Calculates a perspective transform from four pairs of the corresponding points

T = cv.getPerspectiveTransform(src, dst)

Input

• src Coordinates of quadrangle vertices in the source image. A numeric 4-by-2 row vectors or a cell-array of 2-element vectors of length 4 {[x,y], [x,y], [x,y], [x,y]}
• dst Coordinates of the corresponding quadrangle vertices in the destination image. Same type and size as src.

Output

• T 3-by-3 perspective transformation matrix

The function calculates the 3x3 matrix of a perspective transform so that:

t_i * [X_i; Y_i; 1] = T * [x_i; y_i; 1]

where:

dst(i,:) = [X_i, Y_i], src(i,:) = [x_i, y_i]  for i=1,2,3