Research And Development Of Hdv Acquisition Front-end For Low Illumination Environment

In recent years, many mines has equipped the mine surveillance and monitor system, which not only can monitor and record the Work situation of mine intuitively, but also can discover the hidden trouble promptly in group to prevent the accidents before they occur can provide the related resources for the afterwards accident analysis at the same time. But the present many cameras only can work under the normal environment, under the low light intensity environment, the picture to be rough. This has caused enormous inconvenient for the emergency rescue in the event of an accident. It is possible to develop one kind of high-definition video capture device for low light intensity environment in order to resolve the needs of high-definition picture under low visibility and can be widely applied to other weak/dim light environments such as night-time battlefield, night surveillance, tunnels, etc.For the problems that imaging result is not satisfactory under the low light intensity environment in the existing solutions and products, we propose two kinds of video acquisition solution under low light intensity environment: according to the character of CMOS sensor: high input impedance, low static power, flexible readout method, strong drive and anti-jamming capability and ease to integrate, combined with the low light night vision technology, presents a low light level video Acquisition solution that for Low Illumination Environment coupled the image intensifier with the CMOS image sensor module, which can be used in many fields that required the products to be portable, simple, low-power, such as the coal mine, tunnel monitoring, rescue and other situations; in pursuance of the advantages of CCD sensor that high SNR, wide dynamic range, high charge transfer efficiency and output image quality, unified the auxiliary lighting, put forward a high-resolution CCD camera program. It is great significant to use in the video surveillances that are not sensitive to power consumption and require lower cost. In addition,Given a detailed analysis of the solutions and the concrete circuitry design and software realization.Finally, we take the multimedia data processing terminal based-on ARM11 as an experiment platform to achieve the H.264 image coding by writing a simple application. The test results show that this system can implement the high-definition video images collection, compression and storage within the scope of illumination 10-4 ~ 102Lux.