pe.m

This code extracts the points from a curve saved in image format. The output will be the points in the dimension of the original carve.
The inputs are: r= the curve acquired by the command ‘imread’ in workspace, xi=initial horizontal value, xf=final horizontal value, yi=initial vertical value and yf=final vertical value of the of the curve on the original axis.
The curve should be in black color and nothing else should be in black in the image. For example, toward this aim, the axis could be removed by using Microsoft Paint or Pain.Net software, if it is in black. The curves could be simply changed to clack by the mentioned paint software if is not presented in black color (simply change the color to black or draw a black line on the curve by the pen in Paint software).
For better understanding, the code plots the extracted points by employing
'plot' function as well. The 'plot' function is written at the last line of the code.
Written by Kiarash Ahi on 9/18/2014.