habi.gna.ch » iphone

Rolex Learning Centre, EPFL Lausanne

habi — Fri, 20 Jan 2012 19:03:46 +0000

Also, wenn ich das nächste Mal ein Meeting an der EPFL in Lausanne habe, muss ich meine Panorama-Ausrüstung mitnehmen. Mit der 360Panorama-App sieht das Rolex Leanzentrum schon nicht allzuschlecht aus, aber da wäre noch mehr rauszuholen :)

iTunes update-check #fail

habi — Tue, 28 Apr 2009 17:53:07 +0000

is this a known problem for other iphone-owning readers of my blog?
iTunes tells me that there are updates for iPhone applications, I click on the “check for updates”-button and iTunes tells me — sometimes twice — that updates for my programs are available. i thus have to click multiple times to see the updates of which I already know that they’re available… quite annoying, don’t you think? does one of my readers have the same problem and even knows a resolution? I’d like to hear your tips.
a short screencast describing the problem can be seen below:

oh, and this post is also a test of jing :)

panoramas from (low quality) movies [update]

habi — Fri, 10 Apr 2009 19:51:26 +0000

whenever i’m spending a day outdoor, i love to take pictures, many of them turn out to be panoramas.

sometimes i leave my camera at home and only have my mobile phone with me. shoothing panoramas with the iphone is possible with panolab [link opens itunes], but very cumbersome. and i try to keep the annoyance of nina as low as possible while stopping on the slopes, so fiddling with my phone for longer than a minute or two is not an option.

recently i was thinking about a quick-and-dirty way of creating panorams with the iphone: wouldn’t it be possible to extract the images of a movie shot while panning the scenery and stitch those together to generate a panorama? today was the perfect way to test this out, on the slopes of the wonderful stockhorn.

the whole process is fairly easy, you only need

an iphone, jailbroken (or any other movie source :) ) with cycoder installed
cyberduck or winscp, depending on your platform
imageJ and
hugin

all these — very fine — pieces of software are freely available, most of them even free as in beer and as in speech.

step 1:
shoot a movie.

below are the movies i’ve used for this tutorial. both are made with the excellent cycoder.app, only for jailbroken iphones. use any other movie if you don’t have an iphone :) the movies are 384x288 pixels in size, as shown below, just press the play-button.

step 2:
get the movies off your iphone.

cyberduck and SFTP are my weapons of choice, YMMV, but there are tons of tutorials on the web, here’s one for the mac and here’s one for windows.
now you should have some movies on your hard-disk. cycoder has the nice feature to produce quicktime-compatible .mov-files, if you don’t have one of those handy, again, YMMV. (use the excellent handbrake to convert to and fro). quicktime is nice for the next step.

step 3:
import the movies into imageJ.

if you’re on a mac, this is just simple drag-and-drop, on windows you might be quicker altogether if you convert your movies to .avi-files, since installing quicktime for java can be a bit of a hassle, but can be done.

this opens your quicktime movie as a stack of images you can then scroll through. this image-stack can then easily be exported as an image-sequence using “File > Save as > Image Sequence…”. rotate the images if you’ve been dumb enough to hold the iphone wrong :)

then you’ll have a bunch of single images on your harddisk. if you’ve panned quite slowly like i have done, you’re probably gonna have much too many images (167 for the first and 139 for the second movie) to easily stich a panorama. for these movies, i’ve removed some images from the stack using the slice remover plugin. remove slices that are unnecessary like the ones at the beginning and the end, where your glove covers the lens. now having 20 and 32 images from both movies, proceed to the next step.

step 4:
import the images from the step above into hugin, align and stitch.

yes, that’s it, it’s really that easy.for the movies shown above i’ve also deleted some bad control points and stitched the panoramas normally and enfused, but this is entirely optional.the end-result looks like the images below. click them to see them bigger.

i know that both panoramas are not perfect. both are quite small, especially the second one has some artifacts and both have varying exposure. but keep in mind that i’ve only bothered nina for 29 seconds, the total time of both movies. not too shabby!

update:

arru from sweden left a comment about extracting the frames of videos using VLC, which is great, because it plays pretty much any movie-format.

since i couldn’t find it, i asked him to outline it for me via email. he agreed that i share his howto, which you can find below:

Extract frames in VLC:
Open VLC preferences, select “all” (as opposed to “basic”)
Go to Video->Output modules
Select ‘Image video output’ (this must be reverted to ‘standard’ when you’re done, to use VLC as a normal video player again)
Flip down the subgroup next to Output modules and select ‘Image file’
Choose ‘PNG’ as format (JPEG works too, but there will be some unnecessary quality loss)
Set ‘recording ratio’ to 10 (determines the number of video frames skipped between images — may need to experiment with this value if images don’t overlap correctly)
Press ‘save’ to exit VLC preferences
Open and play the video in question as you normally would (notice: there will be no picture — sound however, if applicable, and the VLC controls will move to show you the progress of the conversion)
Images are saved to the root of the main HDD on Mac OS X ( / ), on Windows I can only assume it will be C:
Don’t forget to reset step 2 to ‘Standard’ when you’re done
Throw images into Hugin and run one of the autopano scripts, and so forth

Thanks for that info, Arru!

i’m offline

habi — Thu, 25 Dec 2008 20:49:42 +0000

it seems harder and harder each year: whenever holiday season comes nearer, i by choice try to stay completely offline, so i can conquer my extralineophobia [1], read some books, go for walks, go skiing, cook nice and take some pictures (not that I buy a new camera each year). so, i’ve shut down my computer and switched off EDGE and WLAN on my phone, so I shouldn’t be too tempted to go online for the next few days. i’ll be back sometimes in early 2009. cu!

[1]: a term originally coined by pieceoplastic

[2]: the iPhone-application seen is SBSettings, only available on jailbroken iPhones…

softwaretipp für’s iphone

habi — Wed, 06 Aug 2008 18:56:59 +0000

gottago [1], ein projekt von codesofa.com und liip.ch ist eine ausgefuchste software für das neue iphone, welche dank der location-awareness des iphone den momentanen aufenthaltsort rausfinden kann [2] und dies direkt mit einer fahrplanabfrage der sbb verbinden verbindet.

das alleine ist schon mal ein killer-feature für diese auch schön gemachte applikation, aber dass ich in zukunft nicht mehr die etwas mühsame mobile seite der sbb aufrufen muss, ist natürlich auch super. denn eine fahrplanabfrage gestaltet sich mit gottago viel schneller und auch schöner. jedem auch nur manchmal-zugfahrer mit iphone im sack sei das stück software wärmstens ans herz gelegt!

bravo!

auf dem liip-blog hat’s noch ein paar mehr informationen dazu und auch ein nettes filmli, das die integration der google-maps applikation zeigt.

[via fscklog]

[1]: der link führt direkt in den itunes appstore

[2]: das funktioniert mit der neuen firmware auch bei meinem “alten” ohne gps wunderprächtig. die position ist dann halt einfach der momentan eingebuchte mobilfunkmast, aber bei öv-haltestellen sind das ja problemlose distanzen.

prioritäten…

habi — Mon, 09 Jun 2008 19:42:13 +0000

mein sms aus dem zug an kollege: “hey —–. bisch o am luege?: www.macrumorslive.com gruess usem zug. habi”

sein sms ca. eine halbe stunde später: “ja, und es isch e mega kuule match. vorem moleson. wo luegsch du fertig? gruss —–”.

ich hab’ echt nicht daran gedacht, dass die schon wieder schutten…

und nur, damit’s allen klar ist: herr jobs hat heute das neue iphone mit gps und 3g und sonstnoch viel coolem vorgestellt, was mich mehr interessiert, als 22 männer, die einem ball nachrennen. leiderleider ist das telefon erst erhältlich, wenn ich mich schon auf den rückflug aus kanada vorbereiten muss, also wird’s mit mitbringen wohl knapp… aber 199$ sind schon extreeeem verlockend… mal schauen, wie teuer das dann in der schweiz wird.

chm, der ist für dich!

habi — Fri, 02 May 2008 17:45:28 +0000

chm, da du meines wissens der einzige regelmässige leser meines blogs bist, der (auch) ein iphone besitzt [1], ist dieser eintrag vor allem (auch) für dich. ich hab’ soeben den WPtouch–plugin installiert, damit mein blog auf dem iPhone und dem iPod touch nett dargestellt wird. sieht nett aus, oder?

für alle, die iphoney nicht installieren wollen, so sieht’s die aktuelle webseite auf dem iPhone aus:

[1]: neopren-sigi vielleicht ja auch, aber dich kann mann ja nicht verlinken…