How to get the topmost and the bottomost coordinates in a binary image?

2015 7 19
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更新时间：2015 7 20
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I have a binary image with background black...I need to find out the topmost coordinate point for the object and bottomost point also...if there are two or more topmost/bottomost points(if the object is flat at the top/bottom) then I need only the extreme point either the leftmost or the rightmost......can any one help...any help is appreciated

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Image Analyst
Image Analyst 2015-7-20

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Here is the demo I posted in your duplicate question. See the attached demo.

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