Data-Extraction-From-Graphs

Introduction

A python based program which extracts coordinates of required points form a graph given in pdf format. The program is a semi-automated tool that makes this process extremely easy.

Demo

Clone this repo and make a new folder "graphs" and put all the images in pdf file in that folder and then follow the below steps:

• Enter the index of the image you want to plot the graph for from the "graphs" folder. Put your image in that folder.
• The graph image will open, if not watch it somewhere behind the open windows.
• DO NOT CLICK TWICE ON THE POPED UP IMAGE BEFORE ANSWERING THE INPUT.
• PRESS o to select origin of the graph. After selecting origin, PRESS 'x' to select any point on x-axis (click once).
• Enter the distance between origin and the point on x-axis which has just been selected.
• Enter the zero offset if present.
• After answering the length of line segment selected, zero offset and pressing enter PRESS 'y' for y-axis calibration and follow the same procedure as used for x-axis.
• After completion of caliberation now PRESS 'p' to select data point on graph for which coordinates has to be digitized.
• Click s to save the image of graph with selected points.
• Click f to finish.
• Check "plotDataFiles" folder for .csv file generated and "plots" folder for the saved map image.

Features

• User can select as many coordinates according to the requirement.
• Returns coordinates of any type of curve irrespective of graph background, type, color.
• Works for mutliple curves too.
• Returns output coordinates upto 6 decimal precision.
• Output is saved automatically in the excel sheet.

Programming Language Used

• Python

Libraries Used

• NumPy
• Open CV
• CSV