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User: jacbo

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  1. Re:Powerful Technology, some ideas on how to use i on Automatic 3D Reconstruction of Scenes · · Score: 1
    In no way does this herald the end of scanning "like in LoTR".
    (which btw, was done with a laser based scanner called Polhemus, not a touch system)

    This type of image based capturing to recreate 3D models is nowhere near accurate enough to compete with laser based scanning systems. Just because some quicktimes look pretty, doesn't mean that this can generate accurate, quality, useable surfaces.
    It would appear that there is significant webbing .

    The system I use has an ISO accuracy of 0.02mm. Image based systems (exepting ATOSS) rarely approach 1 or 2mm in accuracy. Most can barely do 10mm accuracy.
    The high accuracy I get allows me to 3D scan a human face with enough detail to see the individual folds of the human iris.
    The best this image based thing would do for that is a blurry colored dot where the eye is meant to be.

    Also, it will only augment existing motion capture systems, not replace them.
    The amount of position samples per second is far below what Ascension or Vicon are able to do. It would need to interpolate an incredible amount if it were to be used in motion analysis.

    Forget trying to use this for crime scene analysis. I have been working with the police for years trying to develop a system that will stand up to the very intense scrutiny of the law and the courts.
    These sorts of things usually are only used for illustrative purposes, never as evidence or theroy proving devices.

    This sort of technology (or similar) crops up every few years and everyone gets exited about it's potential in everyday life.
    Rarely does it leave the lab for the real world of non-techie consumers.
    Often it stays in the domain of specialists who work in the field of 3D scanning.
    And even more rarely is it ever used for practical, genuinely usefull things.

    I use all of the types of 3D scanning available tody (image based, laser, CT, MRI and arm/mechanical).
    Each technique is intended for specific uses.
    No one system at the moment can be a "be all and end all" of 3D scanning.
    It is unlikely that such a system will be made available to consumers for many years to come.

    I'm not trying to put down the work done by these guys. In the context of what they intend to do, it really is an amazing peice of code. But don't try to apply it to things is wasn't intended to do, it's unlikely to produce useable results outside the areas it's intended for.

  2. Re:Not limited to space applications, by any means on NASA Prepares to Open Source Code · · Score: 1
    You seem to have missed the point about the rovers cameras being in a known co-ordinate space.
    Because the cameras are attached to the same armature that the enginers know the dimensions of
    (distance from the centre of each ccd is known), there is actually not much work at all for software to fake out some 3D.
    I'm not too sure how much you know about 3D scanning software or 3D scanning systems, but I've never used blue screens to do it.
    Picking common points in 2 images is exactly how the software JPL uses does it.
    The systems I use scan the actual surface, not interpret one from images.
    Using photos to generate 3D surfaces would have to be one of the most rudimentiary and inaccurate ways to 3D scan an object. There are a multitude of other techniques that can scan - phase/frequency ultrasound, laser triangulation, white light projecttion etc.
    Although, white light projection only works well in low light conditions.

    Using "real photo's" is in no way on a higher level to real 3D scanning.
    work in the 3D scanning industry, then you'll see what I mean.

  3. Re:Not limited to space applications, by any means on NASA Prepares to Open Source Code · · Score: 1

    Because the 2 cameras are in a known co-ordinate system, it's not at all hard to get 3D info from the images.
    If the images were taken with one camera in diferent positions, it would be impressive.
    Every day in my job I use these (and better) systems to "3D scan", and the stuff coming from the rovers is not all that great.
    The actual resolution is about +-10mm (at best). I get +- 0.5 mm daily with my Minolta 910 daily and have gotten +- 0.05mm with it.
    When a remote rover can 3D scan a 500m range with an accuracy of +-0.5mm, I will be impressed.
    When it can transmit that much data back to earth I will really be impressed.

  4. Re:Not through yet on Australia To Adopt U.S.-Style Copyright Laws · · Score: 2, Insightful

    I agree that the senate has the chance to stop this sillyness before it gets too far, but only if the senators themselves understand the issues properly.
    The media will "egemecate" the people and make everyone support a DMCA style system, because it would be unAustralian not to.
    Thankfully we don't have Senator "Plasma Dick" Alston to luddite his way through it all.

  5. Re:Big deal, where's the USB key? on Maya now Free for Personal Use · · Score: 1
    Upgrading your motherboard? Buy another license. Incorrect.

    I run my licence my laptop at home and my workstation at work. Licencing is based on either a flex dongle or a MAC address.
    I use the flex dongle because I can't swap out the laptops network card.
    There are no "licence transfer fees" or any nonsense like that. The licence.dat just needs to be on any of the machines you want to use it on.
    when you want to swap machines, move the dongle.
    it's still one machine at a time, but it's the machine I decide.

    At least it's not 3DSMAX which, once in a 32 machine lab, I had to get each individual request code, then enter the registration code. 32 times. stupid.
    ever heard of a site licence Discrete?

  6. Re:What moron posted this? on Maya now Free for Personal Use · · Score: 1
    Ummm........ no.
    It's not "Severly restriced and stripped", slighlty crippled yes.
    This program does exactly as the commercial version, with the only limitations of a watermark
    in the render and not being able to use it's files in the commercial version.
    There is no function missing from the free version that's in the Maya Complete commercial version.
    A person can learn the basics and goto the normal version and do exactly the same work.

    Also this is nothing new, Alias released the Maya PLE in verison 3. (PLE = Personal Learning Edition)

  7. Re:Some way to get a click... on DirectX Flaw Leaves Windows Vulnerable · · Score: 1
    If, like me, any one uses midi files as
    polyphonic ringtones they are in serious trouble.

    I can see the web banners now

    FREE POLYPHONIC RINGTONES - CLICK HERE

    This isn't a trivial problem, but a very major one.
    A new variant of SQL Slammer could be distributed to
    thousands of people suckerd by free ringtones.

    I'll be spending a lot of nights installing SP3 on my friends PC's.

    jacbo

  8. Re:Number one person to sign: on Evangelion Live Action Movie · · Score: 1

    Christopher Walken.
    Sure he's american, but he would sure make Gendo a very disturbing character.

  9. Re:Old technology on Doom For the SonyEricsson P800 smartphone · · Score: 1
    Ericsson released the first smartphone by a big vendor. It was the R380.

    It is very lacking when compared to current smart
    phones, but it was released 2 and a bit years ago.
    It's only real flaw was that it has a closed OS.
    Nokia's next release will not beat the P800,
    simply because a user with enough patience can write thier own apps for the P800,
    and it comes with 16Mb sony memory stick (which is only usefull in the phone).

    If you look at the specs, the R380 is almost a
    Clie with a teeny screen.

    no i'm not an ericsson stooge, just a normal stooge

  10. Cities in Flight - James Blish on Top 10 New Sci-Fi/SF Authors? · · Score: 1
    it's Classic Sci-Fi.
    The stories span many centuries of human future history. It's a collection of books written over 50 years ago.
    Check
    http://www.overlookpress.com/fiction/cities.shtml for more info.

    Jacbo

    - You cannot think about thinking, without thinking about thinking about something; Seymore Paypert -