Geometric Transform Estimator, stuck in endless loop!

Hi

Some inputs to the Geometric Transform Estimator leads to it getting stuck in an endless loop which cannot be interrupted by Ctrl+c.

Any ideas why? I don't know how to debug that error because GTE seams to be unreachable through Matlab's debugger.

There are plenty enough points for GTE and I cannot see any difference between the input values of when it works and when it gets stuck.

[Tobias Pahlberg]

Could it happen because of there being a few duplicate matches in the input. And that RANSAC fails if it picks two points that have the same coordinates in one image, and different coordinates in the other?

Here is the input that fails: (M =[x0,y0,x1,y1])

M =

209 3179 66 3067

258 3506 98 2324

258 3506 66 2532

116 589 76 4342

282 3754 48 4217

220 3504 100 4478

191 2425 14 2882

174 2182 14 2882

249 3752 83 2320

249 3752 14 1698

249 3752 66 3067

258 3339 14 2818

258 3339 48 4217

87 1267 118 1695

193 2680 118 1695

87 564 14 2882

151 2056 19 144

151 2056 102 1439

263 2954 66 2532

222 3185 102 1439

74 910 19 3222

217 3518 28 2499

179 2199 24 3238

148 956 28 2499

301 4456 20 2947

285 3166 28 2499

[Walter Roberson]

(No obvious reason to close this Question; it could use some cleanup though.)

Answer 1

[Tobias Pahlberg]

Thanks Huibao for the updated files to Computer Vision System Toolbox you sent me. I've been running tests for a few days now and everything works fine.

Answer 2

[Huibao]

Hi Tobias,

Could you give me more information so I can debug this problem?

1. What was the version of your MATLAB and Computer Vision System Toolbox?

2. What kind of machine you are using? 32 bits or 64 bits?

3. Are you using Windows or Linux?

4. What was the other settings of the gte object?

5. If you could attach the scripts for reproducing this problem, that will be valuable, too.

Thanks,

Huibao

Answer 3

[Huibao]

Hi Tobias,

Thanks for the data. I'm looking into the problem and will let you know once I figure it out.

Huibao

Answer 4

[Huibao]

Please see Bug Report No. 805835 for the fix.

<http://www.mathworks.com/support/bugreports/search_results?search_executed=1&keyword=&release_filter=Exists+in&release=220&selected_products=6341&commit=Search>

Huibao

[Tobias Pahlberg]

Thanks, these files work for 2012a. The ones I got earlier didn't.