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Optical granulometry
Dohnálek, Martin ; Richter, Miloslav (referee) ; Kunz, Jan (advisor)
This diploma thesis deals with the topic of macroscopic particle size detection during freefall using computer vision. The measurement results can be used to verify other granulometric methods, or in the industry as a simpler alternative to conventional methods. Particle sampling takes place in flight and particles may overlap. Because of this, the data is recorded by a high-speed camera on the scene with fit-to-purpose lighting. The components of the proposed algorithm are: background removal, localization of potential particles, segmentation using the watershed method, determination of particle size. Using image correlation, the fall velocity and the number of particles in the sample are also determined. Experiments confirmed that the measured particle sizes of the sample correspond to the sizes determined by the traditional sieving method and are consistent even on repeated measurements. The correctness of the speed determination was verified by a theoretical calculation. When determining the effect of the sample’s dustiness on the quality of detection, resistance to the presence of dust up to 10% of the sample weight was found.
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