1. Sharpness Measurement: When testing with multiple high-speed dome cameras, 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 sides of the monitor screen. Clearly and accurately counted 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 lines are horizontal 800 lines. 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's best to use both, and you can see the difference in this high-speed dome camera (for far and near convergence).
2. High-speed dome camera color reproduction test: test this parameter should choose a good color monitor. First, observe the characters and costumes from a distance to see if there is any color distortion. Compare the objects with bright colors. Look at the sensitivity of the high-speed dome camera. Take the color album in front of the high-speed dome camera. See the picture clearly and clearly. Again, take pictures of moving colored objects to see if there are color trails, delays, blurs, etc. The test conditions such that the maximum illuminance of the camera at 50V should be measured under the condition of 50+10V illumination, that is, ten volts is added to the highest illumination of each high-speed dome camera, and the aperture should maintain the closest state.
3. Illumination: Place the high-speed dome camera in the darkroom, before and after the darkroom, use an active 220V self-firing lamp, place a voltage regulator, and adjust the darkness of the dark interior light with the voltage regulator 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 speed dome of the high-speed dome camera is set to the maximum during the test, the next lowest illumination value is recorded (the dimming of the active lamp regulator is darkened so that the screen cannot be cleared). When the aperture is at a minimum, the next minimum illuminance value is recorded, and the front and rear lamps can be individually adjusted for pressure and light.
4. High-speed ball camera backlight compensation: There are two methods to test this parameter: one is in the dark room, the front of the high-speed dome camera is turned on, adjust the brightness to the brightest, and then place a picture or text below the lamp. , High-speed dome camera to meet the light camera, to see whether the image and text can be seen, the picture is not harsh glare, 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. Distortion of high-speed dome camera: Look at the distortion of high-speed dome camera. Place the test card at the front of the camera to make the whole sphere appear on the screen. Look whether the sphere has an ellipse. Move the camera forward to see whether the center of the circle is enlarged or not. Whether the edges, corners, boxes have arc distortion.
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