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目的:建立视频信号中数字显示的温度值的识别方法,为电磁辐射热效应研究提供定量依据。方法:采用MATLAB视频图像分析工具实现交互式的视频信号中数字区域的定位与分割、形态学操作预处理以及七段码规则数字识别分析,获得温度数据并绘制实验期间动物体表温度变化曲线。结果:使用交互式数字区域定位分割、形态学操作预处理以及七段码规则可有效识别视频中的温度显示数字,多次抽样检测的正确识别率为100%。识别过程中出现被高帧率的视频记录到的发光二极管动态显示变化过程发光滞留所形成的奇异点,可通过采用邻域中值替换法予以解决。结论:利用MATLAB识别此类视频信号中的数字具有方法简单、可靠,实用性强的优点,为促进电磁辐射热效应的研究提供了参考方案。
Objective: To establish a method to identify the temperature of digital display in video signal, and to provide a quantitative basis for the study of thermal effects of electromagnetic radiation. Methods: Using MATLAB video image analysis tools to locate and segment the digital region in the interactive video signal, morphological preprocessing and seven-segment code regular digital recognition and analysis, get the temperature data and draw the curve of animal body surface temperature during the experiment. Results: The use of interactive digital region-based segmentation, morphological preprocessing, and the seven-segment code effectively identify the temperature display in the video. The correct recognition rate for multiple sampling was 100%. During the identification process, the singular points formed by the light-emitting diodes recorded by the video with the high frame rate recorded during the dynamic display of the change of process glow can be solved by adopting the neighborhood median replacement method. Conclusion: The use of MATLAB to identify digital signals in this kind of video signal has the advantages of simple, reliable and practical. It provides a reference scheme to promote the thermal effect of electromagnetic radiation.