On Sat, Oct 11, 2008 at 10:26 PM, Nirav Patel <[EMAIL PROTECTED]> wrote: > My roomate and I wrote an auto-stitching Panorama Activity during the > Yahoo Hack Day at CMU yesterday (ended up winning the Hack for Good > award). I'll be posting it in the wiki at some point today. It needs > a whole lot of polishing, since it was written in 24 hours. > > I ran into the same problem that Ben did with autowhitebalance and > autoexposure. I looked through the ov7670 driver, and it seems > changing V4L2_CID_BRIGHTNESS should flip the auto exposure control > (AEC) bit in one of the registers. I added support for changing > brightness to the camera module in Pygame, but either disabling AEC > doesn't work, or it just makes auto gain control and auto white > balance work even harder to change the image. Other than that, the > stitching seems to work ok. I'm going to pyramidize it at some point > to make it faster, and do something to improve the accuracy. The > slowness of stitching doesn't effect the user experience much though, > because it only stitches after the user is done taking the pictures. >
So cool -- can't wait to try. > The Activity we wrote uses the Flickr API for an upload to Flickr > button. I feel that this is the most important part. There is > support for saving the stitched images as Journal entries, but it > would be wonderful if a kid anywhere in the world could see panoramas > taken by other kids elsewhere. Flickr is far from ideal for this. > Beyond not really being designed for viewing panoramas, it is > currently set up to just upload every picture to my personal Flickr > account. My API key, secret key, and an authentication token are > prerecorded in the activity, so anyone could potentially use those > values to edit existing photos and upload whatever to my Flickr > account: http://flickr.com/photos/nrpatel/ > Awesome! :-D Maybe one could set up a one-way upload script for this on dev (or some appropriate community-developed-web-services-server-of-the-future)? This script, then, could handle the uploading via flickr API securely. Regards Brian > It seems Gigapan doesn't have an upload API. gigapan.org works in > Browse on my os767 XO, but panning around an image is pretty slow. > Anyone have ideas on this? A better way to Flickr, ideas for > designing a new site, getting Gigapan to add an upload API, etc? > > The other issue we ran into is integrating OLPCGames with pyGTK stuff. > We used OLPCGames to take advantage of capturing the images as SDL > surfaces, but we also wanted pyGTK to pop up a Dialog box when the > user hits Save, asking for a Title, Tags, and a Description of the > panorama. We hacked together something that does pop up the box and > saves correctly, but fails to ever destroy the box. It then just sits > with the box open, preventing the user from using or exiting the > Activity. Is it possible to use pyGTK beyond the toolbox while still > using OLPCGames? > > Nirav > > On Fri, Sep 5, 2008 at 6:41 PM, Jeff Keller <[EMAIL PROTECTED]> wrote: >> Yeah -- I sent my loaner unit off to Burning Man, but I should get it >> back soon, and I'd be delighted to talk about stitchers. Randy >> Sargent and I wrote our own for GigaPan last summer because nothing >> else was up to the task. It relies on a model of the GigaPan device's >> behavior to do rough placement, but it can auto-stitch 1000+ images >> with < 10 pixels rms displacement error, and it should be open-sourced >> one of these days. Of course, it uses much more storage, RAM, and CPU >> than an XO has, but nothing inappropriate to what it does, and there >> are some nice improvements in the works. Oh, and my office is down >> the block from OLPC's. >> --Jeff >> >> On Fri, Sep 5, 2008 at 12:38 PM, Samuel Klein <[EMAIL PROTECTED]> wrote: >>> Speaking of which, Jeff Keller has been trying to get OLPC folks to >>> learn more about using his gigapan group's cameras (and perhaps to >>> borrow one to bring them into a country for weeks) for a while. Jeff, >>> Ben Schwartz and Nirav are really interested in large-scale image >>> splicing... >>> >>> SJ >>> --- >>> 617 529 4266 >>> >>> >>> On Fri, Sep 5, 2008 at 2:08 AM, Brian Jordan <[EMAIL PROTECTED]> wrote: >>>> *bump* >>>> >>>> http://wiki.laptop.org/go/Panorama_camera_activity >>>> >>>> (code? Nirav is interested in doing something similar!) >>>> >>>> Brian >>>> >>>>> On Wed, Jun 20, 2007 at 11:56 PM, Benjamin M. Schwartz <[EMAIL >>>>> PROTECTED]> wrote: >>>>> -----BEGIN PGP SIGNED MESSAGE----- >>>>> Hash: SHA1 >>>>> >>>>> The XO happens to be perfect for shooting stitched panoramic photographs, >>>>> due to >>>>> the swivel design. I tested it out in the OLPCHQ lobby. Then, I wrote a >>>>> simple >>>>> panorama stitcher in 50 lines of Python. It runs in 3.4 seconds on my >>>>> Core Duo, >>>>> producing this output: >>>>> >>>>> http://people.fas.harvard.edu/~bmschwar/lobby_ugly.jpg >>>>> >>>>> The results aren't too bad. I also tried stitching this scene with >>>>> Hugin, the >>>>> most powerful panorama stitcher I know of. Hugin required significant >>>>> user >>>>> intervention and half an hour of computing time, producing this output: >>>>> >>>>> http://people.fas.harvard.edu/~bmschwar/lobby_pretty.jpg >>>>> >>>>> This scene is unusually difficult because of the huge indoor-outdoor >>>>> contrast. >>>>> Given this positive result, I would like to work on a panorama-making >>>>> activity, >>>>> possibly inside Capture. I know that at age 10, I loved making panoramas >>>>> out of >>>>> photographs. Panoramas provide an immersive way for children to >>>>> communicate >>>>> their environments to each other and to the world. >>>>> >>>>> - --Ben Schwartz >>>>> -----BEGIN PGP SIGNATURE----- >>>>> Version: GnuPG v1.4.7 (GNU/Linux) >>>>> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org >>>>> >>>>> iD8DBQFGeU4yUJT6e6HFtqQRAv4rAJ9F5wTDfzz9piYzzwGskVVmaqZTiQCgjFru >>>>> QsRergUtY1iCZS6hIXCHjSM= >>>>> =v5GB >>>>> -----END PGP SIGNATURE----- >>>>> _______________________________________________ >>>>> Devel mailing list >>>>> Devel@lists.laptop.org >>>>> http://lists.laptop.org/listinfo/devel >>>>> >>>> >>> >> > _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel