抄録
This paper describes the blood beat measurement system with near infra-red ray. A blood vessel was captured sequentially with a CCD camera, an near infra-red LED and an optical filter. In order to extract a blood vessel portion from each captured image, binarization processing was performed using the threshold on the basis of the first captured image. For the reduction of the error caused by the subject's hand slight movement, the position adjustment was performed with the landmark, which was found with skeltonizing and extracting the diverging point. The pixel number of the blood vessel portion was counted and the thickness of the blood vessel was analyzed by performing a Fourier analysis. The Fourier analysis shows the peak at the frequency of 1.4 Hz corresponding to 84 beat count in a minute. For the evaluation of the proposed method, blood beat was measured with a sphygmomanometer simultaneously. As the results, the almost same pulse rate could be obtained from both method. These results indicate that the method has the possibility to count a pulse.
