Transactions of the Institute of Systems, Control and Information Engineers
Online ISSN : 2185-811X
Print ISSN : 1342-5668
A Semi-Automatically Converting System of Graph Type Data to Numerical Value
Tadaharu YOKOKAWAYutaka KURIHARAEtsuo NAKADAAkiyoshi YOSHIKAWA
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1988 Volume 1 Issue 3 Pages 92-99

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Abstract

A system for quick conversion of data points and experimental curves which are drawn on a data graph to numerical values has been developed by applying a graphically processing technique.
The present system has the functions capable to discriminate different data marks and to determine the coordinates of data points and experimental curves. The coordinates are automatically determined for a data point that does not overlap with the others and for any experimental curve with no sharp cusp and break longer than 16mm. Different kinds of marks can be discriminated by looking into their characteristic features such as the ratio of surrounding length to area, the positional relation between extreme points, and the behavior of reflaction points.
It turns out that the processing time can be shortened by the following, i. e, dropping out the regions with no black pixel by a rough scanning before the detailed processing, and indication of the rough position of data points and regions to be processed by use of a mouse unit. The latter was very effective to avoid some disturbances caused by written comments and ruled lines drawn in the graph.
The system also provides a function of fitting a series of given data points to suitable mathematical function.

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