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Creating masks for objects in an image

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Stewart Tan
Stewart Tan on 3 Sep 2019
Commented: Image Analyst on 3 Sep 2019
I've seen some people who managed to create a mask for objects in an image and I would like to know how it's done. For example, below:
horses_copy.png
horses_gt_r0_gcs500.png
Where four horses are selected and masked as such, where the shapes are very well preserved. Could anyone explain how it's done or is there any matlab functions that allow me to do so?
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Stewart Tan
Stewart Tan on 3 Sep 2019
@Matt J I guess the manual boundary tracing tool? Also, i forgot to mention that i have the coordinates of the blocks where the regions are similar which are the horses. Sorry bout the confusion.

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Answers (1)

Image Analyst
Image Analyst on 3 Sep 2019
Try the Color Thresholding App in HSV color space. Get everything with blue as one mask. Then make another mask with stuff with low saturation to get the building. Clean up each mask with imfill(), bwareafilt(), or bwareaopen() if needed. Then OR the two masks together and invert. You should be left with the horses.
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