Video surveillance camera test procedure analysis
2024-03-15 06:08:34
The test camera mainly tests sharpness and color reproduction, illumination, and backlight compensation, followed by measurement of ball distortion, power consumption, and minimum operating voltage. The following first measurement steps for sharpness and color reproduction and illumination and backlight compensation introduce.
1. Measurement of sharpness When multiple cameras are used for testing, the same lens should be used (it is recommended to use 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 Count a total of 10 vertical lines and 10 horizontal lines for the given tick marks. 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. Color Reducing Test Test This parameter should be selected as a color monitor. First observe the 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 camera. Take the color picture book in front of the camera. Look at the picture clearly, too light or too thick, and respond to the motion again. The color objects are photographed for color smearing, lag, blur, etc. The test conditions such that the maximum illuminance of the camera at 50V should be measured under the condition of 50+10V illuminance, that is, plus ten volt on the basis of the most illuminance of each camera, and the aperture should be kept in the closest state.
3. Illumination The camera is placed in a dark room. Before and after the dark room is an active 220V self-firing lamp. A voltage regulator is provided at the place where the regulator adjusts the voltage generation to adjust the darkness 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 maximized during the test, the next lowest illuminance value is recorded (the active light regulator is dimmed to a position where the dark interior is not visible). Hit the minimum and then record the next minimum illuminance value.
4. Backlight compensation test There are two methods for this parameter: one is in the dark room, turn on the front lamp of the camera, turn it to the brightest, and then place a picture or text below the lamp to take the camera to the light To see if the image and text can be seen, the screen is not harsh, and adjust the AL, AX gear switch to see if there is a 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. Spherical Distortion Look at ball distortion 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. Then test the edges and angles at a long distance. , whether the box has arc distortion.
6, the lowest power consumption voltage, use a multimeter to measure the current, use a small voltage regulator to adjust the voltage.
1. Measurement of sharpness When multiple cameras are used for testing, the same lens should be used (it is recommended to use 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 Count a total of 10 vertical lines and 10 horizontal lines for the given tick marks. 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. Color Reducing Test Test This parameter should be selected as a color monitor. First observe the 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 camera. Take the color picture book in front of the camera. Look at the picture clearly, too light or too thick, and respond to the motion again. The color objects are photographed for color smearing, lag, blur, etc. The test conditions such that the maximum illuminance of the camera at 50V should be measured under the condition of 50+10V illuminance, that is, plus ten volt on the basis of the most illuminance of each camera, and the aperture should be kept in the closest state.
3. Illumination The camera is placed in a dark room. Before and after the dark room is an active 220V self-firing lamp. A voltage regulator is provided at the place where the regulator adjusts the voltage generation to adjust the darkness 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 maximized during the test, the next lowest illuminance value is recorded (the active light regulator is dimmed to a position where the dark interior is not visible). Hit the minimum and then record the next minimum illuminance value.
4. Backlight compensation test There are two methods for this parameter: one is in the dark room, turn on the front lamp of the camera, turn it to the brightest, and then place a picture or text below the lamp to take the camera to the light To see if the image and text can be seen, the screen is not harsh, and adjust the AL, AX gear switch to see if there is a 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. Spherical Distortion Look at ball distortion 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. Then test the edges and angles at a long distance. , whether the box has arc distortion.
6, the lowest power consumption voltage, use a multimeter to measure the current, use a small voltage regulator to adjust the voltage.
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