| Presentation | 2022-02-25 Acceleration of local histogram generation for change detections in satellite SAR images using CPU-integrated graphics processor Masato Gocho, Kazunori Ueda, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper presents OpenCL-based parallel implementations with CPU-integrated graphics processors for change detection algorithms in multi-temporal SAR images. In this algorithm, a histogram-based statistical value is generated from each subimage, which is centered around each pixel on SAR images, to judge whether the pixel is changed or not. To reduce the computation time, the generated histogram can be reused and updated using non-overlapped pixels between subimages that have same ranges of the pixel values. In the proposed algorithm, SAR images are subdivided with many subgroups of 16 work-items, and the 16 items cooperatively compute the 16 statistical values one by one by updating the histograms until the range of pixel values is changed. We found that the CPU-integrated GPU on the Core i7 processor takes 56 seconds, which is 7.6 times faster than the 4-threaded CPU, for two ALOS-2 images with 37305x26811 pixels. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | SAR image / change detection / histogram / integrated graphics processor |
| Paper # | SANE2021-101 |
| Date of Issue | 2022-02-17 (SANE) |
| Conference Information | |
| Committee | SAT / SANE |
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| Conference Date | 2022/2/24(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Satellite technology, etc. |
| Chair | Hiroyasu Ishikawa(Nihon Univ.) / Toshifumi Moriyama(Nagasaki Univ.) |
| Vice Chair | Tetsushi Ikegami(Meiji Univ.) / Takana Kaho(Shonan Inst. of Tech.) / Makoto Tanaka(Tokai Univ.) / Takeshi Amishima(Mitsubishi Electric) |
| Secretary | Tetsushi Ikegami(KDDI Research) / Takana Kaho(NICT) / Makoto Tanaka(Univ. of Tokyo) / Takeshi Amishima(ENRI) |
| Assistant | Daisuke Goto(NTT) / Yuuki Koizumi(NHK) / Takayuki Kitamura(Mitsubishi Electric) |
| Paper Information | |
| Registration To | Technical Committee on Satellite Telecommunications / Technical Committee on Space, Aeronautical and Navigational Electronics |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Acceleration of local histogram generation for change detections in satellite SAR images using CPU-integrated graphics processor |
| Sub Title (in English) | |
| Keyword(1) | SAR image |
| Keyword(2) | change detection |
| Keyword(3) | histogram |
| Keyword(4) | integrated graphics processor |
| 1st Author's Name | Masato Gocho |
| 1st Author's Affiliation | Mitsubishi Electric Corporation(Mitsubishi Electric) |
| 2nd Author's Name | Kazunori Ueda |
| 2nd Author's Affiliation | Waseda University(Waseda Univ.) |
| Date | 2022-02-25 |
| Paper # | SANE2021-101 |
| Volume (vol) | vol.121 |
| Number (no) | SANE-378 |
| Page | pp.pp.21-25(SANE), |
| #Pages | 5 |
| Date of Issue | 2022-02-17 (SANE) |