Talk:Image distortion
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[edit] Merge proposal
It would be really nice to have an article image distortion to link to, but since we have barrel and pincushion in separate articles it would require yet one more for the general case. These are both tiny and would fit better as sections of a generic image distortion article. Please support or oppose the merge, with reasons. Dicklyon 23:12, 7 February 2007 (UTC)
- support, of course, since I suggested it, as explained above. Dicklyon 23:12, 7 February 2007 (UTC)
- Support. Sounds like a good idea. Don't forget to adjust Aberration in optical systems accordingly. Is the best title Image distortion, or Distortion (optics)?--Srleffler 01:25, 8 February 2007 (UTC)
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- As written, it includes CRT distortion, which is image but not exactly optics. But I'm flexible. Dicklyon 01:39, 8 February 2007 (UTC)
- Well, it is electron optics, but I agree that your proposed name makes more sense.--Srleffler 05:09, 8 February 2007 (UTC)
- As written, it includes CRT distortion, which is image but not exactly optics. But I'm flexible. Dicklyon 01:39, 8 February 2007 (UTC)
[edit] Vignetting
Would I be right to guess that vignetting is related to image distortion? That is, if a region of the image is stretched, the same light is falling on more area and so would appear darker. —Ben FrantzDale 04:09, 4 November 2007 (UTC)
- While it seems reasonable that distortion would lead to a slight darkening or lightening at the edges of the image, this is not one of the dominant causes of vignetting. There are several types of vignetting. The dominant one in optical design comes from off-axis rays of light hitting obstructions inside the camera (or the edges of the individual lens elements). While modern optical design software makes it easy to see when and where vignetting will occur, this was not so easy to predict with traditional lens design methods.--Srleffler 05:14, 4 November 2007 (UTC)
[edit] Details
This article needs details about the causes of distortion in optical systems. For example, I've seen a textbook explanation of how an aperture can cause barrel and pincushion distortion. —Ben FrantzDale 00:36, 13 November 2007 (UTC)
[edit] Barrel distortion
You say that the distortion from a fish eye lens is due to it imaging a hemispherical scene. I find this a bit confusing. Surely the barrel distortion is due to the lens, not the properties of the scene being imaged or of perspective projection. E.G. If you took an image of a very large flat plane with squares on it using a pin hole camera the image you get would have straight lines. So no barrel distortion would be present due to the pin hole "lens". Only perspective "distortion" creating the foreshortening of the squares seen further away at the side of the image (making the lines appear closer together as they get further away from the centre of the image). An image of the same scene with a fish eye lens would cause barrel distortion due to the lens itself not the geometry of the scene. --Lrussell1 (talk) 15:49, 26 November 2007 (UTC)
