1. The photoelectric sensor is used to measure blood pressure, the sampling frequency is 20~50, the video recording of the cell phone camera can be up to 30FPS, through the image analysis can be done at a sampling frequency of 30 Hertz;
2. The physical examination of the treasure blood pressure measurement of some of the crowd has a error is somewhat large, and the data provided by its can only be used as a reference, because the cell phone can not be a substitute for the medical equipment.