Hello everyone, I have a problem in using imcrop() function in matlab gui.

I am using imcrop() in matlab gui to crop the image

global Prev_img;
global Updatd_img;
global Crop_img;
Crop_img = Prev_img;
Prev_img=imcrop(Prev_img);
Updatd_img = Prev_img;
axes(handles.Cropaxis);
imshow(Updatd_img);

but it is giving error llke this:

Error using imcrop

Expected input number 1, I, RGB, or H, to be one of these types:

logical, int16, single, double, uint16, uint8

Error in imcrop>parseInputs (line 233)

validateattributes(a,{'logical','int16','single','double','uint16',...

Error in imcrop (line 93)

[x,y,a,cm,spatial_rect,h_image,placement_cancelled] = parseInputs(varargin{:});

Error in Home>Crop1_Callback (line 197)

Prev_img=imcrop(Prev_img);

Error in gui_mainfcn (line 95)

feval(varargin{:});

Error in Home (line 42)

gui_mainfcn(gui_State, varargin{:});

Error in

matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)Home('Crop1_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating UIControl Callback.

[Walter Roberson]

Just before the call to imcrop() put in a breakpoint, and show us

class(Prev_img)
size(Prev_img)

[Ahsan Malik]

K>> size(Prev_img)

ans =

1 34

K>> class(Prev_img)

ans =

'char'

[Walter Roberson]

You cannot imcrop() a file name. You need to read the image in and crop that.

[Rik]

Also, why are you using global variables? You can use the handles struct to shara data between callbacks.

[Ahsan Malik]

Thank you so much both of you....I'll try it.

[Ahsan Malik]

Thank you Sir Walter, it's working perfectly.

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F