NDLI: Evaluation of brightness resolution of WEFAX images transmitted through GMS

Content Provider	IEEE Xplore Digital Library
Author	Yasuda, A. Yamashita, K. Ruan, Z. Lu, Y.
Copyright Year	1993
Description	Author affiliation: Lab. of Commun. Eng., Tokyo Univ. of Mercantile Marine, Japan (Yasuda, A.; Yamashita, K.; Ruan, Z.; Lu, Y.)
Abstract	The Japanese meteorological satellite GMS-4 takes visible or infrared images of the Earth's surface and transmits to a vast area (including the oceans) the cloud images (called WEFAX: weather facsimile). A ship steaming over the oceans can avail itself of the transmitted images for its navigation. In designing the onboard reception system. It is necessary to analyze the relation between the quality of the image and that of the reception systems. The authors evaluate the quality of the images by observing the amplitude variation of the pixels that constitute the gray scale. It is proved that the 64-leveled gradation can be ensured when the C/N is larger than 10 dB. Then, the system transmits the original images properly so far as the quality of the gray scale is concerned. Next, the authors evaluate the brightness resolution of the infrared cloud image. The distribution of the number of pixels of each amplitude of the signal ranging from 80 to 900 (arbitrary units) should have 64 discrete peaks, if the image is transmitted properly with the 64-leveled gradation. The distribution has discrete peaks in the low brightness region corresponding to the sea surface where the temperature varies gently along the scanning line. On the other hand, it is rather continuous in the higher brightness region corresponding to the summits of clouds where the temperature varies roughly. The frequency of the video signal may exceed the transmitter's specification there.
Starting Page	1969
Ending Page	1971
File Size	283117
Page Count	3
File Format	PDF
ISBN	0780312406
DOI	10.1109/IGARSS.1993.322052
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-08-18
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Brightness Image resolution Ocean temperature Clouds Infrared imaging Sea surface Pixel Meteorology Satellites Earth
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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