Method of abstracting data from curve function recorded on cooraination peper

Abstract

This invention relates to a method for picking up data from curve functions recorded on the coordinate paper used in a roller automatic recording instrument in an image process technology including: first of all carrying out scanning process to coordinate paper recording curves to get the chart data of the curves then eliminating the profile of the background chart by the binary process based on the background of the chart data and profile of the target image, then carrying out median smooth process to the curve, then taking the hemline start position of the chart data as the primary standard and the sample length unit determined in advance as the step to fetch the vertical coordinate value Y on the curve section by section and store the length position X and the function value Y corresponding to said length value in a database.

Description

technical field [0001] The invention relates to a method for extracting data from a curve function recorded on coordinate paper in image processing technology. The coordinate paper described in the present invention refers to the coordinate paper used on the roller type electric self-recording instrument. Background technique [0002] With the development of computers, many traditional paper record charts have to be digitized and stored through the process of scanning and image recognition. This can not only improve work efficiency, but also eliminate errors caused by human factors, greatly improve the accuracy of parameter selection, promote the digital development process of traditional record chart files, and facilitate analysis and research work. However, the feature points of the paper record chart are not very standard, and are affected by noise, which interferes a lot with the identification work. Theoretically, the traditional line chart is usually a continuous, cl...

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Problems solved by technology

[0004] (2) Due to the hardware of the self-reporter, some structural features of the image are not very obvious, the break point is a fuzzy transitional arc, and the standard of the recognized data is not the standard value, but fluctuates around the standard value , resulting in difficulties in data extraction;

[0010] This method has the following problems: because there are breakpoints in the image, after a cycle, only part of the image is found, and most of the data is missed; in order to solve these problems, it is necessary to continuously generate new starting points and repeat the outline extraction of

[0013] Because for some wavy curves, after the curve fitting is used, each jumping right-angle inflection point will be smoothed out, so that the image data will change, and the key point for the wavy-like graphic data extraction is the coordinate position of these right-angle inflection points , so the curve fitting method cannot be used to deal with

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