Where can I find the computational complexity of the algorithms?

Hi, I wanted to know if there is a place where I can find the computational complexity (Big-O notation) of the algorithms implemented in opencv? In particular the methods used for [template matching](http://docs.opencv.org/3.0.0/df/dfb/group__imgproc__object.html#ga3a7850640f1fe1f58fe91a2d7583695d) and for shape trasformation using the class [ThinPlateSplineShapeTransformer](http://docs.opencv.org/3.0.0/dc/d18/classcv_1_1ThinPlateSplineShapeTransformer.html#details)