中文说明：该程序是一个通过手机摄像头获取人的手指中血液量变化的视频图像，然后通过数据处理程序将视频文件分帧变为图像文件，将所有图像文件中像素的变化转换为波形信号，在时域中对数据进行加窗，频域中提取最大峰值对应的频率，然后转换为心跳频率。
English Description：
The program is a mobile phone camera to obtain the video image of blood volume changes in the fingers, and then through the data processing program to frame the video file into an image file, the changes of pixels in all image files are converted into waveform signals, the data is windowed in the time domain, the frequency corresponding to the maximum peak value is extracted in the frequency domain, and then converted into the heart rate.