Move pixel coordinate

imagetransformation

asked 2017-05-25 04:32:35 -0600

Kenny Karnama
106 ●3 ●7

Hi guys, i want to implement this formula :

formula

can anyone suggest function in opencv to do this ?

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Comments

remapping

berak ( 2017-05-25 04:46:29 -0600 )edit

sorry, the link can't be acessed.

Kenny Karnama ( 2017-05-25 05:08:56 -0600 )edit

^^ thanks for notice, fixed now !

berak ( 2017-05-25 05:13:11 -0600 )edit

can i do shear transformation on x axis using remapping ? because i have used warpaffine, and it gives me wrong result.

Kenny Karnama ( 2017-05-25 05:15:12 -0600 )edit

you can do any transformation with it (that's the beauty), you're not restricted to an affine or perspective conserving formula.

berak ( 2017-05-25 05:19:24 -0600 )edit

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answered 2017-05-25 05:27:24 -0600

berak
32993 ●7 ●81 ●312

updated 2017-05-25 05:29:34 -0600

you can use remap for your shearing transformation:

const float a = 0.27; // it's a constant ?
Mat img = imread("../img/grid.jpg");
Mat_<Vec2f> prjMap(img.size());
for (int x=0; x<img.cols; x++) {
    for (int y=0; y<img.rows; y++) {
        float u = x - y * tan(a);
        float v = y;
        prjMap(y, x) = Vec2f(u,v);
    }
}
Mat projected;
remap(img, projected, prjMap, cv::Mat(), INTER_LINEAR);

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