Thank you for the answer @Luiz Otávio Vilas Bôas Oliveira

But still its not clear to me. I too want to extract the plotting information from a 3D plot. Please elaborate the process in detail sir.

I think Mr. Abdulwahab wants to obtain the data points from a picture (i.e. plotted figure).

Posting a sample picture of the 3D plot will help a lot to determine the best way (if possible).

Is the 3d plot a shaded surface? Is it colour coded? Does it have an evenly spaced grid? Is it rendered with hidden lines?

In general it is not possible to extract 3D from 2D unless you have some additional constraint. If you have an evenly spaced grid which has height coded in colour you can try to read the RGB colour in the center of each grid square and count from the edges to find the plane coordinates.

This may be difficult to automate but should be possible.

If t there is no grid you will need to find the 2D coordinates of the points in the projected image and assign each one to the grid coordinates by a transformation. You will also need need to estimate the view projection mapping, maybe from the edges of the plot.

It is not a trivial task, though.

Thanks for your response @Luiz Otavio Vilas Boas Oliveira, I only have samples of the 3D images. My task is to extract the data used to draw the 3D plots. 

I really appreciate your response @Antonio Marcos. Attached are sample images I intend to work with