Is to find a path around the object that is in the picture. When you know the lines around the objects we are able to calculate the area (size) or to recognize the type of the object. However, finding a valid image edge is not that easy. In particular, finding the edge of the image is low quality. There is a difference between a foreground to a background or with irregular edges around the image brightness, picture, caused by the difference in light intensity from one point to another. If this difference is. The edge of the image, it will be obvious if the difference is less. The edge of the picture is not clear.
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