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#X text 185 97 generates source coordinates to find homography;
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#X text 485 9 pix_opencv_wapperspective finds the transformation matrix
between srcMatrix and dstMatrix;
#X text 485 38 it sends through its second outlet the 3x3 transformation
matrix when a correct scrMatrix message is received;
#X text 484 65 you should first initiliaze dstMatrix;
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#X text 482 86 it also applied the tansformation matrix on incomming
image stream;
#X text 482 151 pix_opencv_findchessboardcorners finds chessboard corners
in the incomming image stream and send out corners coordinates as a
list trought its second outlet;
#X text 484 200 it also prints found corners on the image stream;
#X msg 409 423 mapMatrix 1 0 0 0 1 0 0 0 1;
#X text 408 404 you can also set the map matrix directly;
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#X text 614 422 identity;
#X text 635 444 scale by 0.5;
#X msg 409 463 mapMatrix 0 1 0 1 0 0 0 0 2;
#X text 608 465 rotation by 90deg and scale by 0.5;
#X text 156 134 switch to find corners and mapMatrix and switch back
to apply it;
#X text 186 211 number of inner corners in each direction;
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#X text 46 22 wrap_persective can be easilly computed by the GPU in
order to boost performace;
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#X text 306 137 switch CPU / GPU;
#X text 454 256 Since the matrice is computed for somthing that range
from 0 to 639 in X \, and from 0 to 479 in Y \, one have to convert
(scale / translate) the primitive coordinate to fit the transformation
matrix.;
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