how to specify the type of image registration and obtrain the transformation matrix?

I have two tiff images. One is "fixed" the other "moving". Because I know there are only two type of transformation involved in the moving image, i.e. a translation and a scale, I would like to;

1. First, register the two images by only translation and obtain the translation matrix .
2. Second, register the two image only by scaling and obtain the scale matrix.

The transformation matrix obtained has to be with a 6 significant figure precision.

So far, I have read the thread on imregister and imregtform and I'm getting nowhere.

I thank you in advance.

Shayan

[Ashish Uthama]

Where are you stuck with using IMREGISTER?