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#1
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Camera correcting lens distortions?
Hi group,
Is there a camera that electronically corrects geometrical lens distortions (esp. Barrel)? For the fixed-lens digital cameras out there this should be not hard to implement. It also would manufacturers allow to use cheaper/lighter glass on their consumer products and still get decent image quality. On a similar note, does anybody know a decent lens-distortion correction software for Linux? It should be able to work on many images automatically, without manual intervention. Thanks, Matthias |
#2
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Camera correcting lens distortions?
On 06 Jul 2004 11:50:08 +0200, Matthias Heiler
wrote: Is there a camera that electronically corrects geometrical lens distortions (esp. Barrel)? For the fixed-lens digital cameras out there this should be not hard to implement. It also would manufacturers allow to use cheaper/lighter glass on their consumer products and still get decent image quality. Matthias, I don't have an answer to your question. Only wanted to remark that any recalculation that involves pixel relocation will necessarily reduce sharpness. I guess that this is one of the reasons why nobody may be doing it in the camera. There's most likely some software though. Hans-Georg -- No mail, please. |
#3
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Camera correcting lens distortions?
Matthias Heiler writes:
Is there a camera that electronically corrects geometrical lens distortions (esp. Barrel)? No. It's very difficult because distortions vary with the lens, the focal length setting (for zooms), the aperture setting, and even the current focus setting. A camera would have to have all this information internally recorded for all lenses in order to correct anything. Additionally, some types of lens defects cannot be corrected after the fact (such as blurriness). It also would manufacturers allow to use cheaper/lighter glass on their consumer products and still get decent image quality. They are already using very cheap glass in most cases. -- Transpose hotmail and mxsmanic in my e-mail address to reach me directly. |
#4
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Camera correcting lens distortions?
I am certain that a software product exists for correcting Barrel distortion
in wide-angle lenses. Sorry I cannot tell you its name! Perhaps Google can remember better than I can. It may be a Photoshop plug-in. ~Ray "Matthias Heiler" wrote in message ... Hi group, Is there a camera that electronically corrects geometrical lens distortions (esp. Barrel)? For the fixed-lens digital cameras out there this should be not hard to implement. It also would manufacturers allow to use cheaper/lighter glass on their consumer products and still get decent image quality. On a similar note, does anybody know a decent lens-distortion correction software for Linux? It should be able to work on many images automatically, without manual intervention. Thanks, Matthias |
#6
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Camera correcting lens distortions?
"Ray Paseur" wrote in message
... I am certain that a software product exists for correcting Barrel distortion in wide-angle lenses. Sorry I cannot tell you its name! Perhaps Google can remember better than I can. It may be a Photoshop plug-in. ~Ray This sort of distortion correction is built into both Paint Shop Pro and Pano Tools. Of necessity, there is a sharpness reduction. Whether correction would be better done _before_ the Bayer interpolation or after is something I would like to know. It amuses me that so much effort is put into hardware when to do the same in software is relatively simple coding, and it would not need to be restricted to fixed-focal length cameras either - a different degree of correction for each zoom. However, it is a slow process, and the limited CPU power in digital cameras may be hindering implementation. Cheers, David |
#7
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Camera correcting lens distortions?
"David J Taylor" writes:
It amuses me that so much effort is put into hardware when to do the same in software is relatively simple coding, and it would not need to be restricted to fixed-focal length cameras either - a different degree of correction for each zoom. However, it is a slow process, and the limited CPU power in digital cameras may be hindering implementation. I'm thinking along the same line. In the best of all worlds cameras with built-in lens (zoom or prime) would be calibrated by the manufacturer to correct most distortions automatically. SLRs would offer a calibration mode where the user takes some images of a reference object (e.g., a poster provided by the manufacturer) and the camera measures the distortion of a given lens. Of course, the correction could be disabled by the user at any time to allow for maximum sharpness (alternatively one can throw in a couple of extra megapixels for that). I understand the CPU argument: Doing the interpolations correctly would probably require much floating point processing power. But it's just a matter of time until we have that. I wonder if any manufacturers are reading this forum... ;-) |
#8
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Camera correcting lens distortions?
"Matthias Heiler" wrote in message
... [] I'm thinking along the same line. In the best of all worlds cameras with built-in lens (zoom or prime) would be calibrated by the manufacturer to correct most distortions automatically. ... and external lenses could simply provide the required parameters to the camera's CPU just like they do for other data today. I don't think there's a need to restrict this to built-in lenses, is there? SLRs would offer a calibration mode where the user takes some images of a reference object (e.g., a poster provided by the manufacturer) and the camera measures the distortion of a given lens. Of course, the correction could be disabled by the user at any time to allow for maximum sharpness (alternatively one can throw in a couple of extra megapixels for that). Nice one! I understand the CPU argument: Doing the interpolations correctly would probably require much floating point processing power. But it's just a matter of time until we have that. ... and perhaps sooner than we expect! I wonder if any manufacturers are reading this forum... ;-) ... I should have patented this idea - although I expect someone already has. Cheers, David |
#9
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Camera correcting lens distortions?
On Tue, 06 Jul 2004 12:59:24 GMT, David J Taylor wrote:
.. and external lenses could simply provide the required parameters to the camera's CPU just like they do for other data today. I don't think there's a need to restrict this to built-in lenses, is there? .. I should have patented this idea - although I expect someone already has. Olympus. 4/3 system has provision to do this, don't know if the E-1 currently does though. -- John Bean Electricity is actually made up of extremely tiny particles called electrons, that you cannot see with the naked eye unless you have been drinking (Dave Barry) |
#10
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Camera correcting lens distortions?
On Tue, 06 Jul 2004 13:14:09 +0200, Mxsmanic
wrote: No. It's very difficult because distortions vary with the lens, the focal length setting (for zooms), the aperture setting, and even the current focus setting. A camera would have to have all this information internally recorded for all lenses in order to correct anything. Additionally, some types of lens defects cannot be corrected after the fact (such as blurriness). Actually I find the thought fascinating. Who knows, perhaps in a couple of years we will have cheap cameras with a fixed, cheap lens and a nonhomogeneous sensor field (higher pixel density in the center). The camera will take a rather raw image, and all the fine work, zooming, all kinds of corrections, will be done by the built-in computer. One way to increase picture quality could be to take several photos in quick succession, then process the whole series, concentrate on the one that is least blurred, take details of moving objects from other shots in the sequence, etc. Hans-Georg -- No mail, please. |
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