MATLAB: How to remove the boundary around an object

boundarycannyedgeimage processingmaximumpixelremove noise

I have a dicom Image and I applied edge command on it (canny) but now I want to remove the edge or boundary around the object.I tried to use some for loop for it but it doesn't work properly. Is there any other command so that I can use? and also I want to remove some noise around the image,what should I do? The main thing that I want is to find the maximum pixel of this image,but because there is some highlight boundary around the image I can not find the maximum which is inside the picture. Is there any other way for finding maximum pixel inside the image?

Best Answer

Please have a look at regionprops and bwboundary

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MATLAB: Removing the boundary objects

If you have the Image Processing Toolbox, the function imclearborder is what you want.

MATLAB: Creating mask around line

There are infinitely many rectangles enclosing a given line. The particular rectangle you want, and the rule you use to get its vertices, is not clear to me. Below is a way of finding a rectangle with edges parallel/perpendicular to the line and at a distance of masksize from the nearest endpoint.

%data
pt1=[30,40];
pt2=[57,44];
masksize=2;
%engine
dirvec=pt2-pt1;
  dirvec=dirvec/norm(dirvec);
perpvec=[dirvec(2), - dirvec(1)];
  perpvec=perpvec/norm(perpvec);
    %masksize=masksize/sqrt(2);  
vertex1 = pt1 + masksize*(-dirvec+perpvec),
vertex2 = pt1 + masksize*(-dirvec-perpvec),
vertex3 = pt2 + masksize*(dirvec+perpvec),
vertex4 = pt2 + masksize*(dirvec-perpvec),

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MATLAB: Removing the boundary objects

MATLAB: Creating mask around line

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