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Abstract: The pressed character is a reflectorized character on the
difference of reflectance. The image quality of the protuberant
character is lower than the generally character on the chromatic
difference of background and foreground. So, the general testing method
based on the binary-scale character can’t adapt for the pressed
character. To solve this problem, a new method of direct gray-scale
feature extraction based on the circular projection algorithm and the
vector sum for testing the quality of the pressed character is
presented. The new method keeps integrity feature of the protuberant
character information dramatically, and can overcome the main shortages
of the traditional method on binary-scale image, such as to depend on a
binarization algorithm extremely, lower performance of anti-jamming. A
limited set of the tag pressed protuberant characters is extracted
feature and tested by the new method. The results show that the proposed
method adapts to the variant gray-scale, location and orientation of the
character, and can yield an excellent performance on the pressed
character quality using to adjust the testing threshold value. It has
highly worth applying to correlated fields.
Key words: Pressed protuberant character Circular projection Vector
sum Quality testing
CLC No: TP274+.3
TP391.43 TP751.1
山东省重点产业化资助项目(0203c06).
Received 20040614, received in revised form 20020041220
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