| Presentation | 1997/9/12 Extraction of fluorescent dot traces from scanning laser ophthalmoscope image sequence by spatio-temporal image analysis : Gabor filter and Hough transform filtering Shuzo Yamamoto, Shinichi Tamura, Yoshinobu Sato, Seiyo Harino, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | The scanning laser ophthalmoscope allows tracking of fluorescent dot motion and as a result direct measurement of flow velocities in perimacular capillaries. It may give an important index of retinal local soundness or reflect whole body circulation status such as in diabetes. However, the fluorescent dots are so faint and unstable that it is hard to detect by conventional digital still image processing methods. For this purpose, we generated a spatio-temporal image of fluorescent dots on a capillary. Then, first we applied Gabor filters tuned to direction of traces for detecting them, and next by discriminating and integrating the output using two levels of threshold, we could extract traces of fluorescent dots. However the medium size Gabor filter takes a lot of time for convolution calculation. Then, we propose Hough transform filtering including Hough transform Gabor filtering as a very long Gabor filter able to detect a whole trace by a single step. By this we can shorten the processing time, and we could detect 60% of traces without misdetection, which will be enough to measure the mean flow velocity in the capillary. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Eye fundus image / Scanning laser ophthalmoscope / Spatio-temporal image / Microcirculation measurement / Gabor filter / Hough transform |
| Paper # | PRMU97-108 |
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| Committee | PRMU |
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| Conference Date | 1997/9/12(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Pattern Recognition and Media Understanding (PRMU) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Extraction of fluorescent dot traces from scanning laser ophthalmoscope image sequence by spatio-temporal image analysis : Gabor filter and Hough transform filtering |
| Sub Title (in English) | |
| Keyword(1) | Eye fundus image |
| Keyword(2) | Scanning laser ophthalmoscope |
| Keyword(3) | Spatio-temporal image |
| Keyword(4) | Microcirculation measurement |
| Keyword(5) | Gabor filter |
| Keyword(6) | Hough transform |
| 1st Author's Name | Shuzo Yamamoto |
| 1st Author's Affiliation | Div. of Functional Diagnostic Imaging, Osaka University Medical School() |
| 2nd Author's Name | Shinichi Tamura |
| 2nd Author's Affiliation | Div. of Functional Diagnostic Imaging, Osaka University Medical School |
| 3rd Author's Name | Yoshinobu Sato |
| 3rd Author's Affiliation | Div. of Functional Diagnostic Imaging, Osaka University Medical School |
| 4th Author's Name | Seiyo Harino |
| 4th Author's Affiliation | Dept. of Ophthalmology, Yodogawa Christian Hospital |
| Date | 1997/9/12 |
| Paper # | PRMU97-108 |
| Volume (vol) | vol.97 |
| Number (no) | 251 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |