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General / clarification on gradual selection parameters please
« on: October 08, 2012, 10:37:54 PM »
Hi there, I am looking for some guidance on the best use of the gradual selection properties to select and delete noisy points after the 'align photos' process with version 0.9.0.
Say, for example, that after I align photos, the chunk info shows the reprojection error to be 0.379438 with a max of 1.1552. What are the units on these values? Are these RMS errors? Is the first number the average?
Given those numbers, what's a statistically reasonable number to choose for selecting points in the gradual section dialog based on reprojection error? When the window pops up, the value in the level field is 0.681566. How was that value calculated?
Likewise, what are the units on the reconstruction uncertainty?
Sure, I can move those sliders around until I get a selection that 'looks right', but I am dealing with uneven terrain. I don't really know which points have been correctly located and which have not. It introduces user bias. I would be happier if there was a way to select, for example, only points that fall within a 95% confidence interval.
Thanks
Say, for example, that after I align photos, the chunk info shows the reprojection error to be 0.379438 with a max of 1.1552. What are the units on these values? Are these RMS errors? Is the first number the average?
Given those numbers, what's a statistically reasonable number to choose for selecting points in the gradual section dialog based on reprojection error? When the window pops up, the value in the level field is 0.681566. How was that value calculated?
Likewise, what are the units on the reconstruction uncertainty?
Sure, I can move those sliders around until I get a selection that 'looks right', but I am dealing with uneven terrain. I don't really know which points have been correctly located and which have not. It introduces user bias. I would be happier if there was a way to select, for example, only points that fall within a 95% confidence interval.
Thanks