Abstract: A
novel approach of printed circuit board (PCB) image locating is
presented. Based on the rectangle mark image edge of PCB, the
features is used to describe the image edge and the fractal
property of image edge edge is analyzed. It is proved that the
rectangle mark image edge of PCB has some fractal features. A
method of deleting unordinary curve noise and compensating the
length of the fractal curve is put forward, which can get the
fractal dimension value from one complex edge fractal property
curve. The relation between the dimension of the fractal curve
and the turning angle of image can be acquired from an
equation, as a result, the angle value of the PCB image is got
exactly. A real image edge analysis result confirms that the
method based on the fractal theory is a new powerful tool for
angle locating on PCB and related image area.
Key words: Machine vision Fractal property
curve Dimension compensation Fractal dimension Angle locating
Manuscript
received on March 19, 2001; revised manuscript July 5, 2001
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