How can I extract/detect, separate the wall from the window using vertical and horizontal line detection?

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L 2019-7-12

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编辑： L 2019-7-15

Also, how can I separate the rectangular shape from the wall?

The goal is to separate the wall area from the window and later the rectangular shape area from the wall (if there is a shape) for any window/wall situation. Is it possible if I don't know in advance the dimensions, color, width of the window frame etc., only the shapes (which contain mostly horizontal and vertical lines)?

I hope someone can help me with this.

Thank you in advance!

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Answer 1

Image Analyst 2019-7-13

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Try edge() and imfill().

Is it your assignment?

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L 2019-7-14

Hello Image Analyst,

Thank you for the response.

I have tried with edge function earlier with the Sobel detector (this results looks good), but the problem is later. When I use the imfill() function, with 'holes' option I've got the same image like after the edge detection. When I use the 'conn' option with any parameter, i've got an almost pure white image. This was my first intention.

Also, I have tried with simple derivation in x and y directions (to highlight only the edges of the window/wall border), but the derivation result was worse than with the Sobel detector. Now, I am stucked. The only reasonable intermediate result is the image after the edge() function. I can't find a way to connect somehow the border lines around the window/wall.

I tried with morphological gradient too. In this case I saw somehow the main lines

Yes, this is an assignment from my mentor, I was searching the Matlab Answers, but didn't find anything similar. Naturally, I am not expecting to someone else solve this, I would like to get some tips.

Now, I am thinking about erosion to highlight somehow the vertical and horizontal lines. What do you think about that?

I think the morphology should be the easiest way to do this areas separation.

I have attached you some image examples of the same window/wall.

Thank you in advance.

L 2019-7-15

编辑：L 2019-7-15

Hello Image Analyst,

Is it possible to extract the window, or the wall (or the shape) using the bwconncomp(), regionprops() and checking the bounding box?

Thank you.

L 2019-7-15

编辑：L 2019-7-15

Hello,

I have reduced the scale and I've got the 2D and 3D edges with Sobel detector. Now, how can I separate/extract and fill the rectangle area on the right side of the long vertical line?

Thank you.

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