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2, clarity <br> The clarity of the camera is represented by lines, which are divided into horizontal lines and vertical lines. In practical engineering applications, we often use the horizontal line as the evaluation index of the camera clarity. The more lines, the higher the definition. . The resolution of commonly used black and white cameras is generally 450-600, while the resolution of color cameras is generally 330-480. The larger the value, the clearer the image. For general surveillance, a 450-line camera can meet the requirements. For special occasions such as medical and image processing, a 600-line camera can get a clearer image.
3. Automatic Gain Control (AGC)
In order to enable the camera to output a standard video signal under different illumination conditions, an automatic gain control (AutoGainControl) is introduced in the video processing circuit, and gain feedback control is realized by detecting the average level value of the video signal. Cameras with AGC function will increase the sensitivity in low illumination, but also amplify the interference signal, making the image look clutter.
4, backlight compensation (BLC)
When the camera is shooting in a backlight environment, a black image will appear on the screen. However, in the security, the backlight environment is difficult to avoid. At this time, backlight compensation is required. When the backlight compensation function is introduced, if the camera detects that the video level in a region of the captured image is relatively low, the video level of the region is improved and improved by the AGC circuit described above, and the amplitude of the output video signal is increased to make the image as a whole. Clear and bright. If the subject you want to see is dim due to the bright background, you can set the BLC to ON to compensate for the strong backlight.
5. Electronic shutter (EE/AI) switching <br> We can often see the EE/AI switch at the rear terminal of the camera. EE refers to the electronic shutter mode; AI refers to the automatic aperture lens mode. The electronic shutter of the camera is generally set to the automatic electronic shutter mode. The electronic shutter mode is used to adjust the exposure time of the CCD image sensor according to the intensity of the incident light, so as to obtain a clear image. The time of the electronic shutter is 1/50-1/100000. Between seconds.
6. Signal-to-Noise Ratio <br> Refers to the ratio of signal level to clutter level. The clutter includes power clutter, random clutter, and single-frequency clutter. It is often expressed in decibels (dB). The higher the signal-to-noise ratio, the less clutter it produces and the higher the image signal quality. The signal to noise ratio must not be lower than 48dB.
7, white balance (AWB)
To restore the color of the subject, the color camera must maintain the white balance normal.
Seven technical analysis of network cameras
[ Huaqiang Security Network News ] Network cameras have been in the security market for a long time, and there are also great breakthroughs in technology. The network camera technology can be divided into seven steps: resolution, resolution, and automatic gain control. AGC), backlight compensation (BLC), electronic shutter (EE/AI) switching, signal-to-noise ratio, white balance (AWB) 1. Resolution <br> Image resolution is simply the number of points displayed in the horizontal direction and direction of the screen. For example, 1024×728, where “1024†represents the number of dots displayed in the horizontal direction on the screen, and “768†represents the number of dots displayed in the vertical direction. The higher the resolution, the sharper the image. The higher the resolution, the clearer the display of the image.