Get data of each signals from an image

Hi Guys

Would you please help me on this. I have an image (three signals) and I would like to get data of each signal separate. The image have been attached.

Thanks for your attention and time.

Answer 1

[Image Analyst]

Try this: http://www.mathworks.com/matlabcentral/fileexchange/36904-matlab-script-for-digitizing-a-published-graph

[Khalid]

I have checked the link but only the code "digitizeGraph" were there and two point on the figure, I will be thankful if an extra example/link will be attached.

[Image Analyst]

I have not downloaded and run the file, but from the description it sounds like it will let you click on as many data points as you want. I'm not sure why it quit after you clicked on only two. Perhaps you need to read the instructions or comments more to see why it's quitting on you. Or ask the author.

Alternatively you can use imfreehand() to hand trace the curves. Display your image with imshow() and then call imfreehand() to get the (x,y) coordinates.