No abstract

Now, in the field of medical and ergonomics, using a device using a LED and a plurality of two-dimensional PSD camera, we have analyzed the behavior of a person. It is necessary to detect the position of each of the LED, this device, you must synchronize the two-dimensional PSD camera and LED. In this study, we propose a method for detecting the position of the plurality of light sources at the same time without synchronization. After the LED modulated to a plurality of different frequencies and received by the PSD, extracted by the frequency filter. Thus, it is not necessary to synchronize the PSD and the LED, it is possible to detect the position light sources at the same time a plurality for communication without wired or wireless I enabled.

Remote sensing of position detection and motion detection plays an important part in the welfare filed of human social life. Privacy is a serious problem when detecting human position and motion. A position sensitive device (PSD) only detects the position of a light target without detailed image of human. For detecting multiple light targets, there are various problems such as synchronized light source and noise in daily life space. In this study, we suggest a method using modulated light targets to separate different light targets and eliminate the noise in daily life space for motion detection of a PSD. The target light intensity is modulated with different high frequency source for different targets, so that the noise in daily life space can be eliminated and the positions of different targets can be separated by using band-pass filters. Experimental results showed this method is effective.