Abstract： A new method was proposed to evaluate weld formation based on binocular stereo vision. First, visual images that contain all information of weld formation were seperated from the images acquiced. With similarity measurement function, and with the size of matching window and similarity threshold being confirmed, an area matching algorithms was established based on gray value to measure weld formation. Next, three dimensional coordinates of weld formation was established by means of matching disparity map, based on which the extraction of weld width and weld hight and the reconstruction of weld formation images were accomplished in three dimension. Finally, according to the requirement of Chinese Standard GB10854—89, for the size examination of steel structure, the indexes to evaluate weld external quality were set up. The four indexes are the difference between maximum and minimum of weld width, the difference between maximum and minimum of weld height, the full degree of weld filled and straightness of weld formation. Weld test results show that weld formation can be evaluated by means of visual measurement method and the indexes.
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