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dm642: the method of the connectivity of the binary image

Hi,all

              I am doing some image processing on evmDM642. And now,I built a binary image of the face,the pixel of the face area is set to 0xff,and the other area is set to 0x00,I want to paint a ractangle for this face area.So,there is have the method of the connectivity of the binary image.The IMGLIB have this relative function? Or there have some methods to perform this? 

642: