基于FPGA的广告监播系统的研究与实现

发布时间：2018-05-03 17:50

本文选题：广告监播 + 音频监测　；参考：《电子科技大学》2012年硕士论文

【摘要】：广告监播主要用于收集同行业的广告投递情况，进一步明确自身的广告内容与投放方式，分析媒体在产品推广中的作用；为媒体提供履行广告合同的依据。本文提出的基于FPGA实现的广告监播系统分为音频监测部分与台标识别部分，这两个部分并行执行识别动作。其核心模块是特征提取与模板匹配。音频监测部分中，设计了对起始位置不太敏感同时数据量小的滑窗累加算法完成音频特征提取。同时设计了一键建库的功能，可以随时添加或更新比对库中的音频特征信息。每个系统可并行监播6路音频广告，节省开支。音频滤波部分引入了模型设计的思想，使用filterbuilder完成滤波器的自动代码生成。台标识别部分综合使用动态对消法与具有滑窗模板的阈值分割算法进行特征提取。不会随着台标的位置移动而影响台标的识别率，体现了良好的抗抖动性与鲁棒性。台标的识别库支持升级，以防止电视台台标的更换而影响识别的效果。模板匹配采用搜索比对的方式，兼顾了空间判据与时间判据，具有一定的抗干扰性，有效降低了漏报率与虚报率。最后对系统完成了模块的仿真验证与级联调试，经实验证明该系统具有稳定可靠的特性。基于FPGA的广告监播系统具有智能检测广告，支持实时建库，同时识别出广告所在的电视台等特点，，为广告的监播提供充分的依据。
[Abstract]:Advertising supervision and broadcasting is mainly used to collect the information of advertising delivery in the same industry, to further clarify its own advertising content and mode of delivery, to analyze the role of media in product promotion, and to provide the media with the basis for fulfilling the advertising contract. The advertising monitoring system based on FPGA is divided into audio monitoring part and station mark recognition part. These two parts perform recognition in parallel. Its core module is feature extraction and template matching. In the audio monitoring part, a sliding window accumulation algorithm, which is not sensitive to the starting position and has a small amount of data, is designed to extract audio features. At the same time, the function of one-key library is designed, which can add or update the audio feature information in the comparison library at any time. Each system can broadcast 6 audio advertisements in parallel, saving money. In the part of audio filter, the idea of model design is introduced, and filterbuilder is used to complete the automatic code generation of the filter. The recognition part uses dynamic feature extraction method and threshold segmentation algorithm with sliding window template. It does not affect the recognition rate of the station mark by moving with the position of the station mark, which reflects the good anti-jitter and robustness. The identification library of station mark supports upgrading to prevent the change of station mark and influence the effect of identification. Template matching is based on searching and comparing, which takes spatial criterion and time criterion into account. It has some anti-interference, and effectively reduces the rate of missing report and false report. Finally, the simulation and cascade debugging of the system are completed, and the system is proved to be stable and reliable. The advertising monitoring and broadcasting system based on FPGA has the characteristics of intelligent detection, real-time database building and recognition of the television station where the advertisement is located, which provides sufficient basis for the monitoring and broadcasting of advertisements.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TN948.1;TN791

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