Estimation of Grain Size in Asphalt Samples using Digital Image Analysis

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


Asphalt is made of a mixture of stones of different sizes and a binder called bitumen, the size distribution of the stones is determined by the recipe of the asphalt. One quality check of asphalt is to see if the real size distribution of asphalt samples is consistent with the recipe. This is usually done by first extracting the binder using methylenchloride and the sieving the stones and see how much that pass every sieve size. Methylenchloride is highly toxic and it is desirable to find the size distribution in some other way. In this paper we find the size distribution by slicing up the asphalt sample and using image analysis techniques to analyze the cross-sections. First the stones are segmented from the background, bitumen, and then rectangles are fit to the detected stones. We then estimate the sizes of the stones by using the width of the rectangle. The result is compared with both the recipe for the asphalt and with the result from the standard analysis method, and our method shows good correlation with those.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Mathematics


  • Machine vision, asphalt samples, size distribution, grain size
Original languageEnglish
Title of host publicationApplications of Digital Image Processing XXXVII
Publication statusPublished - 2014
Publication categoryResearch
EventConference on Applications of Digital Image Processing XXXVII - San Diego, CA
Duration: 2014 Aug 182014 Aug 21

Publication series

ISSN (Print)1996-756X
ISSN (Electronic)0277-786X


ConferenceConference on Applications of Digital Image Processing XXXVII