Full fill a rectangle shape in an image

Question

Le Vu Bao 2019-9-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/481164-full-fill-a-rectangle-shape-in-an-image

评论： Le Vu Bao 2019-9-20

采纳的回答： darova

Hi,

I'm processing an image (please see attachment).

I tried to full fill the white rectangle (which is currently covered by the water drop shaped black shadow).

How can I remove the shadow to get the fully rectange?

I have the Boundary polyshape of white shape.

This is the polyshape I have:

And the image:

Thanks

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rough93 2019-9-19

Create a vector between two points on the left edge above and below the drop, create a for loop for every row between column to the right to color it your chosen color. You can set additional paramters to limit how much is colored.

Le Vu Bao 2019-9-20

Yes, I thought about this approach. I tried to detect 2 upper and lower points of the drop. But the corner detector in Matlab returned far more points (7 corners is the lowest). Not until I can detect these 2 points I think cannot continue this solution.

Could you give more detail way to detect these two points out of other corner points?

Although, I finally completed my goal using boundary function. I am really curious how to get it done in this way

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