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Machine Vision

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Letter&unregular character 15% missing detect

Hello, vision expert Now I work on vision inspect of letters printed on plastic cover.Test purpose is to detect the unclear or 15% missing ..letters. I am new to vision and only can find one method is to use pattern match and then get the match scores,if lower than 850 which will be judged to failed. Is there any other solution? Your suggestion is appreciated. Attached is keyboard screen similar to my production.tks
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