BACKGROUND RECTIFICATION AND FEATURE EXTRACTION OF IMAGE IN A SPOT WELD OF AL ALLOY X-RAY DETECTION
T.Gang;J.Zhang ;M.B.Zhang and F.X.Liu (1)AWPT National Key.,HIT,Harbin 15001,China 2)State 159 Factory,China)
Acta Metallurgica Sinica (English Letters) . 2000, (1): 75 -79 . 

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