the voltage. Therefore, it is an ideal camera component. The CCD camera constructed by it has a small size, a light weight, is not affected by a magnetic field, and has a shock-resistant east and impact. Characteristics are widely used.
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