Image preprocessing techniques in video surveillance

 Image preprocessing techniques in video surveillance

 

Business,Electronics,Science & Technology Improve monitoring of image quality and coded transmission efficiency monitoring system involving multiple links, upstream from the actual scene, to the middle of the transmission network, to the user terminal downstream, including image acquisition, compression, transmission or storage, decompression and display section, any one of the upstream part of the problem, the impact on the image quality is not able to correct or remedy the downstream part of. Part of the video signal preprocessing at the most upstream monitoring systems, for the purposes of the main processing, video surveillance, the main processing generally refers to video compression coding and transmission, previously known as the pretreatment process in general, often it will merge the video capture part. Undoubtedly, video capture preprocessing is an important part of the pretreatment effect will directly affect the quality and efficiency of the subsequent image acquisition coded transmission process. There is a phenomenon can be effectively described in terms of the role of pre-processing of image quality improvement is: for the same scene, the same bit rate, the larger the difference between the quality of ip camera of different manufacturers often a decoded output video. Especially in the

 relatively harsh environment, the difference is more significant. One important reason for this difference is that: in the monitoring system, although we are using standardized video compression method, but the quality of the final output image decoding depends largely on whether the level of pretreatment, pretreatment is good or bad, sometimes including appropriate follow-up treatment. As people's awareness of the importance of pre-treatment continues to improve, with integrated signal processor chip and the ability to continue to enhance the industry's increasing emphasis on pre-processing of the video signal, high-quality surveillance products on the market must not be separated high-quality video preprocessing methods. The first function is to improve the quality of video pre-encoded video. In the actual video surveillance applications, unlike entertainment video quality can be guaranteed because there are high-quality collection of video cameras, sound studio shooting environment and professional and technical personnel at any human intervention. The video surveillance system due to the impact of cost and environmental factors, acquired the original video quality is not high, even very low. For example, due to the impact on the environment, noise, light,

 motion, etc., often collected images often appear blurred, distorted, noise, too bright or too dark, color and other effects is not clear. For such a relatively poor video compression and then, transmitted, decoded for display, the user sees the video monitor is often not satisfactory. How to improve the collection of video quality problems in the existing conditions placed on it in front of us. In response, a response that is important part of the video capture preprocessing (preprocessing), to facilitate the capture of video to improve the quality of video in favor of the subsequent processing in order to facilitate the user to extract information of interest in the video. The second function is to improve the pre-processing of video coding efficiency, and to the rate control.