A video surveillance system development platform corresponding to the basic functions should be composed of the following basic modules: video capture module, video compression module, network transmission module, video decompression module, video playback module. With these basic modules, you can build a video surveillance system with the most basic functions. The key technologies in each module are described below.
Double buffering technology is adopted in the video capture module. Two areas are opened in the memory to save the captured video, and the capture card repeatedly saves the current image data to the two memory areas, and the calling module repeatedly obtains the current image data from the two areas, but two The operation is for different areas. When the image in one area is being read, the image in the other area is already updated, and can be called directly next time, that is, the image data of the memory area is currently read, but The next time is to read the data in the memory area, and when reading the data in the memory area, the image data of the memory area has been updated by the collection device, which speeds up the image acquisition module. In the video compression decompression module, a software compression decompression solution is adopted. Although hardware compression and decompression has the characteristics of high speed, because it needs to be attached to a specific device, using a fixed algorithm, it is impossible to adjust and update the algorithm according to actual needs, and it is difficult to expand functions such as image recognition and video encryption. The software compression decompression scheme is adopted. When the algorithm needs to be updated, it is only necessary to replace the code decoding library, and it can also get rid of the dependence on foreign hardware chips.
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