How to reset the current axes to display either color or grayscale image on the same axes in MATLAB?

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Gopichandh Danala
回答： Gopichandh Danala 2017-7-7
Hi,
I have some grayscale images, which after some segmentation I converted a section to color for display purposes. But I cannot display a color image on the axes after I display a grayscale image on the same axes.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global imB
global imF
global finalSegment_LE
i=38;
% imB = img2{i} ;% Background original image
tempSeg = finalSegment_LE{i};
tempSeg(finalSegment_LE{i} ==0) = min(finalSegment_LE{i}(:));
imF = tempSeg;
cla(handles.axes1,'reset');
[~,~] = imoverlay(imB,imF,[],[],'hsv',0.8,handles.axes1); % color image..
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% global imB
temp = imread('cameraman.tif');
cla(handles.axes1,'reset');
axes(handles.axes1);
imshow(temp,[]) % grayscale image...
If I press pushbutton1 first I see a color image, but after I press pushbutton2, the axes become grayscale and even when I press the pushbutton1, It still displays a grayscale image instead of the color image.
Thanks,
Gopi

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回答（1 个）

Gopichandh Danala
I figured out the solution, we can set colormap and then imshow to display respective images..
% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
[img,cmap] = imread('peppers.png');
cla(handles.axes1,'reset');
colormap(handles.axes1,cmap);
axes(handles.axes1);
imshow(img,[]);
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% global imB
temp = imread('cameraman.tif');
cla(handles.axes1,'reset');
colormap(handles.axes1,gray);
axes(handles.axes1);
imshow(temp,[])

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