Fractal analysis of the morphology of ice crystal particles in frozen food was attempted for frozen
soybean curd (tofu). From a microscopic image analysis of the ice crystal particles, it was found that
the perimeter of the ice crystal particles could be recognized as a fractal. Effects of the storage time
and storage temperature on the fractal dimension (dp) of the perimeter of the ice crystal particles
were also investigated. As storage time was increased, the dp value tended to decrease. When the
storage temperature was increased, the value of dp decreased more rapidly. The changes
corresponded to the visual observation of the shape change for the ice crystal particles during storage
reported by many researchers, suggesting that the fractal dimension dp could be used as a quantitative
indicator reflecting the surface roughness of ice crystal particles.