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. Sharpness measurement When comparing multiple cameras for test comparison, 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. The ticks consist of 10 vertical lines and 10 horizontal lines, representing 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 reproducibility test test This parameter should be selected 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 are as follows: The minimum illumination of the camera should be measured under the condition of 50+10V illumination at 50V, that is, 10V on the basis of the minimum illumination of each camera, and the aperture should maintain the closest state.
3. The illuminance places the camera in a dark room. Before and after the dark room, an active 220V self-firing lamp is provided, and a voltage regulator is provided to adjust the brightness of the dark room lamp by adjusting the voltage level of the voltage regulator. 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. There are two methods for back light compensation test: one is in the dark room, the front of the camera is turned on, the light is adjusted to the brightest, and then a picture or text is placed under the light to take the camera to the light and see Whether the image and text can be seen, the picture is not harsh, and adjust the BLC, NOR pull-out switch to see if there is a change, which is the 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. Ball Distortion Watch Ball Distortion Place the test card on the front of the camera so that the entire sphere appears on the screen. See whether the sphere has an ellipse or not. Move the camera forward to see if the center of the circle is magnified. Then test the edges, angles, and frames at a distance. There is no arc distortion and so on.
6. The power consumption is the lowest operating voltage. Use a multimeter to measure the current and a small regulator to adjust the voltage.
1. Sharpness measurement When comparing multiple cameras for test comparison, 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. The ticks consist of 10 vertical lines and 10 horizontal lines, representing 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 reproducibility test test This parameter should be selected 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 are as follows: The minimum illumination of the camera should be measured under the condition of 50+10V illumination at 50V, that is, 10V on the basis of the minimum illumination of each camera, and the aperture should maintain the closest state.
3. The illuminance places the camera in a dark room. Before and after the dark room, an active 220V self-firing lamp is provided, and a voltage regulator is provided to adjust the brightness of the dark room lamp by adjusting the voltage level of the voltage regulator. 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. There are two methods for back light compensation test: one is in the dark room, the front of the camera is turned on, the light is adjusted to the brightest, and then a picture or text is placed under the light to take the camera to the light and see Whether the image and text can be seen, the picture is not harsh, and adjust the BLC, NOR pull-out switch to see if there is a change, which is the 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. Ball Distortion Watch Ball Distortion Place the test card on the front of the camera so that the entire sphere appears on the screen. See whether the sphere has an ellipse or not. Move the camera forward to see if the center of the circle is magnified. Then test the edges, angles, and frames at a distance. There is no arc distortion and so on.
6. The power consumption is the lowest operating voltage. Use a multimeter to measure the current and a small regulator to adjust the voltage.
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