With the drive of our government policies, the innovation of new and high technologies, and the shift in demand for video surveillance, China will usher in another round of prosperity in the video surveillance market. (1) With the implementation and implementation of China's safe city construction and smart city construction policies, the video surveillance market should gradually extend from first-tier cities to second- and third-tier cities, extending from coastal developed regions to remote areas in central and western regions. (2) With the rapid development and maturity of computers, the Internet, and coding technologies, high-definition, intelligence, and networking are inevitable trends in the development of security video surveillance equipment technologies. (3) security from equipment to solutions to data services, from meeting general needs to customizing requirements to proactively creating demand and value. (4) With the improvement of people's living standards, the strengthening of safety awareness, and the intelligence of home products, home security and smart homes will become an important part of civil security.
Measurement of sharpness
When testing multiple surveillance cameras, the same lens should be used. The center circle of the test card appears on the right and left sides of the monitor screen. Clearly and accurately, the number of the given ticks is 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).
Color reproduction test
Test this parameter should choose a good color monitor. First, observe people and clothes from a distance to see if there is any color distortion, compare the vividness of objects, and look at the sensitivity of the surveillance camera. Take the color picture book in front of the camera and see the picture clearly outlined, too light or too thick, and then respond again. Take a picture of colorful objects in motion to see if there are color trails, delays, or blurs. 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, 10V on the basis of the most illuminance of each camera, and the aperture should maintain the closest state.
Illumination
Put the surveillance camera in the dark room, before and after the dark room is an active 220V incandescent lamp, set a pressure regulator at the place, adjust the voltage of the dark room lamp with the regulator 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 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.
Backlight compensation
There are two ways to test this parameter: one is in the dark room, turn on the front of the surveillance camera, adjust the light to the brightest, and then place a picture or text under the lamp to watch the video camera and watch it. Whether the image and text can be seen, the picture is not dazzling, and adjust the AL, AX gear switch to see if there is any change, which kind of 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.
Ball distortion
To see if the ball is distorted, place the test card at the front of the surveillance 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, angles, and frames at a distance. There is no arc distortion and so on.
power consumption
Minimum operating voltage, use a multimeter to measure current, and use a small regulator to adjust the voltage.
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