Question

I need a c code for rotation of 2D image that includes the interpolations

Asked by: nasdarwish

I need a c code that rotates 2D image and includes interpolations

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Asked On
2008-04-23 at 12:24:39ID23347993
Topic

C Programming Language

Participating Experts
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Comments
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Answers

 

by: ozoPosted on 2008-04-23 at 12:28:58ID: 21424408

what interpolations?

 

by: nasdarwishPosted on 2008-04-23 at 12:35:00ID: 21424482

Isn't there some interpolations involved to get exact values of elements in the matrix after rotation?

 

by: ozoPosted on 2008-04-23 at 12:43:08ID: 21424555

Not if the elements of the matrix are exact.
If they are not exact, are you interpolating between different inexact matrices?  
How did you get these inexact matrices?  Did you round points to a grid?

 

by: ozoPosted on 2008-04-23 at 12:46:30ID: 21424585

Are your images represented as pixel maps?

 

by: nasdarwishPosted on 2008-04-23 at 12:47:56ID: 21424595

yes they are represented as pixel maps

 

by: ozoPosted on 2008-04-23 at 12:52:51ID: 21424651

Is this what you meant?

  HOW DO I ROTATE A RASTER IMAGE BY AN ARBITRARY ANGLE?
 
   The obvious but wrong method is to loop over the pixels in the source
   image, transform each coordinate, and copy the pixel to the
   destination. This is wrong because it leaves holes in the destination.
   Instead, loop over the pixels in the destination image, apply the
   *reverse* transformation to the coordinates, and copy that pixel from
   the source. This method is quite general, and can be used for any
   one-to-one 2-D mapping, not just rotation. You can add anti-aliasing
   by doing sub-pixel sampling.
   
   However, there is a much faster method, with antialising included,
   which involves doing three shear operations. The method was originally
   created for the IM Raster Toolkit; an implementation is also present
   in PBMPLUS. Reference: A Fast Algorithm for Raster Rotation", by Alan
   Paeth (awpaeth@watcgl.waterloo.edu) Graphics Interface '86
   (Vancouver). An article on the IM Raster Toolkit appears in the same
   journal. An updated version of the rotation paper appears in "Graphics
   Gems" under the original title.
   
   

 

by: nasdarwishPosted on 2008-04-23 at 12:55:06ID: 21424673

they are image matrices and I need to be able to rotate the image

 

by: ozoPosted on 2008-04-23 at 12:57:08ID: 21424686

 

by: nasdarwishPosted on 2008-04-23 at 12:58:17ID: 21424700

is there a sample code?

 

by: ozoPosted on 2008-04-23 at 13:02:07ID: 21424740

Sorry, I thought you were asking question 1.01 from
http://www.faqs.org/faqs/graphics/algorithms-faq/
for all points in the image
I now think you are asking question 3.01

 

by: nasdarwishPosted on 2008-04-23 at 13:02:17ID: 21424744

is there a code for arbitrary angle rotation?

 

by: nasdarwishPosted on 2008-04-23 at 13:19:04ID: 21424911

this helps but is there a code that I can use?

 

by: ozoPosted on 2008-04-23 at 13:24:22ID: 21424957

The Paeth article no longer seems to be available on line,
you can get the Graphics Gems book, or there's a rotate.c in
http://www.leptonica.com/source/leptonlib-1.55.tar.gz

20120131-EE-VQP-002

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