Tag Archives: fisheye

Commoditization of Car-Mounted Immersive Imagery

PixKorea Car

PixKorea Car. They use digital SLRs with fisheye lenses. The mechanical rig can change heights. Cool.

Sorry it’s been a while since my last post.  I’ve been busy with family, work, my dog ate my home work, had to wash my hair…

I was invited to give a talk at a conference in Seoul, Korea called National Spatial Data Infrastructure Expo 2009 (Sep. 9-11).  I spoke about “How to Paint the World,” which stressed on the importance of a framework for capturing, processing, storing and distributing photorealistic, immersive, interactive content of our world for various applications (e.g. local search).  Ok, that sounded fancier than it actually was (or perhaps more boring than it was?).

But that isn’t the gist of this blog.  I wanted to write about how pleasantly surprised I was to see so many street-level, car-mounted camera aquisition systems in the show floor of the expo.  I think I saw at least 5 companies doing that when I walked around half the show floor, with various configs and cameras.

Car-mounted ground-level immersive imagery

This car uses Point Grey's Lady Bug (red on top) as well as digital SLRs on the bottom. Not exactly sure why.

IMG_1727

This car uses Point Grey's Lady Bug and two GPS's to determine orientation. When asked how well that worked, the answer was ambiguous.

In general, I am seeing a bunch of companies being formed that have a car-mounted system for street-level panoramic acquisition around the world.  I’m glad to see this, since it feels like another step towards this content type being useful and in demand.  But ultimately, street content will be commoditized (even before it can be monetized — but that’s whole other topic).

So, what does this mean?  Well, it means the consumers win in the long run.  It also means that the competition will hopefully improve the image quality of this exterior content (really lead by Google Street View).  Further differentiation and innovation needed to win in the competitive market will push the innovative minds to do a lot more than just display panoramas — enabling mashups, UGCs, improving extensibility and maintainability, encoding a whole lot more geo info, getting INTERIORS (a-hem!) etc. will be necessary for survival.  As I said, this should all be good for the consumers, if it pans out this way.  Yay.

It’s still a bit early to tell who, how, what will win or lose.  And somewhat surprisingly (to a US-centric person), Google is not winning else where around the world.  Yay.


Why Peleng Lens Sucks for Panoramas

When taking images for panoramas, a lot of folks use circular fisheye lenses — the wide field of view means less pictures to cover the full 360 x 180 degrees, so you can acquire less and stitch faster.

I played around with various lenses out in the market for panoramic photography trying to balance price vs. quality.   One of my favorite is Sigma 8mm, but unfortunately, Sigma is really hiking up their prices — what used to cost around ~$500, is now up to ~$900 (MSRP $1230!).  Can you say “exploitation?” Something’s going on.  (If anyone knows what’s up here, pls comment!)

Naturally, I looked for an alternative and found Peleng 8mm at less than half the price!  But in testing it out, it ended up being not acceptable for professional panoramic photography.

Peleng 8mm Fisheye Lens

Peleng 8mm Fisheye Lens

Here is my main reason for saying this is unacceptable — two words: lens flare.

Peleng 8mm Lens Test

Peleng 8mm Lens Test

Notice the flares on the bottom right (from light source on upper left) and bottom left (from light source on upper right) of this image.  The resulting panorama is below:

Peleng 8mm Lens Test: Stitched Pano

Peleng 8mm Lens Test: Stitched Pano

Now notice the flares creeping into the stitched panorama above on the bottom left.  (Pls click on the image to see a higher resolution panorama.)  Although this issue can be “solved” by cropping tighter or Photoshopping, this then messes up enough things to a point I would rather use a better (but more expensive) lens.

Other things like the lens not fitting in snugly to the camera, having a hard time taking the lens off, manual controls, etc. make me think that it’s not worth the savings for the risk of taking bad pictures for our customers.

Peleng, if you are reading, please let us know when you’ve improved and resolved some problems.  Until then, we are sticking to Sigmas.

Anyone out there have a similar experience?


Panoramic Equipment

I’ve been taking panoramic images  for over 10 years, and I’ve been using various gears for taking them — cameras, lenses, rotating heads, tripods, and GPS.  Curious about what I use now?  Here’s my list.

Lens

My lens of choice is Sigma 8mm fisheye lens.  In general, I prefer the fisheye lens since the field of view is very wide, i.e. need to take less amount of pictures to cover the full 360 x 180 degrees; i.e. faster.

The optics is quite good, and we’ve had very few of them fail.  There’s some chromatic aberration, but typically stitching software takes care of that.

Sigma 8mm Fish Eye Lens

Sigma 8mm Fisheye Lens

Camera

My camera brand of choice is Canon.  We’ve tried Nikons but they failed a lot more for us under extreme conditions (ask me if you’re curious).  I currently use Canon T1i, which has a 1080p video recording capability. Awesome camera.

Canon T1i

Canon T1i

Because the T1i is not a full frame digital SLR, when used with the Sigma 8mm, the circular fisheye image is cropped.  But I actually prefer the crop for better “resolution” of the scene.

Panoramic Tripod Head

My choice for panoramic tripod head is Nodal Ninja R1.  It’s light, compact, sturdy, and precise. Also, because the mount attaches to the ring-mounted lens (see images below), you don’t have to worry about messing up the focus of the lens — I initially had some trepidation about this, but not any more.

Nodal Ninja R1 Ring-Mounted Camera

Nodal Ninja R1 Ring-Mounted Camera

So there.  What do you use to take your panoramas?  Care to share?


Follow

Get every new post delivered to your Inbox.