The vehicle speed is calculated from the rotation of the wheels, so errors occur due to tire wear and other factors. Methods using GPS and map information also have the problem of being easily affected by the environment and changes over time. Therefore, we focused on the patterns on the road patterns and developed a position estimation method by matching feature points on road surface images, and applied it to measuring the vehicle speed.
The speed estimation procedure is as follows : ① Deriving pairs of feature points on images with the same features. ② Findng geometry parameters by feature points, . ④ Calculating distance by majority pairs. An example of
speed calculation is shown in the
right figure. The relative error
with GPS is -5%.

We are conducting research to return the relationship between both animals and humans to a more natural state by using low and high frequencies to deter roadkill and railkill as well as beast damage control. The low-frequency “InoDon kumaDon” uses sensors to drive away wild boars, bears, etc. trapped there, and the high-frequency “Hyper Deer Sonic” uses a timer to run for a certain time and is used on deer, birds, etc., with great results. There is no effect on other animals or humans. The high-frequency type is available in vehicle-mounted and installed types, while the low-frequency type is only available in the installed type due to the large diameter of the speaker. However, a portable type, Hyper Deer Sonic, is currently under development and is highly anticipated by people in the forestry and mountaineering industries.