How to find the bounding box around the tip of needle

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prashant singh 2017-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/354227-how-to-find-the-bounding-box-around-the-tip-of-needle

关闭： John D'Errico 2017-8-27

I have image set of a needle. I am posting two images as an example. I want to find the tip of the needle and draw a bounding box around it. The needle tip keeps on growing and I want to know how can I draw continuous bounding box around the tip in each images.