Hello Shohel,

Maybe this link can help you.

https://www.youtube.com/watch?v=JQAZ--c9YfI

Dear Dr. Shohel Rana,

I suggest you to have a look at the following notes/videos.

-To calculate grain size by Image J:

Particle Analysis Using ImageJ by Northwestern University

Available at: http://www.nuance.northwestern.edu/docs/epic-pdf/Particle%20Analysis%20Using%20ImageJ.pdf

Grain size analysis - Image Analysis - Image.sc Forum

Available at: https://forum.image.sc/t/grain-size-analysis/27470

Video at: https://www.youtube.com/watch?v=EkYBbeRXDPw

Video at: https://www.youtube.com/watch?v=YPQsCjHzWg4

Video at: https://www.youtube.com/watch?v=go8W_teVUC0

-To calculate grain size distribution:

Grain size distribution of irregular particles - Image Analysis ... Forum

Available at: https://forum.image.sc/t/grain-size-distribution-of-irregular-particles/10543

Video at: https://www.youtube.com/watch?v=_oYVjuvq2HQ

Video at: https://www.youtube.com/watch?v=JQAZ--c9YfI

Video at: https://www.youtube.com/watch?v=KGM-e78NbVI

Good luck and best regards, Pierluigi Traverso.

@ Pierluigi Traverso thanks for your detail information

Thank you very much for suggesting me.

I suggest asking Giulia Marchetti

Have a look at this:

Preprint Mapping riverbed sediment size from Sentinel 2 satellite data

Not ImageJ, but grainsize distribution measurement from images:

https://basement.ethz.ch/download/tools/basegrain.html