MATLAB: Bwareaopen in (Computer vision Toolbox)

Computer Vision ToolboxImage Processing Toolbox

Greetings programmers,

I just need to ask a simple question. In the past, I have used the image processing toolbox and now I want to use the computer vision toolbox. The main question here is that I have used "bwareaopen" to remove pixel from my image. But now I want to use the exact same function but I don't know that command for it in the computer vision toolbox. Can someone please help me? Thank you. I am doing video processing now, if you are asking.

Regards, Akira

Best Answer

The Computer Vision System Toolbox requires the Image Processing Toolbox. So it does not duplicate any functions from the Image Processing Toolbox that I'm aware of - why should it? If you want to use that function, just go ahead and you'll be able to - don't worry about which toolbox it's in.

As an aside, you might take a look at a new function similar to but useful in more and different ways: bwareafilt() . Not that it matters, but it's also in the Image Processing Toolbox.

Related Solutions

MATLAB: What does bwareaopen do

You have 2 connected blobs. The one on the left is 8 pixels big (area of 8 pixels). The blob on the right is 3 pixels. When you called bwareaopen, it got rid of blobs less than 4 pixels. Since the blob with an area of 3 is less than 4, it was removed. Does that explain it? It has nothing to do with connectivity here because all your blobs are 4-connected. Now if you had an extra pixel diagonally connected to the blob on the left, like this:

   A =   0     1     0     0     1     0
         0     1     1     0     1     1
         0     1     0     0     0     0
         0     1     0     1     0     0
         0     1     1     0     0     0
         0     1     0     0     0     0

Now there are 8 eight connected blobs, but 3 blobs if you consider them as 4 connected. The pixel at row 4 column 4 is 8-connected to the blob on the left, but not 4 connected. It would be removed with

bwareaopen(A, 4, 4)

but not with

bwareaopen(A, 4, 8)

because in the second case it's connected while in the first case it's not connected.

MATLAB: Function similar to bwareaopen

The following will remove any areas greater than 8000 pixels:

M3 = M2 & ~bwareaopen(M2,8000);

Another option would be to use regionprops() to get the area of every mask and then remove [stats.Area]>8000, but I think the above 1-line solution is cleaner.

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Related Solutions

MATLAB: What does bwareaopen do

MATLAB: Function similar to bwareaopen

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