For the purpose of providing access for blind people to graphical information, a device called "tactile mouse" has been developed. It consists of an ordinary computer mouse with a small tactile display unit on its top. The combinatory effect of the active movement of the hand and the tactile feedback to the fingers makes users feel as if they were exploring tangible drawings. To evaluate its usability, two experiments of line following and form recognition were conducted. It was found that, when the parameter called hand-movement-to-pin ratio was very low, the chance of deviation from the virtual forms increased, and when it was too high, on the other hand, recognition task became difficult and the error rate rose. These factors led to longer performance time and lower ratings. These results gave a quantitative indicator of tha ratio for the efficient use of the tactile mouse.
Pointing devices play important roles in recent computer systems under GUI environments, but work-loads are concentrated to hands and arms in addition to vision. In order to reduce the physical loads, foot-operated pointing device has been studied, and we developed a device operated by both feet inclining a foot-plate. In this study, we investigated the performances of pointing in terms of display resolution and of drawing lines. Significant dependency on display resolution has not been observed, and it was found that the performance of line drawing is lower than that of a conventional mouse.
The purpose of this study is to examine the discrimination sensitivity of binoular disparity with various directing stimuli arranged in surroundings of the fixation point. The stimuli were located at eight directions. The distances from the fixation point to the object were 2, 4, 6, 8deg. When the stimuli were presented at the right and the left directions, individual differences of the discrimination sensitivity were found among subjects. However, the discrimination sensitivities were shifted to the uncrossed disparity in above of the fixation point and shifted to the crossed disparity below of the fixation point. This tendency was same in each subject. These results, such as the asymmetry of discrimination sensitivity in above or below of the fixation point, might be related to the vertical horopter.
This review paper gives a comprehensive survey of the state of the art of computer-aided diagnosis(CAD) of medical images, especially which is centered on the breast images including mammograms and ultrasonograms. CAD is defined as a diagnosis mode by a physician who takes into account the results of the computer output as a "second opinion", which are derived from quantitative analysis of medical images. The purpose of the CAD is to improve the diagnostic accuracy and also the consistency of physicians' interpretation by using computer output as a guide.
We measured the Fractal the dimension of blood vessels in fundus angiography of human eye with box counting method applying fractal theory. We tried to give quantitative expression in complexity of vessel structure, i.e., the change of vessel tract, on the extend of vessel, in human eyes applying the Fractal theory.
The system that it was instructed in the rehabilitation of the at-home patient from the distance was manufactured as an experiment. Connect a patient house with the hospital with the ISDN circuit and the CATV circuit, and rehabilitation training guidance is tried by using the moving picture. Research is advanced with the aim of the realization, and report the outline of the system and middle evaluation this time.