Ivan César Martins,  Alejandro César Frery,  Viviane Carrilho Leão Ramos. 

Particle size determination is usually done by laboratory tests, such as sieve analysis and sedimentation. In this paper, we extract this information by image acquisition, processing and analysis, and we show it is possible to estimate soil gradation using only these data.

http://www.lbd.dcc.ufmg.br/colecoes/wvc/2010/0051.pdf

Processando consulta.