Property settings for axes of greyscale histogram on gui?

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Sean 2015-3-2

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评论： Sean 2015-3-4

Im trying to plot a histogram of a grey scale image using a gui, I'm having trouble with the property inspector belonging to the axes which Im using in the gui.fig? how do I get the axes to be 0-256 along the x axis (greyscale) etc?

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Image Analyst 2015-3-2

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After you call bar() or plot(), just use xlim().

xlim([0, 255]);

By the way, gray levels don't go past 255 unless you have a 16 bit image or a floating point image. You can't get 256 with a uint8 image.

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Sean 2015-3-3

在 MATLAB Online 中打开

Here is the code from my * gui.m * file for my histogram push button:

% --- 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
if isfield(handles,'MyImage')
     axes(handles.axes2);  
     A=hist(double(handles.MyImage(:)),255);
     colormap(gray(256));
     colorbar off;
     xlim([0, 255]);
     ylim([0, 3000]);
     plot(A)
   end

Here is the code from the * gui.m * fie which allows you to browse your directory for an image, this is where the 'MyImage' or 'handles.MyImage' comes from:

% --- 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)
%%Initial Method
[filename pathname] = uigetfile({'*.bmp';'*.jpg'},'File Selector');
handles.MyImage = strcat(pathname, filename);
%handles.MyImage=MyImage(:,:,1);
axes(handles.axes1);
imshow(handles.MyImage)
set(handles.edit1,'string',filename);
set(handles.edit2,'string',handles.MyImage);
  %save the updated handles object
 guidata(hObject,handles);