MATLAB: Bwconncomp, use the ids assigned by Matlab in a image.

bwconncompuse the ids assigned by matlab in a image

Hi, when I use bwconncomp function, this create a cc 1×1 struct

Connectivity 8 ImageSize [145 145] NumObjects 7 PixelIdxList 1×7 cell

is there a way to get the numobjects value using a function to can use this one to create others functions or tasks?

Best Answer

You can use bwlabel instead. Is this what you mean?

[labeledImage numberOfObjects] = bwlabel(binaryImage);

or maybe you want the labelmatrix() function?

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MATLAB: Dilation of specific objects

First, I would label regions in your image:

   bwl = bwlabel(img,8);

Area of regions:

   a = regionprops(img,'area');
   a = {a.Area}; %turn into cell array

Create a mask for what you want to be dilated:

   xarea = 10;
   idx = find(cellfun(@(x)x<xarea,a));
   bwl2 = sum(reshape(cell2mat(arrayfun(@(x)x==bwl,idx,'un',0)),size(img,1),size(img,2),[]),3);

Dilate the mask:

   bwl2 = bwmorph(bwl2,'dilate',1);

And finally, apply this dilated mask back to the original bw image:

   img = img | bwl2;

MATLAB: When working with an image and filling in gaps, do you only choose one: imerode, imdilate, imopen, imclsoe and imfill

Assuming your foreground blobs are white/true/1, imerode and imopen will enlarge the black areas and eat away at the white areas. imdilate and imclose will enlarge/smooth the white areas and fill in black areas near borders/perimeters. imfill() fills in black islands in a white blob. Usually you use only one: imfill. However if you want your blobs to have a bit smoother outline, then you can use imclose() before imfill().

Best Answer

Related Solutions

MATLAB: Dilation of specific objects

MATLAB: When working with an image and filling in gaps, do you only choose one: imerode, imdilate, imopen, imclsoe and imfill

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