For rice the effective
particle density and the bulk density are the most relevant definitions [6]. For the
determination of the effective particle density the volume is determined by the total rice
kernel (solid material, including the internal voids). For the determination of the bulk density,
also the space between the kernels is included in the volume. With flatbed scanning a 2D
image is obtained of the rice kernels. To calculate the effective particle density a relation has
to be found between the area of the rice kernels in 2D image and its volume