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First, the resolution refers to the maximum number of lines that can be seen on a monitor (which should have a higher resolution than the camera) when the camera takes equally spaced black and white lines. When the line exceeds this number, the screen You can't tell the black and white stripes. The resolution of general resolution is generally 350 TVL line (horizontal center), and the resolution of high resolution is generally 480 TVL ((horizontal center).
Second, the sensitivity It is a reflection of the camera's photoelectric conversion performance of a high and low indicators. At present, the sensitivity of the CCD camera used in the monitoring system is measured with the minimum illuminance. The lower the illuminance, the higher the sensitivity and the better the photoelectric conversion performance. At present, the minimum illuminance of a general color CCD camera can reach 1 Lux, black and white can generally reach 0.1 Lux, and low illumination can reach 0.01 Lux.
Third, the signal-to-noise ratio refers to the ratio of the signal voltage to the noise voltage. It is usually expressed by the symbol S/N and the unit is dB. The signal-to-noise ratio given by the general camera is the value when the AGC (automatic gain control) is turned off. The typical value of the CCD camera signal-to-noise ratio is generally 45 to 55 dB, and the engineering application requires ≥40 dB. When used in low-light systems, the signal to noise ratio must not be less than 25dB.
4. Color reproduction degree The color reproduction degree refers to the degree of difference between the target color and the actual color of the object after being processed by the CCD camera. Color is divided into hue and saturation, hue determines the nature of color, saturation determines the shade of color. Our image judgment standard for color is 100-0-75-0 color bar. It should be noted that the degree of color reduction has a very close relationship with the illumination conditions of the scene and the color temperature of the light source. In the current monolithic color CCD type, the device theoretically cannot reproduce the original object's color completely and truly.
5. White Balance White Balance is an important parameter of the color camera. It directly affects the color effect of the reproduced image. When the white balance of the camera is not correct, the color cast phenomenon will appear when the camera reproduces the image. Colored objects such as white walls are also colored. Generally, the phenomenon that the red, green, and blue primary color signal voltages VR=VG=VB output when the camera shoots a white scene is called white balance.
For the camera, its main performance indicators are: resolution, sensitivity, signal to noise ratio, color reproduction characteristics and automatic functions.