Griffin wrote:
OT: If I use Panotools, what parameters do you use for debarelization? Is the parameter "once and for all"?
TIA.
Griffin.
Yes the paramater is "fixed" for each format, but it differs with the format -- ie; a 10D will be less than a 1Ds. My 1Ds uses 141.5 degrees horizontal FOV. I just did a quick and dirty on Joe's horse and it appears to require about 91 degrees horizontal FOV correction. You may need to play around with that figure slightly to get your constant dialed in exactly, as it appeqars 91 was not quite enough (the horizon is still slightly bowed). Also, a vertical format image will require a different setting form a horizontal format image, so I recommend you do all of your conversions in the same orientation, and rotate the image after conversion for ease of use.
Cheers,
Edited by Jack Flesher on Jul 27, 2003 at 05:02 PM GMT
NOTE: You can now easily tell by the "keystoning" of the telephone pole that Joe was aiming his camera down to take this image. This can also be corrected in PT or PS, but you will lose a bit of the image due to crop constraints.
Jack Flesher wrote:
Yes the paramater is "fixed" for each format, but it differs with the format -- ie; a 10D will be less than a 1Ds. My 1Ds uses 141.5 degrees horizontal FOV. I just did a quick and dirty on Joe's horse and it appears to require about 91 degrees horizontal FOV correction. You may need to play around with that figure slightly to get your constant dialed in exactly, as it appeqars 91 was not quite enough (the horizon is still slightly bowed). Also, a vertical format image will require a different setting form a horizontal format image, so I recommend you do all of your conversions in the same orientation, and rotate the image after conversion for ease of use. ...Show more →
Jack,
Thank you for your kind help.
I have read your post from the archive with detailed parameters. Just when I drop them down, I realize they are for 1D/1Ds but not D30/D60/10D!
Anyway, will try your recommendations. I use a 16mm fish but I get the idea to start with. May be you should save me US$39.95 for a Debarrelizer!
Update: still no luck with the parameters. I tried using both 90 on "image" and "panomia" but the edge is less "useful" than the one generated by Debarrelizer.
Griffin wrote:
Update: still no luck with the parameters. I tried using both 90 on "image" and "panomia" but the edge is less "useful" than the one generated by Debarrelizer.
Any hints and help is appreciated.
Griffin.
Post a 700 pixel full frame image here and I'll correct it and give you the settings.
Here is a quick and dirty correction using filter/panorama tools/remap. Set the input image to fullframe fisheye and the output to rectilinear, and set both HFOV at 82.5. This is what you'll get (You can see you were both pointing the camera down (pitch) and swinging the camera laterally (yaw) which can be corrected in PS or PT later:
Now that I determined 82.5 seems to be the proper setting for your lens on your camera (or at least close enough for you to fine tune it) I am ready to correct with the filter/panotools/ADJUST menu. Here you get into the "set" menu and do the following. Set input as full frame fisheye at 82.5 HFOV and image size at the actual image size. Leave roll, pitch and yaw at 0 for now. Set the output to the same settings but set to "rectilinear" and set HFOV to something about 10% larger than your input HFOV, like 90. This is so you can see the entire "corrected" image. Click go and it will look like this:
Edited by Jack Flesher on Jul 29, 2003 at 07:35 AM GMT
Now you can selectively crop to a normal 3:2 ratio, but note that you end up with a slightly wider image, as well as getting a cleaner image overall than when using "remap" -- but it requires more work. You can now go back and play with pitch and yaw angles to correct he perspectives you have in the image. After crop but before pitch or yaw correction:
Edited by Jack Flesher on Jul 29, 2003 at 07:36 AM GMT
And lastly, here is a quick shot at correcting the pitch and yaw. It's not perfect, but close enough for the example without spending gobs of time on it You also now can see a tad of roll (about 0.25 degree cw), which went unnoticed until I did the pitch and yaw correction. I did this in PS on the scalloped image, then cropped to 3:2:
May be you should save me US$39.95 for a Debarrelizer!
I tried using both 90 on "image" and "panomia" but the edge is less "useful" than the one generated by Debarrelizer.