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isolating the noise point, so the edge information is retained. Blur edges and
numerous noise points are the salient features of remainder movement images.
Follow-up contrast tests also indicate that the filtering effect is better improved when
the comparing area is 2×2 rather than 3×3.
Fig. 3.
Overall block diagram
Fig. 4.
Image pre-processing flow
a
) Original image
b
) median filter
c
) Sobel
d
) contrast enhancement
e
) Prewitt
Fig. 5.
The original image and filtered images
2)
Edge Detection of Remainder Image
The edge detection of remainder images is made on the filtered images in this system.
The edge detection algorithm should have the following features:
a
) The detection effect on spherical graph is important almost remainders used are
spherical.
b)
The detection effects on salient points of the graphic edge are important as the
edge detection is the basis for the follow-up centroid extraction algorithm and the
positions of salient points are very important.
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