How to update images in GUI?

I have a binary image with 4 objects. I am trying to remove objects by using imfreehand function. But the problem is: First I delete OBJECT2 using imfreehand. Then when I tried to delete OBJECT3 , OBJECT3 is deleted but again OBJECT2 reappeared in the image. How to update image after each operation?

[Walter Roberson]

Please show your code of how you delete objects.

[rupam baruah]

h=imfreehand();

bw=h.createMask();

handles.bi=handles.i4;

handles.bi(bw)=0;

imshow(handles.bi);

guidata(hObject,handles);

...... Here i4 is the initial image ....

Answer 1

[Walter Roberson]

Is that the same code as you use for OBJECT3 ? If so then the problem is that you are resetting to the original image handles.i4 each time. If you change the assignment to

if ~isfield(handles, 'bi')
   handles.bi = handles.i4;
end

then it will only be done if it has not been done before and otherwise will proceed to work with the existing handles.bi that had the object deleted from it already.