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2, the gamma coefficient is the contrast index, the general camera has only 0.45 grades, and the high-end camera has 0.8~1 adjustable, which is used to improve the image layering and greatly improve the vision when the subject is flat. The clarity on the top.
3, automatic white balance: automatically adjust the ambient light source, maintain color reproduction, no color cast, is the camera's grade level is extremely important evaluation criteria.
4, camera input voltage: In principle, the color camera must use AC input power, AC220V or AC24V, but can not use DC power, because the stability of the color signal depends on the AC synchronization signal is correct, otherwise it will easily cause color drift. At present, the domestic use of DC input, generally take the method of reducing the color density to make the color drift is not obvious, which is not allowed according to international standards, the use of automatic aperture lens is a way to make up for the color drift problem.
5. The trend of camera development in the future, the camera has become more and more wide with the application occasions, such as image stabilization system; image automatic biometric system; automatic counting; automatic alarm system, etc. Function, due to the increasing integration of DSP, the circuit of the camera is more and more simple, leaving enough space for intelligent software development. In the future, the camera will integrate multiple automatic functions and images to be compressed, stored and transmitted as An integrated intelligent front-end device.
Based on the above 5 points, Xiaobian summarizes how to properly select the appropriate camera in the security project. The first condition is to fully understand the role of the camera's performance indicators, and then according to the specific conditions of the project: natural environment Conditions, (mainly refers to lighting conditions, whether there is backlighting, whether there is strong light, whether it is used at night), how is the illumination of the auxiliary light source? What is the size of the subject? (Generally, the range of objects is small, but the resolution is high), the user's affordability, and so on. In order to make a more correct choice for customer requirements, we can design an economical and reasonable security engineering program.
Five indicators that the camera is not paying attention to
[ Huaqiang Security Network News ] Today, Xiaobian takes everyone to know the "corner" indicator of the camera. In fact, in addition to the super-wide dynamics, strong light suppression, and strong light reversal, the camera also has some indicators that are not noticeable. 1, signal-to-noise ratio, an important indicator to identify whether the camera screen is clean, the general (AGCOFF) situation should be controlled between 48 ~ 52db, less than 48db image noise increased, the general low-end camera this indicator is basically not up.