comp.lang.idl-pvwave archive: archive » POLY

Home » Public Forums » archive » POLY_2D proken. Film at 11.

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: poly_2d [message #24490 is a reply to message #12626]

Wed, 04 April 2001 06:11

davidf
Messages: 2866
Registered: September 1996

Senior Member

pfis@mytec.com (pfis@mytec.com) writes:

> I am using poly_2d to warp an image. I am using 3 parameters for each
> coordinate (e.g. xnew=a+bx+cy and similar for ynew). My problem is I am
> having trouble choosing 'a' such that the center of the image (actually pixel
> [64,64] of a 128x128 image) does not move. Using a=fix(-64.*(b+c-1.)) keeps
> the center stationary to about 1 pixel which is not good enough. I wrote my
> own version of the warping program which does what I want but is slower than
> poly_2d. Any help would be appreciated.

I'm wondering if ROUNDing the final result wouldn't
give you better results. (Or CEILing, FLOORing, etc.)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

Report message to a moderator

[Message index]

		POLY_2D proken. Film at 11. By: Craig DeForest on Fri, 21 August 1998 00:00
		Re: poly_2d By: davidf on Wed, 04 April 2001 06:11

Previous Topic:	Re: dlm creating an array?
Next Topic:	Rotate an image using objects

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Nov 28 10:07:19 PST 2025

Total time taken to generate the page: 1.92967 seconds