MATLAB: Less connected pixels from gray scale image

connected pixelsImage Processing Toolbox

i have a gray scale image that contains a box of white and a text. i need to convert only text because those pixels are less connected than box pixels. if i find an of the command for connected pixels such as bwareaopen (bw, 8) or 4 pixel connection i can even get box pixels as well but i only want to label those pixels that has less connection. need help please.

Best Answer

Label the more connected pixels. The pixels that did not get labeled are then the less-connected pixels.

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MATLAB: Less connected pixels should be removed from image

Your definition of 'less connected' is not clear to me. However, if you want just the big round component, you can use regionprops to find the largest component and remove the smaller components using bwareaopen.

Here's an example:

% read image and convert to binary.
im = imread('http://www.mathworks.com/matlabcentral/answers/uploaded_files/7873/fake.png');
bw = logical(rgb2gray(im));
% use regionprops to find area of all components.
cc = regionprops(bw,'Area');
% find area of largest component.
maxarea = max([cc.Area]);
% use bwareaopen to remove smaller components.
out = bwareaopen(bw,maxarea);

Hope this helps!

MATLAB: Connected points

regionprops() can return the indices of the points for each region.

Or more simply,

find(a==2)

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Related Solutions

MATLAB: Less connected pixels should be removed from image

MATLAB: Connected points

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