Image Projection for oriented images

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Chandra Shekhar 2013-2-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/64199-image-projection-for-oriented-images

I have input image and expected image in below link..

https://www.dropbox.com/s/o26eeiiogtqmcj9/img.jpg

Please any one tell me how to achieve this projection and if input image having other type of orientation.

Thanks in advance.

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Chandra Shekhar 2013-2-20

编辑：Chandra Shekhar 2013-2-20

在 MATLAB Online 中打开

actually i tried like this

 I = imread('img.jpg');
 udata = [0 1];  
 vdata = [0 1];  % input coordinate system
 tform = maketform('projective',[ 0 0;  1  0;  1  1; 0 1],...
                                       [-4 2; -8 -3; -3 -5; 6 3]);
 [B,xdata,ydata] = imtransform(I,tform,'bicubic','udata',udata,...
                                                        'vdata',vdata,...
                                                        'size',size(I),...
                                                        'fill',128);
   imshow(I,'XData',udata,'YData',vdata), axis on
   figure, imshow(B,'XData',xdata,'YData',ydata), axis on

this gives reverse operation what i am expecting. but i don't know how to choose the rows of projective in 'maketform', in order to reconstruct original image back.

This is just example,for different image how to choose the projective row in 'maketform'.

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