how to saving image of quadtree from axes

Question

Elsya Nurul Aini 2012-2-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/30666-how-to-saving-image-of-quadtree-from-axes

采纳的回答： Chandra Kurniawan

在 MATLAB Online 中打开

Dear all,

I have a problem in saving quadtree image from gui axes.

I've written this code to calculate quadtree decomposition

qt = qtdecomp(im,t);
blocks = repmat(uint8(0),size(qt));
for dim = [512 256 128 64 32 16 8 4 2 1];    
numblocks = length(find(qt==dim));    
if (numblocks > 0)        
  values = repmat(uint8(1),[dim dim numblocks]);
  values(2:dim,2:dim,:) = 0;
  blocks = qtsetblk(blocks,qt,dim,values);
  end
end
blocks(end,1:end) = 1;
blocks(1:end,end) = 1;
hold on;
axes(handles.quadtree); % axes for displaying quadtree image in gui Matlab
imshow(blocks,[]);

Then, i wanna save the image by calling this function

function save_Callback(hObject, eventdata, handles)
% hObject    handle to simpan (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
ImQuadtree = getimage(handles.quadtree);% getting image from quadtree axes
[nm_file,nm_dir] = uiputfile({'*.jpg';'*.bmp';'*.png';'*.tif';'*.*'},'Saving Quadtree Image');
if isequal(nm_file,[])
  msgbox('The Image is not Stored!','Warning','warn');
elseif isequal(ImQuadtree,[])
  msgbox('There is no image to stored!','Warning','warn');
else
  imwrite(ImQuadtree,strcat(nm_dir,nm_file));
  msgbox('Quadtree Image Successfully Stored','Save','help');
end

The problem is when the image is successfully saved, the image result is a black image. There is no block on these image. So, how i can save the image block??