An extended fractal dimension is introduced and applied to several fig
ures whose fractal images are similar in a statistical sense. The box-
counting method by computer-aided image analysis is adapted to measure
the extended fractal dimension of patterns. When applied to an ideal
fractal figure, the value measured with this method closely agrees wit
h the theoretical value. Image information such as the number of voids
and void sizes in twenty-nine different kinds of patterns is obtained
by image processing. All these patterns are used as sample patterns f
or sensory evaluation and fractal analysis. A good correlation exists
between the fractal dimension and the sensory evaluation value for bea
uty and complexity of patterns.