Image Processing
Simpleware software was used in this study to create masks for each domain based on measured intensity groups. The total volume of the asphalt mixture sample was calculated for the complete intensity range, 0 to 255. The upper limit for the air void intensity range was determined by trial and error to match the measured air void contents.
After the thresholds for each domain were determined, masks with different colors were assigned to clearly visualize the boundaries between each domain.