How to select a regionprops from a popup menu in a GUI?

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Meshooo
Meshooo 2014-1-23
编辑： Meshooo 2014-1-23
Dear all,
I am building one GUI which include a popup menu for a 'regionprops' function that I need. I am trying to call the type of 'regionprops' after clicking a push button but it is not working. My code is as follows:
popup_2_Value = get(handles.popupmenu2, 'Value');
if popup_2_Value == 1
RegPropType = 'Area';
elseif popup_2_Value == 2
RegPropType = 'MajorAxisLength';
elseif popup_2_Value == 3
RegPropType = 'MinorAxisLength';
elseif popup_2_Value == 4
RegPropType = 'Perimeter';
elseif popup_2_Value == 5
RegPropType = 'Orientation';
end
%
X = im2bw(I); %binary image of the input
CC = bwconncomp(X); %Connected components
mal = regionprops(CC,'RegPropType'); % normal code format is --> mal = regionprops(CC,'Area');
mal = vertcat(mal(:).RegPropType); % normal code format is --> mal = vertcat(mal(:).Area);
This error message appears "Error using regionprops>getPropsFromInput"
Any idea how to solve such problem?
With kind regard,
Meshoo

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采纳的回答

ES
ES 2014-1-23
From what I see, you should have done
mal = regionprops(CC,RegPropType)
instead of
mal = regionprops(CC,'RegPropType');%Note the missing quotes
Since the variable RegPropType has the required string like 'area' or ' Perimeter' etc. When you pass as 'RegPropType', this string itself is passed, and not the value inside the variable RegPropType.
  2 个评论
Meshooo
Meshooo 2014-1-23
Yes, you are right for the first part. As you said it should be
mal = regionprops(CC,RegPropType)
But how can we do the following second part
mal = vertcat(mal(:).RegPropType);
Thank you very much.

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