![]() ![]() Using the Angular Field of View Calculator, published by Max Lyons, the horizontal and vertical field of view for several focal lengths are listed in the following table. This photograph was processed with PTGui to form a rectilinear image. The following image illustrates the distortion produced by this lens. For purposes of illustration I will be using a ♔/3 camera equipped with a Samyang 7.5mm fisheye lens. For purposes of this article PTGui will be used.Īlthough image quality takes a hit, especially at the edges, results can be quite satisfactory. Processing can be done in software such as Hugin, PTGui, or PTLens. This works very well: the resolution loss in the corners stays small, and the angle of view remains the same as without defishing (you only lose small parts of the original picture in the corners).Images taken with a fisheye lens can be processed to yield a rectilinear image where straight features, such as walls or buildings, appear straight in the image. The results are quite good.įor landscape photos with a curved horizon you can also use the "stereographic projection" and dial in a positive or negative pitch (depending on if the camera pointed upwards or downwards when you took the photo). the picture is rotated, placed on a bigger canvas, Panini-defished, cropped and rotated again. If you choose "straighten horizon", the software will straighten the horizon using the algorithm on the lonelyspeck web page. If you choose the Panini correction, the result will be similar if not identical to Fisheye Hemi. I'll download your GUI tool over the weekend and try it out. Hi Fraenzken, sorry for sounding daft, but is this a tool that works in the same way as Fisheye-Hemi as demonstrated in the Lonelyspeck article? I have used Hugin to straighten out my Samyang 8mm fe photos in the past, as I had to crop a lot of the "defished" image out, defeating the purpose of getting a fisheye lense in the first place.ītw I've stopped using the lens after I bought a Canon EF-S 10-18mm lens, which has significant distortion at the edges, but no vertical curvature. I'm sorry to have to warn you though that I won't find the time to work on it in the next weeks. If you find any quibbles, feel free to post them here. That said, I tested the program thoroughly on my windows computer and am content with how it works. In fact, my programming skills are very rusty :-). I must add that I am by no means a professional coder. If you find any translation typos or wish to improve on my translations, just modify the file language.txt. I translated it into English but haven't got the time to translate the enclosed manual as well. You can defish a whole batch of pictures, modify defishing parameters individually before starting the calculations (or defish them all the same way, whatever you prefer), copy settings from an image and paste them to second one and much more. Moreover, every image can be rotated and its pitch corrected before defishing. The GUI allows to apply different projections (Panini, Miller, stereographic) and offers a method to straighten horizons I found on LonelySpeck. In order to use it, you need to install Hugin and tell DefishGui where to look for these two excellent programs (they are usually found in Hugin's subfolder "bin"). ![]() It uses Hugin's nona.exe to defish and Phil Harvey's exiftool.exe to preserve the meta data. ![]() I've written a defishing GUI for Hugin (running on windows). ![]()
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