How to use slider bars to view images from a dataset?
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Let's say I have loaded a dataset of 100 images and I want to view those images by scrolling the slide bar. If I set my slide bar to 25%( where min limit of slidebar is 0% and max limit is 100%) then 25 images out of 100 should be displayed likewise if I scroll my slidebar upto 89% then 89 images should be displayed. I tried implementing it by loading an array but it doesnt work.
7 Comments
Rik
on 27 Jun 2019
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Answers (2)
Rik
on 22 Jun 2019
I didn't implement a case for the 0 position, so I just set the range limits from 1 to 100.
%Load an example image
a=imread('cameraman.tif');
%Replicate 100 times
database=repmat(a,1,1,100);
N_images=size(database,3);
%prepare figure and guidata struct
h=struct;
h.f=figure;
h.ax=axes('Parent',h.f,...
'Units','Normalized',...
'Position',[0.1 0.1 0.6 0.8]);
h.slider=uicontrol('Parent',h.f,...
'Units','Normalized',...
'Position',[0.8 0.1 0.1 0.8],...
'Style','Slider',...
'BackgroundColor',[1 1 1],...
'Min',1,'Max',N_images,'Value',1,...
'Callback',@sliderCallback);
%store image database to the guidata struct as well
h.database=database;
guidata(h.f,h)
%trigger a callback
sliderCallback(h.slider)
function sliderCallback(hObject,eventdata)
h=guidata(hObject);
count=round(get(hObject,'Value'));
IM=h.database(:,:,1:count);
IM=permute(IM,[1 2 4 3]);%montage needs the 3rd dim to be the color channel
montage(IM,'Parent',h.ax);
end
0 Comments
Bjorn Gustavsson
on 21 Jun 2019
Perhaps have a look at: Imthumb, it might not be exactly what you want, but it might be close enough for you to easily modify...
HTH
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