MATLAB: Multiselect from listbox and apply to subplot

imageimrotatelistbox

Hi. I have a listbox that I populate with say 100 images from a particular directory. I want to be able to select 7 of them, rotate them 90 degrees and then display next to each other in a subplot.

This is my code below for a single image selection, (note that the x position of the position vector for subplot requires the user to change a number in an edit box).

Thanks Jason

    ListOfImageNames = get(handles.listbox1, 'string')
    baseImageFileName = strcat(cell2mat(ListOfImageNames(Selected)));
    fullImageFileName = [folder '\' baseImageFileName];  % Prepend folder.
  
    figure(100);
    file=fullImageFileName
    IM = imread(file);
    IM=imrotate(IM,angle);
    subpos
    x=0.101*(subpos-1)
    positionVector = [0.0+x, 0.8, 0.1, 0.1];
    subplot('Position',positionVector);
    %subplot(4,7,subpos);
    imagesc(IM,[0 5000])
    colormap (gray);
    axis off;
    set(gca,'ytick',[]);
    set(gca,'xtick',[]);

Best Answer

Change the max and min property of listbox. Refer this link : http://www.mathworks.in/help/matlab/ref/uicontrol_props.html#bqxoinq

If max-min >1, you can select multiple elements from listbox.

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Diana - the problem may be with this line of code

imbright=(handles.axes1)+val;

Note that you are adding a value val (calculated based on your slider position to the axes handle and not to the image. I think that what you want to do is save the image (that you have read from file) and then adjust it whenever the slider changes. Your pushbutton1 callback would become somethign like

function pushbutton1_Callback(hObject, ~, 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)

[filename pathname] = uigetfile({'*.jpg';'*.bmp'},'File Selector');
fullname=[pathname, filename];
ImageFile=imread(fullname);
axes(handles.axes1)
imagesc(ImageFile);
axis off;
handles.image = ImageFile;  % <--- new line to save the image to the handles object
guidata(hObject, handles);  % <--- new line to save the updated handles objet

Your slider callback would then look something like

function slider1_Callback(hObject, ~, handles)
% hObject    handle to slider1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'Value') returns position of slider
%        get(hObject,'Min') and get(hObject,'Max') to determine range of slider
if isfield(handles, 'image')
    val=0.5*get(hObject, 'value')-0.5;
    imbright=double(handles.image)+val;               % <--- new line, note the cast to double
    imshow(uint8(imbright), 'Parent', handles.axes1); % <--- new line, note the cast to uint8
end

Note the casting of the image to double before we add the val, and then the cast back to uint8 before we show it on the axes. One or both may not be necessary depending upon the original data type of the image.

MATLAB: Listbox, get items below selection

You need to load the image names into the cell array before you go into the loop:

ListOfImageNames = get(handles.listbox1, 'String');

Then in the loop I think you can just extract the string:

baseImageFileName = ListOfImageNames{n};
fullImageFileName = fullfile(folder, baseImageFileName);  % Prepend folder.

Best Answer

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