[ptx] More questions on autopano-sift

[alexandre jenny]

Let's respond to that ... Even I'm not sebastian.

Yes, you're right, there's no key pairs verification systems like a ransac
or hough transform.
In my own version of autopano, I used a ransac approach to get rid of the
false pair of points
founded beetween 2 pictures. After that you can use the same statistical
approach as brown
to see if there is a probability of more than 97% match by using ni > 5.9f *
0.22*nf, (ni, ransac
inlers, and nf ransac outlers). So you have criterion to check if pictures
matches.
The next stage is to regroup by panorama and have a small Levenberg
Marquardt algorithm to
recalculate yaw, pitch, roll to get a really good estimation of picture's
position.

My source of inspiration were the ltilib, if you want to look into
algorithms.

I will release my full version of autopano soon.

Bye
   Alexandre

> -----Message d'origine-----
> De : ptx-bounces at email-lists.org 
> [mailto:ptx-bounces at email-lists.org] De la part de Xianyong Fang
> Envoyé : mercredi 3 mars 2004 14:03
> À : Sebastian Nowozin; ptx at email-lists.org
> Objet : [ptx] More questions on autopano-sift
> 
> 
> Hi Sebastian,
>  
>   Thank you very much for your autopano-sift package. After 
> analysis it, I finally understand the ideas in Lowe's paper. 
> 
>   Still I have some more questions. It seems to me that your 
> package just treat all the images that can fully stitched 
> into one panorama or wide angle image. In your package, you 
> don't consider how to remove false image matches as Brown's 
> paper discussed.In Brown's paper, he used a probabilistic 
> model to verify the homography recovered by ransac method. 
> But in your implementation, after getting the matched match 
> feature pairs, you just send the result into hugin without 
> image match verification. Am I right? If I am right, do you 
> know any existing implementation that can realize homography 
> verification? I am lazy,and don't want to code it even,*_*  
> 
>   Thank you very much in advance.	
> 
> Xianyong
> 
> 
>