Not particularly for polymer membranes but for general purpose image analysis often associated with SEM images related to polymer membrane analysis, you may want to take a look at:

1.  ImageJ/FIJI - The Image Multi-Tool: at http://imagej.nih.gov/ij/ and http://fiji.sc/Fiji respectively

2.  Cell Profiler/Cell Analyst – Image Batch Processing and Data Analysis at  http://www.cellprofiler.org/

3. Volume Integration and Alignment System (VIAS) – Image Stack Alignment Software at http://research.mssm.edu/cnic/tools-vias.html

4. L-measure – Quantitative Morphological Measurements to the Max at http://cng.gmu.edu:8080/Lm/help/index.htm and at http://cng.gmu.edu:8080/Lm/

thanQ! checking it now..

I would like to recommend you take a look at MIPAR, a new software package we just released, available as a very long free trial at http://MIPAR.us. In my of course biased opinion, it is all of the above mentioned packages rolled into one; quite literally when you consider the design and capabilities of its 5 applications. It has proven very valuable to us, as well as many researchers already in its young life, solving a variety of complex image analysis problems . I would love to for us to be of some help to your research! Thanks very much for the question.

Cheers,

John

Hi Shanthana. I use ImageJ, Gwyddion and GIMP. You can to do practically all using them because they complementing each other.

GIMP (as a kind of free Photoshop)

https://www.gimp.org/

Gwyddion (SPM, AFM, SEM, TEM images)

http://gwyddion.net/