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Did you find anything , i am trying to find the surface porosity of a concrete block surface but I can't set the scale as we did not put it in image as shown above any work arounds?

There is not a reference for the method. I suggest making sure that you document all the settings you use in your written procedure. Of particular importance is the circularity and size parameters.

@@DrFoundry Thanks for the reply...I need to mention the reference while writing journal paper and i am not able to find any paper which mention this method....Can you please suggest me any book or any journal paper which use this method.

@@RAMABALHARA hi bro Did you find anything , i am trying to find the surface porosity of a concrete block surface but I can't set the scale as we did not put it in image as shown above any work arounds?

A couple things. You may want to look at my tutorial on measuring porosity and inclusion. ImageJ does not really have a great way of doing what you are asking for maximum and minimum diameters. You need to use the Analyze Particles command, paste the results into Excel, and use the min() and max() functions in Excel to find those values. As for volumetric percent, stereographic projection theory demonstrates that volume percents are roughly equal to the area percent. Assuming you are looking at a nano-particle composite, you can simply use threshold to select the particles and have ImageJ determine the area%. Hope that helps.

kalau rumus lever rule bisa lu searching aja bro, di google banyak kok. FYI, itu dia hitung secara teoritis nya trus dibandingin dengan hasil ImageJ

If you have ribbons you probably want to look into measurement methods that are designed for anisotropic samples such as verticle sectioning and cycloid intercept measurements. Check out more info in this book: The Quantitative Description of the Microstructure of Materials.