1-2hit |
Kazutoshi KOGA Hidetoshi MIIKE Masahiro MOMOTA
An exact method determining optical flow from a sequence of images is presented. We adopt a pixel-based analysis calculating mutual-correlation functions between temporal change of brightness at a targer pixel and that at neighboring ones. Local velocity at the target pixel is deceided analytically from lag times of the correlation functions.
Hidetoshi MIIKE Yasushi KURIHARA Hajime HASHIMOTO Kazutoshi KOGA
A new dynamic image processing technique is proposed for measuring the velocity-field of the translational motion of crowded particles. The local velocity at a target pixel-site is estimated by mutual-correlation analysis between the temporal brightness change of the target pixel and that of neighbouring pixels. The next-nearest 16 pixels are selected as the neighbouring pixels in this study. The direction and the speed of the particle motion are evaluated by the mutual-correlation function having maximum value and the lag time of the function, respectively. The usefulness of the proposed technique is examined by a simulation experiment (unidirectional motion) and an actual scene analysis (vortex motion). Obtained velocity-field of these motions are visualized with orientated lines, and the resulting fields are consistent with expected fields.