mirror image and shear image transformation

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Maruthi Maruthi 2017-12-4

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https://ww2.mathworks.cn/matlabcentral/answers/370851-mirror-image-and-shear-image-transformation

评论： Maruthi Maruthi 2017-12-6

Sir, In my project, original image is transformed in to mirror image and shear image transformation. After transformation, I need to know which parameters help to simulate these three normal image, mirror image and shear image transformation. If normal image displayed, I need to know this is original image. If it is mirror image displayed, i need to guess it is mirror image, which parameters tells us that it is mirror image or shear image or original image similarly for shear image. Please, help me sir, I need to know the difference and identification of these three types of images. Please help me..

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Answer 1

Image Analyst 2017-12-4

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https://ww2.mathworks.cn/matlabcentral/answers/370851-mirror-image-and-shear-image-transformation#answer_294583

在 MATLAB Online 中打开

fliplr() might be useful.

if isequal(originalImage, fliplr(testImage))
    % It's a mirror image
end

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Maruthi Maruthi 2017-12-5

在 MATLAB Online 中打开

Sir, Thanks for your earlier response. In the above code fliplr used twice. So the image returns in the same form then if block is executed. Suppose, there are six images in the grid, each image is transformed either mirror or shear image transformation or original image displayed in the grid. How would I know which images is which kind of transform. Please help me.

function corr_verif()
mm = floor(1000+(rand()*8999))
trainingData=imageSet('D:\MATLAB\R2017a\bin\im2','recursive')
minSetCount=min([trainingData.Count])
  I=trainingData(randi(numel(trainingData)));
  helperDisplayImageMontage(I.ImageLocation(1:end))
count=1;
  while count<=1
    [x,y]=ginput(1)
    count=count+1;
end
    x=round(x);
    y=round(y);
            if(x<200)
            if(y<200)
              helperDisplayImageMontage(I.ImageLocation(1));
              a=read(I,1);
              a1=fliplr(a);
              imshow(a1);
             corr1=corr2(rgb2gray(a),rgb2gray(a1))
                  if(corr1>0.7)
                 disp('mirror');
             else
                 if(corr1<0)
                     disp('shift');
                 else
                    disp('normal');
                 end
                  end
              else
                  if((200<y)&(y<400))
                        helperDisplayImageMontage(I.ImageLocation(4))%teddy
                        a=read(I,4);
              a1=fliplr(a);
             corr1=corr2(rgb2gray(a),rgb2gray(a1))
                  if(corr1>0.7)
                              disp('mirror');
             else
                 if(corr1<0)
                  disp('shift');
                 else
                     disp('normal');
                 end
                  end
                  end
              end
          else
                  if((200<x)&(x<400) &(y<200))
                      helperDisplayImageMontage(I.ImageLocation(2)) %cofe
                      a=read(I,2);
                          a1=fliplr(a);
             corr1=corr2(rgb2gray(a),rgb2gray(a1))
                  if(corr1>0.9)
                 disp('mirror');
             else
                 if(corr1<0)
     disp('shift');
                 else
                   disp('normal');
                 end
                  end
                  else
                      if((x>400)&(x<600)&(y<200))
      helperDisplayImageMontage(I.ImageLocation(3))    
      a=read(I,3);
              a1=fliplr(a);
             corr1=corr2(rgb2gray(a),rgb2gray(a1));
                  if(corr1>0.7)
                 disp('mirror');
             else
                 if(corr1<0)
      disp('shift');
                 else
                     disp('normal');;
                 end
                  end
      %book
      %net1(a,b,c,d);
                      else
              if((200<x)&(x<400) &(200<y) &(x<400))
              helperDisplayImageMontage(I.ImageLocation(5))
              a=read(I,5);
                          a1=fliplr(a);
             corr1=corr2(rgb2gray(a),rgb2gray(a1))
                  if(corr1>0.9)
                   disp('mirror');
             else
                 if(corr1<0)
                 disp('shift');
                 else
                     disp('normal');
                 end
                  end
              else
                  helperDisplayImageMontage(I.ImageLocation(6)) 
                  a=read(I,6);
             a1=fliplr(a);
             corr1=corr2(rgb2gray(a),rgb2gray(a1))
                  if(corr1>0.7)
                       disp('mirror');
             else
                 if(corr1<0.7)
               disp('shift');
                 else
                     disp('normal');
                 end
                  end
end
               end
end

Image Analyst 2017-12-5

Take each test image and test it against both the original and the flipped version of the original. It will match either one of those, or if even one pixel is off it may not match either of them, especially if the number of rows or columns or color channels is not the same.

See this link for help in debugging your code if you don't understand what your code is doing.

Maruthi Maruthi 2017-12-6

Thank you sir.

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