Journal cover Journal topic
Geoscientific Instrumentation, Methods and Data Systems An interactive open-access journal of the European Geosciences Union
Geosci. Instrum. Method. Data Syst., 5, 305-314, 2016
http://www.geosci-instrum-method-data-syst.net/5/305/2016/
doi:10.5194/gi-5-305-2016
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
21 Jul 2016
Automatic segmentation and classification of seven-segment display digits on auroral images
Tuomas Savolainen1, Daniel Keith Whiter2,3, and Noora Partamies2,4 1Aalto University, Helsinki, Finland
2Finnish Meteorological Institute, Helsinki, Finland
3University of Southampton, Southampton, UK
4University Centre in Svalbard, Svalbard, Norway
Abstract. In this paper we describe a new and fully automatic method for segmenting and classifying digits in seven-segment displays. The method is applied to a dataset consisting of about 7 million auroral all-sky images taken during the time period of 1973–1997 at camera stations centred around Sodankylä observatory in northern Finland. In each image there is a clock display for the date and time together with the reflection of the whole night sky through a spherical mirror. The digitised film images of the night sky contain valuable scientific information but are impractical to use without an automatic method for extracting the date–time from the display. We describe the implementation and the results of such a method in detail in this paper.

Citation: Savolainen, T., Whiter, D. K., and Partamies, N.: Automatic segmentation and classification of seven-segment display digits on auroral images, Geosci. Instrum. Method. Data Syst., 5, 305-314, doi:10.5194/gi-5-305-2016, 2016.
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In this paper we describe a new method for recognition of digits in seven-segment displays. The method is used for adding date and time information to a dataset consisting of about 7 million auroral all-sky images taken during the time period of 1973–1997 at camera stations centred around Sodankylä observatory in Northern Finland. In each image there is a clock display for the date and time together with the reflection of the whole night sky through a spherical mirror.
In this paper we describe a new method for recognition of digits in seven-segment displays. The...
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