MATLAB: Barcode detection by webcam.

barcode

I'm using 2013a version and i have a project which uses webcam to read barcode. My functions are based on a demo of Matlab vision, how could i read and decode through webcam directly, not using "getsnapshot"? I'm sorry for my bad grammar. Here is my code:
obj = videoinput('winvideo', 2,'YUY2_640x480'); 
set(obj,'ReturnedColorSpace','rgb'); 
src_obj = getselectedsource(obj); 
get(src_obj); 
vidRes = get(obj, 'VideoResolution'); 
nBands = get(obj, 'NumberOfBands'); 
hImage = image( zeros(vidRes(2), vidRes(1), nBands) );  
FinalCode1=0;
while (1)
    ip_im = getsnapshot(obj);
    imshow(ip_im);
      %filter
      fi_im=imsharpen(ip_im);
      % Convert from RGB to Gray
      gray_im= rgb2gray(fi_im);
      %1
      %Threshold Image to black and white
      J = im2bw(gray_im, graythresh(gray_im));
      %Resize and process
      J=imresize(J,[240 320]);
      Row = [80 120 160]';
      [R,F] = Feature(J, Row);
      [Center, Width, Num] = Bar(F);
      [Sequence, Num] = Detection(Width, Num, 2);
      [LGCode, LCode, GCode, RCode, LCodeRev, GCodeRev, RCodeRev] = Codebook;
      [Code, Conf] = Recognition(Center, Width, Sequence, Num, LGCode, LCode, GCode, RCode, LCodeRev, GCodeRev, RCodeRev);
      %Validation
      OddSum= Code(1:1)+Code(3:3)+Code(5:5)+Code(7:7)+Code(9:9)+Code(11:11)+Code(13:13);
      EvenSum = Code(2:2)+Code(4:4)+Code(6:6)+Code(8:8)+Code(10:10)+Code(12:12);
      Checksums = OddSum + 3*EvenSum;
      Valid = and((not(mod(Checksums,10))),(Conf >= 0.7));
      FinalCode=uint64(0);
      for i = 1 :13
          FinalCode=FinalCode*10 + uint64(Code(i:i));
      end
      if and(Valid ,(FinalCode ~= FinalCode1))
          Code'
          sprintf('%013i',FinalCode)
          FinalCode1 = FinalCode';
      end
end

Best Answer

If you were using R2014a or later, instead of using getsnapshot() from the Image Acquisition Toolbox, you could use snapshot() from the USB Webcams support package.
The general purpose of getsnapshot() and snapshot() are the same: they obtain a single frame from the video feed so that the frame can be analyzed.
You can see snapshot() being used in this Computer Vision demo
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