In order to conduct more details analysis in terms of sand distribution ins sensor space
is necessary to analyse the reconstructed images. On Figure 6 are presented images for two
cases – loose and dense initially sand concentration – obtain for different stage of silo discharging process. The reconstructed images are not very impressive. The part of capacitance
measurements, especially for adjacent electrodes, was direct cause of error in image
for area close to the silo wall. Applied LBP image reconstruction algorithm should be in
future work replaced by more sophisticated methods. However the differences, which was
visible on graph presented on Figure 5, are visible on images. The sand concentration in
funnel area is lower for initially dens sand (≈ 0.75) comparing to initially loose sand
(≈ 0.95). In order to estimate the wide of funnel area is necessary to conduct image processing
and applied iterative image reconstruction methods.