Emanuel A Guedes

I am amazed how the thin line between stylized reality and life is so often dumbfounded. [EDIT:] Phrasing Ebert: «Regarding the film's (...)str rating: It could be one, it could be four. What do stars have to do with it?»

http://www.imdb.com/title/tt1356864/ A marketing case? http://www.guardian.co.uk/film/filmblog/2010/aug/17/joaquin-phoenix-im-still-here Fair interesting and very contemporary the approach in my opinion.

Interesting links posted @ dvxuser.com [ LINK ] by Richard aka richtrav (dvxuser username): «(...) OK, this is turning out much longer than I expected, hope I don't ramble. Some things I'm making up names for (like a superpixel, which is just a pixel that has a full set of RGB values). When I refer to subsampling it just means skipping over pixels, or binning, which I'm taking to mean the process of sampling several pixels of the same color and generating a single value for all of them before that reading gets transferred to the data pipeline One place to look at a way chips use subsampling is by looking up a paper by Cypress for their full frame CMOS sensor, it's at: http://www.cypress.com/?docID=18524 Pages 5-8 show the different kinds of subsampling routines available for this chip and I would think there are quite a few other chip makers that use a roughly similar routine for generating live view/video. The paper is slightly techy but the pictures are pretty self explanatory, the sensor pretty much reads out a square of 4 pixels (1R 1B 2G) then skips over a predetermined number or rows before sampling another group. This seems like a pretty basic subsampling routine to me, nothing fancy at all. This method easily produces a new smaller resolution pattern, where each new pixel in the layout comes with a full set of R,G and B values (a superpixel) so no demosaicing/interpolation is needed. Note that, with the Cypress chip at least, subsampling instructions are hardcoded onto the chip (Table 2 shows the codes required to activate a particular subsampling mode). I'm guessing that this has probably been one of the most common methods to sample sensors for video/LV in the past. But that's just one way of sampling a sensor for video. Another method appears to involve scanning just one pixel (instead of a 2x2 group) then skipping to another single pixel farther along. This is apparently what Samsung does, and was deduced by the brilliant Falk Lumo when he was studying the Pentax K-7's video mode. By experimenting he concluded that the Samsung chip was reading every 6th pixel in video mode. A nice write-up of it is here: http://falklumo.blogspot.com/2009/06/k-7-as-movie-camera-part-i-technical.html Since neither Pentax nor Samsung published their methods at the time for subsampling he had to guess at the pattern being used so he came up with something like this based on the color shifts he saw in the videos: http://falklumo.smugmug.com/gallery/8729393_oDRh3/1/#577245567_vwSxZ-A-LB Now Falk is very smart and concluded Pentax was probably not optimizing its sensor based on the color aliasing he saw and actually proposed a subsampling pattern of his own that would make more sense: http://falklumo.smugmug.com/gallery/8729393_oDRh3/1/#577316092_vLWjd-A-LB Patterns like these (especially Falk's proposed improved pattern) would give you the 1536x1024 resolution image that would essentially be a checkerboard pattern; basically you'd have one superpixel with a set of full RGB values followed by a blank space of nothing, where colors would presumably have to be interpolated from the 4 neighboring superpixels. Samsung on their website has since advertised that their 14mp chip has a read 1 skip 2 mode and a read 1 skip 4 mode, which would be very close to what Falk hypothesized and Pentax may well have had a read 1 skip 5 mode custom done for their chips. Subsampling like this seems especially prone to color aliasing. And then there's Canon, the company that has attracted the most attention WRT its sampling routines. From what I've read on the web it uses a different implementation than either of the above (the entry on this thread is a good place to dive in: http://forums.dpreview.com/forums/read.asp?forum=1000&message=33265391). It's a little complicated so I'll try a simple explanation followed by a picture (thanks to DSPographer for helping me out with the pixel spacing especially). It appears Canon scans every third line on its sensor when in video mode. On these rows every pixel is read but it appears that 3 pixels of the same color get binned together. So horizontally pixels are getting binned in trios while vertically they're getting skipped over (this explains why color moire is worse on the horizontal axis than the vertical). What this does is create a new smaller bayer pattern 1/9 the size of the original sensor, so there are no "superpixels" at all with this method. Here is an illustration of what I think is happening: http://i73.photobucket.com/albums/i202/richtrav/Canonbinandskip.jpg If you do the math you'll see that even the 5DII wouldn't have enough pixels to form a 1920 wide pattern, so they're probably upscaling on all their cameras to get to "1080p". I don't know how they implement their 720 mode (maybe every 5th line???) but obviously fewer pixels are getting scanned. Their VGA mode seems to be based on a downscaled version of their 720 mode (except for the special crop mode on the T2i and 60d which appears to be a full scan of the center portion of the sensor) This makes it difficult to compare video "resolutions" of different cameras because they're all using different shortcuts to get there. The company that's probably doing it the best is Panasonic. Lord only knows how Panasonic is getting their video but it's a pretty good method, while the black and white resolution isn't much different from other cameras (which means still not close to true 1080) the GH1 can pick up fine details and textures missing from Canon and Pentax cameras. Sony seems to be picking up more detail as well with their new sensors, if you download the video here: you'll see at 1:02 a comparison of the VG10 with the Canon 550. The 550 certainly does curvy lines and fonts more smoothly but the VG10 is picking up detail completely missed by the Canon. UPDATE: No need to download the whole video, you can see still grabs here for the canon: http://www.point8cam.com/blog/wp-content/uploads/02.jpg and here for the sony: http://www.point8cam.com/blog/wp-content/uploads/01.jpg. I don't know how Sony is implementing their video either, you can get papers for some smaller Sony chips on their website that may offer some clues, like here: http://www.sony.net/Products/SC-HP/cx_news/vol55/pdf/imx032cqr.pdf. I would also guess that Nikon may have relied on Sony to help develop the 1080 mode for their new cameras. Well that's it, I'm tired - time for bed - hope this didn't bore you too much. I have tried a few very informal experiments with some of these cameras, they're on my photobucket account. Richard»

Keith, You know something? Tonight, I took a look on this 'shot on red' thread: http://reduser.net/forum/showthread.php?t=49294 And I thought to myself, Keith should register on reduser and post something over here ;-) Greetings from hot Rome, E. :-)

Apples to Oranges. :)

http://philipbloom.net/2010/09/01/canon-4k-concept-camera-and-first-images-from-canon-expo-on-ny/

Yes, it would be interesting. I am curious like Frank.

1080p sample available (courtesy of Nikon Polska): http://www.youtube.com/watch?v=Mx8wXa9SeJc&feature=player_embedded#!

:lol: :-) Odd and funny, how it is possible to release footage in that way.

Price should be around $500. A bargain, almost free for what it is.

I agree with both. As far as that sample concerns (a poor example I know), I don't see any aliasing though.

http://imaging.nikon.com/products/imaging/lineup/digitalcamera/slr/d3100/features01.htm http://www.nikon.com/about/news/2010/0819_d3100_01.htm Footage sample available: http://imaging.nikon.com/products/imaging/lineup/microsite/d-movie/en/background/index.htm H.264/MPEG-4 23.1 x 15.4 mm CMOS sensor (DX-format) for 14.8 million pixels AF-area modes for live view and movies - four AF-area modes depending on the subject: normal-area AF, wide-area AF, face-priority AF, and subject-tracking AF. http://imaging.nikon.com/products/imaging/lineup/digitalcamera/slr/d3100/features03.htm#f04 They say there are more 4 lenses to come with the camera release, among them a Nikkor AF-S 85mm f/1.4 G with Nano coating; 10 lens elements in 9 groups.

Try to click in, sorry, on that "Play" button inside the black rectangle, you'll see it will work by your means. Almost as simple as pressing the red button ;-) Hope it helps!

Yes Keith, you've been my english teacher of my online english course. Mine and of both of my two blonde and brunette secretaries to whom I'm used to dictate my replies to you (what type do you like most? Be gentle on the answer 'cause they both fell in love :lol: and nobody wants fights over here). We have more people attending our courses out there, plus instructors and so on, and some people need silence to work. Oh sorry, I forgot it is prime time in New South Wales. Next time, we'll think to add a program in australian english and culture (who knows it helps the number of attendees grow faster?). About your showreel request, send to us how much are you thinking to help us with our funding stuff (you know, some people need RED cameras or whatever cameras you want, for living, not only for pressing the record button and they cost money) and then we talk.

Is it a question or a statement both in disguise? 'cause if it is, I thought that many «über-variable English skills» you like to do mention in your words, they could explain a lot of "things". Yes, I was the only one over here from day one, when it was me who brought others, even before the usual guys you like to harass with. EDIT -- JFYI, in the recent RED DAY in Rome with Ted Shilowitz, 5% of people arrived with me, real people not any alias behind a keyboard somewhere in the planet Earth. The meeting occurred in Casa del Cinema's auditorium and was full of people, big one you know. But maybe 'cause RED doesn't exist, this had just been one of those nightmares of yours, a bad and real one. ;)

I hope you are in Genova for leisure but if it is for work and need anything, let me know. I have a good friend there. E. :-)

Stephen, Stop this. You know you've been one of the most valuable contributors @ reduser.net. As matter of fact, it would be helpful to read more posts from you over there, so don't feed this nonsense please? Greetings from Rome, E. :-)

No, the naysayers didn't start to flame there. But three years earlier under the Jim Murdoch period, when I was the only one here holding the RED flag, well before having others to jump with me to the RED boat aka filmmaker's gang joke. I'm sorry, I forgot you opened your current account later. ;)

Well, as Aristotle said, «the whole is more than the sum of its parts» ;-)

Otis has spent his last three years of his life to research and develop his full HD uncompressed camera. Photos released today: http://www.dvxuser.com/V6/showthread.php?p=2071409&posted=1#post2071409 Sample extracted from the prototype It seems we need a new sub-forum one of these days humm, Stephen? ;)

In these times when it is so easy to find the same shots wherever you go, here is a non-useless exercise as food for thought: EDIT -- OK, in this case, they are two but it is the second one that counts...

The first image that appears is the old BD - roll your cursor over it to see the same shot on the new BD from a 4K transfer.

Here is a BD example from a similar film source with the introduction of a 4K transfer in-between for the new Gladiator's BD version now available in Europe: [6 samples] http://comparescreenshots.slicx.com/comparison/68257/picture:0 Any doubts?

Yours and Jim's (btw, we all know he's reading these lines) point. Whether we like whether not, we cannot say Jim has no a successful business strategy. They're posts like yours that makes industry goes ahead. Digital included. All that digital vs. film stuff is just net plein/plenty rubbish.

:lol: On that, you're fully right.