@@ -14,7 +14,7 @@ Most experiments study a model 2 dimensional (2D) granular system composed of ci
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@@ -14,7 +14,7 @@ Most experiments study a model 2 dimensional (2D) granular system composed of ci
* Finally a circular Hough transform is applied to the gray scale image in Fig.~\ref{fig-diskpos}(b) to find centers and diameters of the discs \cite{peng07jcise}. The transform is an algorithm computing the curvature at each pixel point based on the image gray scale gradient. The curvature will automatically give the center and radius. Then a voting process rules out fake circles and combines circles with close enough centers and similar radii. The final result of particle identification is shown in Fig.~\ref{fig-diskpos}(c), where blue circles indicate particle centers and radii given by the algorithm with errors smaller than $0.02$ times the particle diameter.
* Finally a circular Hough transform is applied to the gray scale image in Fig.~\ref{fig-diskpos}(b) to find centers and diameters of the discs \cite{peng07jcise}. The transform is an algorithm computing the curvature at each pixel point based on the image gray scale gradient. The curvature will automatically give the center and radius. Then a voting process rules out fake circles and combines circles with close enough centers and similar radii. The final result of particle identification is shown in Fig.~\ref{fig-diskpos}(c), where blue circles indicate particle centers and radii given by the algorithm with errors smaller than $0.02$ times the particle diameter.
The procedure described above with results at each step is illustrated in the figure below.
The procedure described above with results at each step is illustrated in the figure below.
