tag:blogger.com,1999:blog-64524182009-11-18T10:21:01.589+01:00Bits and odds, flotsam and jetsam. Mozilla, GMail, you call it...Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.comBlogger68125tag:blogger.com,1999:blog-6452418.post-7704768448441884952009-11-06T16:43:00.002+01:002009-11-06T17:13:54.417+01:00

The graph below shows how many marriages there have been in France in 2008, depending on the size of the municipality -- rural, small town, bigger town, even bigger, and Paris and its surroundings. Base 100 is the average for the darkest and coldest months of the year, January to March.What is striking is that from October to April the pattern of weddings is pretty much similar in all

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com0tag:blogger.com,1999:blog-6452418.post-9793429299901689202009-11-02T22:44:00.002+01:002009-11-02T22:54:15.026+01:00

Hand painted muralOriginally uploaded by Seb Przd

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com0tag:blogger.com,1999:blog-6452418.post-14190513997693912232009-05-18T11:28:00.001+02:002009-05-18T11:28:37.274+02:00

In the poolOriginally uploaded by alexispz

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com3tag:blogger.com,1999:blog-6452418.post-24118601011468084192009-05-06T11:49:00.002+02:002009-05-06T11:55:17.621+02:00

I upgraded recently to Kubuntu 9.04 "Jaunty", and I made the mistake of installing PulseAudio, the "new generation" audio system for linux. What a mistake. I then spent several hours trying to get sound working again - there is a thread in the Ubuntu forums with more than 125 pages of people complaining about PulseAudio, and this is not counting the whole collection of other threads on the same

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com2tag:blogger.com,1999:blog-6452418.post-10091215079615255612009-04-17T14:14:00.001+02:002009-04-17T14:16:12.756+02:00

A fun way of displaying pictures.Roy Tanck's Flickr Widget requires Flash Player 9 or better.Get this widget at roytanck.com

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com0tag:blogger.com,1999:blog-6452418.post-25558569453415332052008-08-26T10:51:00.002+02:002008-08-26T10:54:34.002+02:00

1.9 gigapixels: My largest panorama yetOriginally uploaded by Seb PrzdWith the help of a new computer with 4GB of RAM I have been able to stitch very large images. My newest record is 1.9 Gigapixels, from 372 images shot over a 15 minutes span. The weather conditions were not good, and the exposures vary a bit over the image.It took a bit more than 2 days to set up the control points (automatic

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com4tag:blogger.com,1999:blog-6452418.post-70575173136132356782008-01-29T12:19:00.000+01:002008-01-29T12:31:25.445+01:00

Pano2VR has a new feature of interactive VR movies (or said another way, video immersive panoramas). Here is my first attempt (the video is over 3MB, please be patient if you want to enjoy it fully).You will be travelling inside a torus made of Villarceau circles.Click here to view the immersive video.

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com2tag:blogger.com,1999:blog-6452418.post-11355269143965970062007-11-22T14:12:00.001+01:002007-11-25T07:52:41.883+01:00

Cartoon Castle and Flowers Originally uploaded by Seb Przd Flash 9 version, made with the trial version of Pano2VR.

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com1tag:blogger.com,1999:blog-6452418.post-55691820356606710002007-10-21T13:47:00.000+02:002007-10-26T22:09:36.614+02:00

This is a work-in-progress as I figure out what are the necessary steps one has to take to go from a scratch installation of Ubuntu (or Kubuntu, or Xubuntu) to a building environment for source packages of hugin and its related tools (autopano-sift-c, libpano13, enblend). This has been tested in Kubuntu Edgy Eft and Feisty Fawn, but of course no installation is ever the same and I would welcome

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com1tag:blogger.com,1999:blog-6452418.post-32622685697294376762007-09-24T16:04:00.001+02:002007-09-25T13:05:51.310+02:00

Slice of Menger Originally uploaded by Seb Przd What happens when you slice a Menger Sponge diagonally through the center? well, a very interesting pattern of stars and hexagons. This is the level four iteration on the Menger sponge.I haven't seen this mentioned before on the internet. Maybe a reader will know if these intersections of the Menger Sponge have been studied before? Wolfram

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com1tag:blogger.com,1999:blog-6452418.post-6404887608834222442007-09-09T20:24:00.000+02:002007-09-09T20:58:55.922+02:00

Ever since version 3.0 of enblend was introduced, there has been an annoying bug with the way the zenith is blended (and also, it seems on some vertical lines). Development of enblend is not very transparent, and it is not very clear whether this bug has been acknowledged by the developer. So here is my attempt to explain a bit more what is happening and give the repeatable conditions under which

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com0tag:blogger.com,1999:blog-6452418.post-5467335504887745502007-09-06T22:15:00.000+02:002007-09-06T22:36:05.370+02:00

Four rectilinear projections with carefully selected field-of-views to produce a 360° panorama without corners (almost). You have to view the original panorama to compare. There are other "multiplane perspective" panoramas, loosely inspired by this paper.Here is the script to be used in MathMap.How to use this scriptLoad a suitable equirectangular image in Gimp (with four walls in a rectangle -

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com2tag:blogger.com,1999:blog-6452418.post-53083179716467575622007-08-25T14:00:00.000+02:002007-08-25T15:07:00.588+02:00

If you've been following my stream on flickr you will have seen a pattern to be folded into a cube, with a panorama printed on it so you get a "Virtual Reality Cube". The pattern looks like this (click on it to go the flickr page where you can download a large version of it). Here are the instructions to fold this cube created by Shuzo Fujimoto. You will need to refer to the pattern of folds to

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com7tag:blogger.com,1999:blog-6452418.post-18528297212037043772007-08-17T14:43:00.001+02:002007-08-17T14:43:48.434+02:00

Four years old recursive picture Originally uploaded by quinnums Another way of doing a Droste with your children!

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com0tag:blogger.com,1999:blog-6452418.post-49810767611622859012007-08-13T13:33:00.001+02:002007-08-13T13:33:20.700+02:00

Conformal Cube vs. Gnomonic Cube Originally uploaded by Seb Przd What you see here is the result of a long and complicated search, but with an enormous amount of help from Daniel M. German I've able to construct the conformal projection of the cube. If your first reaction is to mutter: "The what of the cube?" or just "So?", and if you are interested, please follow these explanations...You

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com2tag:blogger.com,1999:blog-6452418.post-64531398050586228922007-08-11T14:06:00.001+02:002007-08-11T15:00:13.269+02:00

Often the most difficult part of an equirectangular panorama (360° wide, 180° vertically) is the nadir, i.e. the bottom. This is where the tripod is, so no clear shot can be had without some sort of acrobatics to tilt the tripod away. So an important part of creating a nice equirectangular panorama is editing the nadir (and sometimes, the zenith).The procedure I had been using so far is:Create

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com0tag:blogger.com,1999:blog-6452418.post-59424805427270333002007-07-03T10:34:00.001+02:002007-07-03T10:36:50.018+02:00

MinivilleOriginally uploaded by seb przd You liked to play SimCity when you were young(er)... now let the others play it for you. It seems that every time somebody clicks on the link for a city, the population increases by one, or something else happens: you get links for the environment, industry, transportation, etc. So it's like SimBlogCity...(if anybody is still reading this blog, go ahead

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com0tag:blogger.com,1999:blog-6452418.post-1162381878243019502006-11-01T12:37:00.000+01:002006-11-01T12:56:13.893+01:00

1. Start with an image showing the frame you want to use for your Escher "Print Gallery" photograph. The highest the resolution, the better. 2. Rotate and crop the source image so that the center frame is dead in the center, and the aspect ratio of the whole image is the same as the center frame. Also, now may be a good time to correct any problem in the source image, check levels and sharpen a

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com5tag:blogger.com,1999:blog-6452418.post-1161883518327625642006-10-26T19:18:00.000+02:002006-10-31T14:49:29.330+01:00

Why you should correct for barrel distortion Originally uploaded by Seb Przd. All zoom lenses are prone to a type of distortion known as barrel distortion, where straight lines appear curved as if the center of the image had been inflated. This is especially the case with the less expensive zoom lenses; usually more expensive lenses, lenses with less zoom range and prime (fixed) lenses

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com1tag:blogger.com,1999:blog-6452418.post-1161807998503130572006-10-25T22:19:00.000+02:002006-10-25T22:26:38.520+02:00

Turkish Delight Originally uploaded by Seb Przd. Having fun with conformal mappings.

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com0tag:blogger.com,1999:blog-6452418.post-1152256969316627372006-07-07T09:18:00.000+02:002006-07-07T09:24:00.756+02:00

Honey I Escherized the kids! Originally uploaded by Seb Przd. Conformal mappings are great: it's a very powerful branch of mathematics, which basically says you can deform almost any 2D object and transform it into something else while keeping the shape of objects the same (on a small scale). Hence this picture: you see no holes, no obvious distortion, but this image cannot be real. This

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com1tag:blogger.com,1999:blog-6452418.post-1144655367054627482006-04-10T09:41:00.000+02:002006-04-10T09:49:27.083+02:00

Why do you still need tilt-shit lenses with digital cameras ?The first image was shot "as is" of the Saint Ambroise church in Paris with a wide-angle lens. The second one is the same one, but corrected for perspective distortion with hugin.

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com1tag:blogger.com,1999:blog-6452418.post-1144334517182919182006-04-06T16:41:00.000+02:002006-04-06T16:43:05.043+02:00

Bois de Vincennes (3) Originally uploaded by Seb Przd. I've been going through a full immersive panorama phase recently that has me going shooting many pictures from one spot in all directions. I've even bought a new ultra-wide-angle lens (Canon EF-S 10-22mm) so that I have to take fewer pictures. I'm waiting for my spherical tripod head to arrive (Nodal Ninja). You can see more of my

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com0tag:blogger.com,1999:blog-6452418.post-1135954569930122602005-12-30T14:13:00.000+01:002005-12-30T15:56:09.986+01:00

The european answer to Google? it's called Quaero (I search, in Latin). Quaero will be unveiled in January. I have the awful impression that it's full of hot air ("Say goodbye to text-based search, and welcome multimedia search"). Anyway, the funniest part is that they don't even have the domain name http://www.quaero.com ("High Performance Marketing !"), registered to QUAERO CORP., a

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com2tag:blogger.com,1999:blog-6452418.post-1117023371870497562005-05-25T13:54:00.000+02:002005-10-05T14:17:56.780+02:00

The answer, if the wine is from one of the best years of the past century, if it is from a reputed château, if it costs between $1500 and $2000 a bottle, and if you have 500 bottles of it, seems to be that you have to change the cork every 40 years or so to prevent the cork from going mouldy. This is what Stanley Ho, a casino magnate in Macau, has just done. According to this AFP story (in French

Sebhttp://www.blogger.com/profile/05122113621115715468noreply@blogger.com0