How to extract coordinate values from a graph in Matlab

I have a graph in a png picture and I want to extract the coordinates from this graph and then I want to draw it by my self in Matlab.

Answer 1

[Image Analyst]

Try this:

GRABIT - digitize images of graphs

Matlab script for digitizing a published graph - File Exchange - MATLAB Central

and there are even more in the File Exchange.

[Sadiq Akbar]

Thanks a lot for your help. I downloaded the file and unzzipped it. Then it needed a jpg image, so I converted my png picture into a jpg picture. Then I tried to run it like the following:

>> digitizeGraph('Figure4.jpg',3)

But it gave me the following error:

Error using image

Color data must be numeric or logical values.

Error in imagesc (line 52)

hh = image(varargin{:}, 'CDataMapping', 'scaled');

Error in digitizeGraph (line 13)

imagesc(imageName);

[Image Analyst]

I am not the author of that file, nor have I ever used it. Contact the author.

[Sadiq Akbar]

ok dear thanks for your help.