Hi,
I just tried the (freshly compiled) calibrate_lens program on the
photograph provided by the download link in my last e-mail on this subject.
I had to use the option "m 0.1", i.e. had to allow very short lines, as
the horizontal / vertical edges of the "tiles" (which are actually
aluminium panels, I guess) were not identified as continuing lines.
The ouput (as dumped below) is, however, cryptic. As far as I can see,
there is no documentation whatsoever for calibrate_lens (?).
Others seem to have the same problems with interpretating the program's
results:
http://groups.google.com/group/hugin-ptx/browse_thread/thread/f5afc98072ef1046
Can anybody help?
In principle, I doubt that one should rely on automatic processing when
determining such crucial parameters. It's probably better to invest some
human, i.e. intelligent, preprocessing.
Wolfgang Hugemann
Lens calibration tool
Version 2009.4.0.4742 built by Allard
Processing image 92.jpg
Rectilinear lens
Crop factor: 3.72988
Pixel density (pixels/mm): 212.603
Focal length (mm): 9.2
Focal length (pixels): 1955.95
Scaling by: 0.934579
New dimensions: 1600 x 1279
Minimum line length: 160
Detecting edges...
Writing 92_edges_threshold_4_scale_2.jpg
edgeMap2linePts(saveimages 1): 4598 segments
linePts2lineList(lmin 160 flpix 1955.95)
debug plot dbg_goodlines.jpg 98 lines
debug plot dbg_badlen.jpg 8 lines
debug plot dbg_badori.jpg 9 lines
98 lines
98 lines found
Found 98 lines.
Writing lines to file 92.lines
Camera digicam h 1712 (212.6/mm) v 1368 (212.6/mm)
Lens rectilinear FL 9.2 mm (1955.9 pixels)
Iter: 0, estimate: 0 -- errors 0.0714154252 0.0040568361
Iter: 10, estimate: -0.016153382 -- errors 6.84589016e-005 0.00291043389
Iter: 20, estimate: -0.0161681211 -- errors 4.9119504e-006 0.00291043282
Iter: 30, estimate: -0.016169096 -- errors 9.89986448e-009 0.00291043282
Iter: 40, estimate: -0.0161690958 -- errors 5.04799143e-008 0.00291043282
Iter: 50, estimate: -0.0161690958 -- errors 2.35416946e-006 0.00291043282
Levenberg-Marquardt returned in 51 iterations
reason 2 - stopped by small Dp
start ||e||_2 : 0.00405684
final ||e||_2 : 0.00291043
||J^T e||_inf : 2.35417e-006
||Dp||_2 : 1.78437e-038
mu/max[J^T...]: 1.24997e+013
iterations : 51
stop reason : 2
function evals: 58
Fitted parameters...
Radial mean sq. dev. 0.0019 factors:
0.0000 0.0000 0.0000 -0.0051 0.0000 0.0000 0.0000
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