What is the minimum illuminance indicator of the surveillance camera?
IRE Level: The maximum amplitude of the video output of the CCD camera is generally set at 100IRE (or 700 mV), and a 100IRE video indicates that you can fully drive a monitor to show the best brightness and contrast image quality. 50IRE video shows only half the contrast, 30IRE (or 210 millivolts) that only 30% of the original amplitude, usually 30IRE is the lowest performance available image value. So there is no indication of the lowest illuminance results of the IRE grade and are not actually comparable. Finally, it is the camera's special function settings.
Therefore, the use of different F value of the lens, the camera's minimum illumination value of the determination will have a decisive impact. Second, the light source color temperature. The color temperature is an indicator of the light wavelength content in the light source. A 3200K light source is mostly between 600 nm and 900 nm, and a 9300K light source is between 300 and 500 nm, so the different color temperatures will change completely Test Results. On a typical CCD sensor, a light source with a wavelength of 600 nanometers will produce 10 times more electrons than a wavelength of 900 nanometers. This is why the color temperature is particularly marked for the meaning of the minimum illumination measurement results.
This is an important parameter of the analog camera, but this parameter can be said to be the most mysterious camera indicators (no one). The camera's minimum illumination is also known as the camera's sensitivity. There are many factors that affect the minimum illumination value of the camera, including the parameters of the camera's lens (ie, F value), the color temperature parameters of the light source, the video level amplitude IRE level, and several function parameters of the camera. First, is the amount of light parameters. An aperture for the F1.4 lens through the amount of light level is F1.2 lens twice, while the F1.0 lens is F10 lens light through the amount of 100 times.
