Estimate Homography to do 2D to 3D integration (4)

I. MATLAB Function of Homography: 
 
     1. The following method is for mapping one area to another. The transform matrix only maintains the relationship of each corresponding set (i.e., a set of fixed points) of images for transforming each point from one Image to another. Every pair of set holds its own matrix of affine transformation.

     - maketform: http://www.mathworks.co.uk/help/images/ref/maketform.html
     - tformfwd: http://www.mathworks.co.uk/help/images/ref/tformfwd.html
     - tforminv: http://www.mathworks.co.uk/help/images/ref/tforminv.html

     2. This is an alternative way to maintain the homography of the entire image. Each point within the pair of images can based on on matrix to do affine transformation

         - fitgeotrans: http://www.mathworks.co.uk/help/images/ref/fitgeotrans.html#btxcsco-2
         - transformPointsForward: forward affine transformation
           transformPointsInverse: Inverse affine transformation
         - fixed points: points of markers
           moving points: points located on an object

II.