How to select an object if you click it?

Dear all,

I have an image the contains few objects as I show here. I want that if the user click inside an object using the mouse then this clicked object will remain and all other objects will be removed from the image.

Is there someway to do that?

Any help will be appreciated.

Meshoo

Answer 1

[Image Analyst]

Yes. Follow these steps

1. label the binary image with bwlabel
2. call [column, row] = int32(ginput(1)) to let the user click somewhere
3. get the label with labelNumber = labeledImage(row, column)
4. extract the object with extractedObject = ismember(labeledImage, labelNumber)
5. Make it binary again binaryImage = extractedObject > 0;
6. display it with imshow(binaryImage, []);

[Meshooo]

clear all
clc
%

I = imread('regular_shapes.tif');
%
BW = im2bw(I);
%
figure, imshow(BW);
hold on
[yCenter, xCenter] = ginput(1)
hold off

%
b = bwboundaries(BW);
%
[L, num_Obj] = bwlabel(BW, 4);
%
for k = 1:num_Obj;
    Obj = L ==k;

      bb = b{k};

      X_obj = bb(:, 1);
      Y_obj = bb(:, 2);

      Selec{k} = inpolygon(xCenter,yCenter,X_obj,Y_obj); 
  end

Selec;
%
Selec = [Selec{:}];
[value,index] = max(Selec);
%
Obj = L ==index;
%
figure, imshow(Obj);

[SC P]

Error came while running script"

Brace indexing is not supported for

variables of this type.

Error in boundin_box_26_11 (line 75)

Selec = [Selec{:}];