Description: In the image classification and recognition algorithm, the extraction target calculate the geometric characteristics of the target image usually requires minimum bounding rectangle for the length, width and other attributes. For this feature, proposes a minimum bounding rectangle extraction target image algorithm uses vertex chain code and discrete Green' s theory combination. The algorithm can be calculated only according to the target chain, the vertex coordinates of the vertical or horizontal direction on the area and centroid of the spindle. Vertex chain code based and discrete Green' s spindle and spin method can quickly find the target minimum bounding rectangle. Experimental results show that the method of computing the speed of rotation of about 2 times the existing algorithms, surpasses the rotation speed of the spindle Rapid Method 2 times
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