Image Acquisition using a GUI

Question

Lu Yaseen 2014-4-27

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/127417-image-acquisition-using-a-gui

回答： Lu Yaseen 2014-4-28

Hi guys im having a problem acquiring an image using the GUI , so once i click the button i should be able to get a photo from a the live video in the GUI here is my code

if true
  % --- Executes on button press in pbCapture.
function pbCapture_Callback(hObject, eventdata, handles)
vid = videoinput('kinect', 2);
vid.ROIPosition = [89 81 137 140];
vid.FramesPerTrigger = 1;
triggerconfig(vid, 'manual');
vidRes = get(vid, 'VideoResolution');
imWidth = vidRes(1);
imHeight = vidRes(2);
nBands = get(vid, 'NumberOfBands');
hImage = image(zeros(imHeight, imWidth, nBands), 'parent', handles.axPreview)
preview(vid, hImage);
start(vid); 
pause(5); 
trigger(vid);
stoppreview(vid);
capt1 = getdata(vid);
[FileName, PathName] = uiputfile('*.jpg', 'Save As'); 
Name = fullfile(PathName,FileName);
imwrite(capt1, Name, 'jpg');
end

i can save the image in PNG but i cant save it in JPEG i get this error

Error using writejpg>set_jpeg_props (line 184) UINT16 image data requires bitdepth specifically set to either 12 or 16.

Error in writejpg (line 50) props = set_jpeg_props(data,varargin{:});

Error in imwrite (line 473) feval(fmt_s.write, data, map, filename, paramPairs{:});

Error in samples_aquasition>pbCapture_Callback (line 100) imwrite(capt1, Name, 'jpg');

Error in gui_mainfcn (line 96) feval(varargin{:});

Error in samples_aquasition (line 42) gui_mainfcn(gui_State, varargin{:});

Error in@(hObject,eventdata)samples_aquasition('pbCapture_Callback',hObject,eventdata,guidata(hObject)) Error while evaluating uicontrol Callback

i really need to save the file in JPEG , and i dont want to read the image again and convert it to JPEG after saving it as PNG. thanks

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Answer 1

Lu Yaseen 2014-4-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/127417-image-acquisition-using-a-gui#answer_134834

在 MATLAB Online 中打开

Thank you image Analyst for the fast replay but i think that i found the solution to my problem :)!

instead of using

capt1 = getdata(vid);

i used

capt1 = getdata(vid,1,'uint8');

because getdata(vid) will get the data as uint 16 by default and jpg works with uint8 so we have to specify that

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Answer 2

Image Analyst 2014-4-28

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/127417-image-acquisition-using-a-gui#answer_134819

If you're only capturing 1 frame per trigger, then just try using getsnapshot() instead of getdata(). And don't put the file type into imwrite(). Let it figure it out itself from the filename you supply it. Let me know how that works.