Visboundaries usage- red outline
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hi i wrote this code
BW = imread('picture'.png)
B = bwboundaries(BW);
figure;
imshow(BW);
hold on;
visboundaries(B)
when i run this, the figure comes out and the boundaries show up but there is a red outline on the border of the image itself. how do i get rid of this line? I have attached a picture to show which line i mean
thank you very much!
回答（2 个）
Image Analyst
2016-3-16
bwboundaries() is meant to work on a binary image, not a gray scale one. So, because you passed it a gray scale image, it took the white part as the foreground region and visboundaries() drew the boundaries around the white regions. To fix, try this
grayImage = imread('picture'.png)
BW = grayImage < 250; % or some value that works.
3 个评论
Sang Wan Kim
2016-3-16
编辑：Sang Wan Kim
2016-3-16
oh sorry about that! wrong picture. i did the bwboundaries on a binary image and i just showed it on the greyimage! i have attached a picture of it showing on the the binary image.
Image Analyst
2016-3-16
Again, it's outlining the white areas because white is foreground. If you don't want that, then invert BW before you call bwboundaries(). See what I did. I took the dark areas, not the bright areas.
Sang Wan Kim
2016-3-16
hupaa san
2016-8-3
0 个投票
Hi, I run matlab example of 'activecontour' command on matlab version R2013a. but when I write 'visboundaries' command it show me this error:
Undefined function 'visboundaries' for input arguments of type 'char'.
and when I enter 'doc visboundaries' in command line window,there is no doc for 'visboundaries' in my matlab too. could u please guide me?
Thanks
1 个评论
Image Analyst
2016-8-3
You can get it when you upgrade. It was introduced in R2015a. Please upgrade, or else use plot().
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