[Table of Contents]

Plasma and Fusion Research

Volume 2, S1117 (2007)

Regular Articles

Nonstop Lose-Less Data Acquisition and Storing Method for Plasma Motion Images
Hideya NAKANISHI, Masaki OHSUNA, Mamoru KOJIMA, Setsuo IMAZU1), Miki NONOMURA, Haruhiko OKUMURA2), Yoshio NAGAYAMA and Kazuo KAWAHATA
National Institute for Fusion Science, Toki 509-5292, Japan
1)
Pretech Corp., 1-19-13 Kanayama-cho, Atsuta-ku, Nagoya 456-0002, Japan
2)
Mie Univ., 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, Japan
(Received 12 December 2006 / Accepted 20 February 2007 / Published 20 November 2007)

Abstract

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.

Keywords

plasma diagnostics, loss-less compression, MPEG, real-time, streaming, JPEG-LS, zip, LABCOM/X

DOI: 10.1585/pfr.2.S1117

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References

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This paper may be cited as follows:

Hideya NAKANISHI, Masaki OHSUNA, Mamoru KOJIMA, Setsuo IMAZU, Miki NONOMURA, Haruhiko OKUMURA, Yoshio NAGAYAMA and Kazuo KAWAHATA, Plasma Fusion Res. 2, S1117 (2007).