Comments on: Spatial transformations: Handling noninvertible cases

By: Steve

Steve — Thu, 31 Aug 2006 11:59:47 +0000

Jens - I’m sorry, I thought you were asking how to verify that findbounds worked.

By: Jens Michaelis

Jens Michaelis — Thu, 31 Aug 2006 09:24:09 +0000

It is correct that you can’t, however the workaround is fairly easy, just plug the result in and use tforminv:

TFORM = cp2tform(input_points, destination_points,’polynomial’,3); % this should make the transform
predicted_destinations = tforminv(TFORM,destination_points); % check how it worked
map_residuals = input_points - predicted_destinations

By: Steve

Steve — Tue, 22 Aug 2006 11:13:16 +0000

Jens - you can’t!

By: Jens Michaelis

Jens Michaelis — Tue, 22 Aug 2006 09:29:17 +0000

Thanks for the example. I have a question though:

if there is no forward function defined, how can one use the tformfwd command to find out how the process worked?

thanks for the help,

jens