2020 Volume 76 Issue 2 Pages I_672-I_677
We examined the accuracy of the 3D image analysis for floating model experiments, the effect of imaging conditions on measurement accuracy, and labor saving for long-term measurements. The 3D image analysis was able to measure with high accuracy for the floating model experiment. To get high quality data, two cameras should be installed line-symmetrically with the object so that the ratio of the height to the horizontal distance from the object is 0.4 to 0.7, and the distance to the object in the long case, it was effective to secure the resolution with an optical zoom lens. Data containing white noise could be improved by low-pass filtering. Labor saving was achieved by using a commercial video camera instead of a high-speed camera. This method maintained the measurement accuracy and realized a significant labor saving of data analysis capacity. In the future, this method is expected to be applicable to irregular wave experiments that require long-term measurement.
