Extract the postural rolling of patient's body from video image
K. Ohta, E. Yasui, T. Kawaguchi, M. Azuma, Chikara Ohta · 2003
This study has established the method of recognition of the postural rolling of a patient's body through the use of a video-mail system, in order to evaluate the priority of the video mail in the tele-nursing system. The patient's appearance is recorded by a video camera in front of the patient. Next, consecutive video pictures are resolved into still and individual frame images. The face area and background are extracted by calculating the difference of the consecutive frames. To extract the postural rolling of the body, the sequential change in the position of the face is measured. The change in the vertical direction is almost negligible. We focus on the change in the horizontal direction. In addition, the behavior of the sequential change in the horizontal direction is transformed into a chaotic behavior and the Fourier power spectrum. This paper proposes that there are differences between healthy and unhealthy posture by examining the chaotic behavior and Fourier power spectrum, and they are useful to evaluate the priority of the video mail in the tele-nursing system.