| Presentation | 1995/5/26 Estimation of Sagittal Movements of the Temporomandibular Joint from Digitized Sequential Image of X-ray Television Minoru Kenmochi, Toyohiko Hayashi, Kazumasa Katoh, Michio Miyakawa, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper describes an estimation of sagittal movement of the temporomandibular joint (TMJ) employing X-ray television data. This estimation consists of two distinct procedures : 1)computation of the velocity field (optical flow) employing a gradient method ; 2)least-squares estimation of the velocity and the angular velocity (movement parameters) from the optical flow obtained. Since the condylar image observed as its contour is somewhat blurred and partially occluded, the computed optical flow is usually erroneous, which deteriorates the accuracy of the movement parameters to an unacceptable level. To improve this, we recurrently estimated the parameters through an iterative procedure as follows : 1) to estimate the optical flow from the parameters obtained ; 2) to estimate the parameters again by loading every flow vector with weight proportional to the directional difference relative to corresponding flow vector obtained in the previous step, 3) to repeat steps 1) and 2) until the parameters converge. This iterative improvement of the movement parameters was verified to be effective, through experiments employing an actual X-ray-TV image sequence of the TMJ. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | temporomandibular joint / X-ray television / optical flow / gradient-based method / least-squares |
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| Committee | MBE |
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| Conference Date | 1995/5/26(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | ME and Bio Cybernetics (MBE) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Estimation of Sagittal Movements of the Temporomandibular Joint from Digitized Sequential Image of X-ray Television |
| Sub Title (in English) | |
| Keyword(1) | temporomandibular joint |
| Keyword(2) | X-ray television |
| Keyword(3) | optical flow |
| Keyword(4) | gradient-based method |
| Keyword(5) | least-squares |
| 1st Author's Name | Minoru Kenmochi |
| 1st Author's Affiliation | Graduate School of Science and Technology, Niigata University() |
| 2nd Author's Name | Toyohiko Hayashi |
| 2nd Author's Affiliation | Graduate School of Science and Technology, Niigata University |
| 3rd Author's Name | Kazumasa Katoh |
| 3rd Author's Affiliation | First Department of Prosthetic Dentistry, School of Dentistry, Niigata University |
| 4th Author's Name | Michio Miyakawa |
| 4th Author's Affiliation | Department of Information Engineering, Faculty of Engineering, Niigata University |
| Date | 1995/5/26 |
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| Volume (vol) | vol.95 |
| Number (no) | 84 |
| Page | pp.pp.- |
| #Pages | 8 |
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