Forum:
Tips & Tricks
Thread:
Samyang 8mm Fisheye Canon APS-C
|
Re: Samyang 8mm Fisheye Canon APS-C
Posted: 1 Apr 2010 at 0:10 GMT
updated: 1 Apr 2010 at 0:11 GMT
|
go to thread
|
|
I have the Bower for Canon and it looks exactly like the Samyang. Like the other guy said, that Bower photo posted by Smooth appears to have a different mount on it.
|
|
alert moderator
|
|
Forum:
Q & A
Thread:
8mm lens comparisons? Peleng, Sigma, Samyang
|
Re: 8mm lens comparisons? Peleng, Sigma, Samyang
Posted: 8 Dec 2009 at 18:56 GMT
|
go to thread
|
Are you saying the Samyang will be better quality than the Sigma? (I assume because of shooting more images) Or do you just mean better than the Peleng?
I have been kind of attracted to the Samyang because of the projection difference, though I have read every report I can find on these and have the impression the Sigma is a sharper, higher quality lens with less peripheral CA and flaring than the Samyang. Is that a correct conclusion? Was that a run-on sentence?
Thanks.
|
|
alert moderator
|
|
Forum:
Q & A
Thread:
8mm lens comparisons? Peleng, Sigma, Samyang
|
Re: 8mm lens comparisons? Peleng, Sigma, Samyang
Posted: 8 Dec 2009 at 17:21 GMT
|
go to thread
|
|
Thanks for that. It looks like the Peleng is quite a bit worse, though I assume the same photoshop trick could fix it.
|
|
alert moderator
|
|
Forum:
Q & A
Thread:
8mm lens comparisons? Peleng, Sigma, Samyang
|
8mm lens comparisons? Peleng, Sigma, Samyang
Posted: 8 Dec 2009 at 0:28 GMT
|
go to thread
|
I see a lot of talk about the Sigma and Samyang 8mm lenses here but not the Peleng.
How does it compare?
I've seen some reports that flaring is a problem with the Peleng. Is that any worse than with other fisheyes, or just something you have to live with since you can't have much of a lens hood on a fisheye lens?
Thanks.
|
|
alert moderator
|
|
Forum:
Galleries
Thread:
Samyang 8mm f/3.5 Fisheye Lens Test
|
Re: Samyang 8mm f/3.5 Fisheye Lens Test
Posted: 7 Dec 2009 at 19:02 GMT
|
go to thread
|
I can get the samyang file, but the sigma files seems like it's not there.
David B
|
|
alert moderator
|
|
Forum:
Q & A
Thread:
Stitching Video
|
Re: Stitching Video
Posted: 4 Dec 2009 at 22:29 GMT
|
go to thread
|
FYI,
These guys stitch up to 4 real time surveillance video feeds.
www.dspdesignline.com/showArticle.jhtml?articleID...
MindTree algorithm stitches video
By K.C. Krishnadas
Courtesy of EE Times
(12/01/2009 9:57 AM EST)
BANGALORE, India — MindTree Ltd. has unveiled a real-time video stitching algorithm as part of a video surveillance product. The company claims its patent-pending algorithm can stitch video from up to four cameras in real time.
Stitched video from multiple cameras increases field of view, providing better situational awareness to the viewer. The algorithm requires no scene training and performs dynamic feature matching and blending. A scene overlap of at least 5 percent is required for the algorithm to work.
Video stitching is typically deployed to provide greater coverage in railway stations, airports, retail stores along with border and coastal surveillance points. Video stitching is also deployed in high-end automobiles to enhance passenger safety by increasing the driver's field of view.
Vinod Deshmukh, Mindtree's president and CEO of R&D services, said it is offering "a suite of video analytics algorithms that include algorithms for display enhancement, video content analysis and video search and summarization."
The video surveillance solution includes three components: video analytics software, intelligent video management software and platforms. The analytics suite consists of algorithms that address display enhancements, video content analysis and video search.
Reference designs are available for digital video recorders (4-channel analog DVR and 16 channel hybrid DVR) and camera encoders (2/4 channel).
MindTree said it will license each component and provide customer support.
—K.C. Krishnadas is site editor of TechOnline India
|
|
alert moderator
|
|
Forum:
Q & A
Thread:
black lines in Hugin/Enblend output
|
Re: black lines in Hugin/Enblend output
Posted: 28 Nov 2009 at 0:32 GMT
updated: 28 Nov 2009 at 0:33 GMT
|
go to thread
|
Dropio must have had a problem. The files were gone when I just looked. They should stay for a month. I loaded them up again. Try again. Or try:
drop.io/EnbendLines/media
|
|
alert moderator
|
|
Forum:
Q & A
Thread:
black lines in Hugin/Enblend output
|
black lines in Hugin/Enblend output
Posted: 27 Nov 2009 at 0:46 GMT
|
go to thread
|
I have done some fairly large projects and and am getting something that looks like blend errors. They are 1 or 2 pixel wide black or sometimes colored lines.
Here are two examples cropped out from the large image.
drop.io/EnbendLines#
Note the spelling of EnBend.
|
|
alert moderator
|
|
Forum:
Q & A
Thread:
What should I do with the Pantheon?
|
Re: What should I do with the Pantheon? -3rd try
Posted: 22 Nov 2009 at 8:43 GMT
|
go to thread
|
Success!
I finally figured out how to manipulate the pitch in the preview screen and that did the last trick. I still need to fix of few control points but the method is working.
www.panoguide.com/gallery/1574/
|
|
alert moderator
|
|
Forum:
Q & A
Thread:
What should I do with the Pantheon?
|
Re: What should I do with the Pantheon? -1st try
Posted: 22 Nov 2009 at 1:25 GMT
updated: 22 Nov 2009 at 1:47 GMT
|
go to thread
|
They are 21 TIFF images, 23MB each. Is there a place I could put those? Or I could reduce them down and convert to jpg easily enough.
Try this:
drop.io/ryfaah8#
|
|
alert moderator
|
|
Forum:
Q & A
Thread:
What should I do with the Pantheon?
|
Re: What should I do with the Pantheon? -2nd try
Posted: 22 Nov 2009 at 1:23 GMT
|
go to thread
|
I added some more control points and corrected a few. Here is what I got:
www.panoguide.com/gallery/1572/ -equirectangular
www.panoguide.com/gallery/1573/ -fisheye
The eqr still has a few problems but looks pretty good.
The fisheye is weird. Why would it change so much from image 1571? I'm looking for something more like 1571, though centered on the top of the dome rather than seeming closer to one wall.
Thanks.
|
|
alert moderator
|
|
Forum:
Q & A
Thread:
What should I do with the Pantheon?
|
Re: What should I do with the Pantheon? -1st try
Posted: 21 Nov 2009 at 20:16 GMT
updated: 21 Nov 2009 at 20:19 GMT
|
go to thread
|
I have uploaded my first try at this. Someone please look at it and tell me what I am doing wrong:
www.panoguide.com/gallery/1570/
www.panoguide.com/gallery/1571/ (-cropped)
This is done with hugin using 21 shots and fisheye projection. I tried stereo projection and that was more distorted.
Autopan-SIFT-C was unable to generate any control points for this (none found). They are all done by hand. They may need some work. The top photo (center of projection) was hard to stitch in some cases because of the symmetry and lack of unique details in the grid of squares to keep myself aligned. I would have been lost without the sunspot. There may still be some control point alignment errors there.
I have several questions:
1. Why is the point of view shifted from the center of the dome? And why is the projection egg shaped rather than round?
2. Why doesn't the perimeter stitch up? It leaves triangular cutouts around the edge. The control points are good in those areas.
3. In the 1570 link I show the original uncropped output from hugin. Why would it throw some chunks down in the bottom corners so far away?
Thanks.
|
|
alert moderator
|
|
Forum:
Q & A
Thread:
What should I do with the Pantheon?
|
Re: What should I do with the Pantheon?
Posted: 15 Nov 2009 at 19:52 GMT
updated: 15 Nov 2009 at 20:00 GMT
|
go to thread
|
Thanks for that info. I'll look that over.
I think I would like to try two things.
First a flat circular image where ground level would be around the perimeter.
Second a 360/180 zoomable panorama like this:
www.panoramas.dk/panorama/cubeface-sizes/
Will PTgui do a 360/180 like that?
Thanks.
|
|
alert moderator
|
|
Forum:
Q & A
Thread:
What should I do with the Pantheon?
|
What should I do with the Pantheon?
Posted: 14 Nov 2009 at 20:42 GMT
|
go to thread
|
Hi,
I have a sequence of photos that cover the inside of the Pantheon. I stood in the center and took 360 deg of ground level. Then 360 of half way up the dome. Then the top.
How would you suggest I stitch this up?
It seems the programs I've seen so far just do one sequence stacked next to each other, and don't provide for another level above.
I'm not sure how to deal with the perspective in this situation since on a flat print the top of the dome needs to be compressed way down so the ground level can be stitched.
I'm starting out using Hugin. Any other suggestions that might allow stitching a mosaic rather than just a panorama?
I kept the same focal length for all the photos in that sequence, though I hadn't read this page are studied this much so I didn't fix the WB or exposure. Focus should be close to consistent since the distance was about the same for all the photos.
I did a 360 of the Eagles nest and Hugin did a great job of matching the unequal exposures, though I still nee to work on some of the stitching.
Thanks for any advice.
|
|
alert moderator
|
|
