mardi 21 avril 2015

How to get transformation matrix using old transformation matrics and co-ordinates?

Hello friends can any one clear me about what is w' in basic matrix operation formula in Qtransform below is code and what is difference between perspective and affine transform. Actually I am trying to find the at what values Img3 gets transformed?

x' = m11*x + m21*y + dx
y' = m22*y + m12*x + dy
if (is not affine) 
     w' = m13*x + m23*y + m33
     x' /= w'
     y' /= w'


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