MATLAB: Getframe produces greater image

axesbordergetframeImage Processing Toolbox

Hello,

I am using getframe() to read out axes that show an image. For example an 120×90 image. But the image I get from the getframe() function has a size of 121×91. There is a small white border. How can I turn that off? Btw I am showing the image without axis.

Best Answer

I do not understand your explanations. What is "the number of the current frame"? You cannot store a number "in a handle", because a handle is a kind of pointer to a HG object and created by Matlab. You mean a struct called "handle", but this is a confusing formulation. What do you think is stored in handle.frame_xy?

Again, please show us the code. It sounds like you forgot to store the modified handles struct. Then this might help:

function TheButtonCallback(hObject, EventData)
handles = guidata(hObject);  % Get handles struct from figure
handles.frame_xy = how ever you obtain it
guidata(hObject, handles);   % Store modified struct in the figure

Then the modified handles struct can be obtained by guidata again. If this is your problem, sharing data between callbacks is your main problem, and the extremely confusing decision of TMW to call the struct for storing figure related information "handles". Use the Search field of this forum and look form "share gui" to find many related threads: http://www.mathworks.com/matlabcentral/answers/?term=share+gui

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MATLAB: H i every one , i need to declare a counter such that if any one of the four buttons is pressed a specefic funtion specified in the fifth button is performed.Suppose UserData can not be used it reserved for something else

Use guidata, which calls setappdata and getappdata internally:

function pushbutton1_Callback(hObject, eventdata, handles)
handles = guidata(hObject);
handles.counter = 1;
guidata(hObject, handles);
% And the same for the other callbacks...
function pushbutton5_Callback(hObject, eventdata, handles)
handles = guidata(hObject);
switch handles.counter
  case 1
  case 2
  case 3
  case 4
  otherwise  % No SWITCH without OTHERWISE
    error('Programming error')
  end
end

MATLAB: Key press counter not updating

function counter_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
handles.counter = 0;  % Store the counter persistently in the handles struct
guidata(hObject, handles); 
end
% Get default command line output from handles structure
varargout{1} = handles.output;
% No, not here: counter =0;
end
function pushbutton1_Callback(hObject, ~, handles)
% No, do not reset the counter at each button press: counter=0;
handles = guidata(hObject);
% This is nonsense:
% if(counter>1)
%    disp(lallaala);
% end
handles.counter = handles.counter + 1;  % Access the variable inside the handles struct
guidata(hObject, handles);
% sum(length(counter));  ???
disp(handles.counter)
end

By the way: sum(length(counter)), counter is a scalar, then its length is 1 in every case. The sum of the length is 1 also.

Best Answer

Related Solutions

MATLAB: H i every one , i need to declare a counter such that if any one of the four buttons is pressed a specefic funtion specified in the fifth button is performed.Suppose UserData can not be used it reserved for something else

MATLAB: Key press counter not updating

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