Nonstop Lose-Less Data Acquisition and Storing Method for Plasma Motion Images
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- NAKANISHI Hideya
- National Institute for Fusion Science, Toki 509-5292, Japan
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- OHSUNA Masaki
- National Institute for Fusion Science, Toki 509-5292, Japan
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- KOJIMA Mamoru
- National Institute for Fusion Science, Toki 509-5292, Japan
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- IMAZU Setsuo
- Pretech Corp., 1-19-13 Kanayama-cho, Atsuta-ku, Nagoya 456-0002, Japan
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- NONOMURA Miki
- National Institute for Fusion Science, Toki 509-5292, Japan
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- OKUMURA Haruhiko
- Mie Univ., 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, Japan
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- NAGAYAMA Yoshio
- National Institute for Fusion Science, Toki 509-5292, Japan
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- KAWAHATA Kazuo
- National Institute for Fusion Science, Toki 509-5292, Japan
抄録
Plasma diagnostic data analysis often requires the original raw data as they are, in other words, at the same frame rate and resolution of the CCD camera sensor. As a non-interlace VGA camera typically generates over 70 MB/s video stream, usual frame grabber cards apply the lossy compression encoder, such as mpeg-1/-2 or mpeg-4, to drastically lessen the bit rate. In this study, a new approach, which makes it possible to acquire and store such the wideband video stream without any quality reduction, has been successfully achieved. Simultaneously, the real-time video streaming is even possible at the original frame rate. For minimising the exclusive access time in every data storing, it has adopted the directory structure to hold every frame files separately, instead of one long consecutive file. The popular ‘zip’ archive method improves the portability of data files, however, the JPEG-LS image compression is applied inside by replacing its intrinsic deflate/inflate algorithm that has less performances for image data.
収録刊行物
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- Plasma and Fusion Research
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Plasma and Fusion Research 2 S1117-S1117, 2007
一般社団法人 プラズマ・核融合学会