segment all the images in the lisbox

I've multiple image in the listbox, 2 axes and 2 push button that is the segmentation method.(threshold and watershed) How can I segment all the images in the listbox and the orignal image is display in one of the axes and the segmented image in another axes. when click on different image the segmented image will actually correspond to the original image. All help is appreciated.

Answer 1

[Walter Roberson]

projectdir = 'the/directory_that/the/images/are_in';

selected_image_idx = get(handles.listbox1, 'Value');
all_image_names = cellstr( get(handles.listbox1, 'String') );
selected_image_names = all_image_names(selected_image_idx);

num_selected = length(selected_image_names);

for K = 1 : num_selected
  this_name = selected_image_names{K};
  this_image_file = fullfile( projectdir, this_name );   %presuming the stored name includes the extension
  this_image = imread(this_image_file);
  imshow(handles.axes1, this_image);      %original image
  title(handles.axes1, ['Original image: ', this_name ];
  title(handles.axes2, 'Segmentation being computed');
  imshow(handles.axes2, nan(1,1,3));      %blank output while we compute segmentation
  drawnow();
  segmented_image = segment_one_image(this_image);
  imshow(handles.axes2, segmented_image);
  title(handles.axes2, ['Segmented image: ', this_name ];
  drawnow();
end

[Pui Choo Wong]

hi this is my code how do i add in the for loop with the segmentation?

function Thresholding_Callback(hObject, eventdata, handles)

% hObject handle to Thresholding (see GCBO)

% eventdata reserved - to be defined in x future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

% index = get(handles.listFiles,'value');

% Index = (handles.I{index});

% fileNames = get(handles.listFiles , 'string')

file = get(handles.listFiles , 'value')

file = (handles.I{file});

selectfiles = length(file);

numberofselectedfiles = length(file);

listofimagenames = get(handles.listFiles,'string');

for x = 1:selectfile

level = graythresh(handles.I{x});

handles.I2{x} = im2bw(level);

LB = 1500;

UB = 6000;

handles.I3{x} = xor(bwareaopen(handles.I2{x},LB), bwareaopen(handles.I2{x},UB));

axes(handles.axes2);

imshow(handles.I3{x});

Area = bwarea(handles.I3{x});

set(handles.Area,'string',Area);

end

guidata(hObject, handles);

[Walter Roberson]

You isolate the code that does the segmentation and put it into a function named segment_one_image .

[Image Analyst]

You are doing segmentation with graythresh(), and you DO already have it in a loop over all selected files, so your question doesn't make sense.

http://www.mathworks.com/matlabcentral/answers/13205#answer_18099

[Pui Choo Wong]

the segmented image does not correspond with the original image. after segmenting the first image the subsequent image did not get segmented.

[Image Analyst]

You'll have to explain it better than that. Of course the segmented image doesn't look like the original - it's a binary image, not a gray scale or color image. You forgot to attach any images that illustrate your assertions. And there is no reason that you shouldn't be able to do the second and subsequent images in your loop. You should get a new Area for each image. Of course you're not storing them in an array so Area will get overwritten each time and after the loop just contain the last Area computed.

[Pui Choo Wong]

sorry I wasn't clear. What I meant is it only the first image in the folder is segmented image. The rest of the images are not segmented. Means only Image 01.jpg is segmented other images are not segmented.

Answer 2

[Image Analyst]

That's exactly what MAGIC does. http://www.mathworks.com/matlabcentral/fileexchange/24224-magic-matlab-generic-imaging-component Either use that code, or copy and paste the code from the "Go" button into your "Go" button that starts the batch process.

[Pui Choo Wong]

my image is in grayscale i got an error

[Image Analyst]

You forgot to post the error. I've used MAGIC myself with gray scale images and it works fine. I can't help you unless you post the error.