By using the simple cross eye viewing methodology you can learn to see the depth in stereoscopic image pairs without the need of special hardware, although the technique might not be as easy and comfortable for longer use as using specialized hardware for 3D viewing. By following an easy tutorial and dedicating some time you’ll most likely be able to quickly pick up the technique to cross-view 3D content and to help you do that you can watch the video tutorial above prepared by Rhialto. The idea behind cross eye viewing of stereoscopic images is as the name implies by crossing your eyes, so that the left eye looks at the right image and the right eye at the left with the standard positions of the left and right images are reversed for that to work. You will learn to cross your eyes and focus in front of the stereo pair in order to fuse the two images into one that will have the stereoscopic 3D effect, so you’ll perceive the depth. This is precisely why when some stereo 3D images are presented for cross eye viewing they are labeled as such, because their left and right frames are reversed as opposed to normally the frame for the left eye being on the left and the right one on the right. You should be aware of the fact that most stereoscopic players photo and video do support the changing of the left and right frames inside a 3D photo or video, so you can easily switch them between parallel and cross-view format, even if they are not made for the one or the other by default.
September 27th, 2010 · 5 Comments · Other S3D Tech
December 9th, 2009 · 4 Comments · Other S3D Tech
Some time ago YouTube has added support for uploading stereoscopic 3D movies in a side by side format (left and right frame into a single video stream next to each other) and then view them in different mode. This feature has not generated too much attention, simply because there is still not that much stereoscopic 3D content that can be freely distributed. And to tell you the truth I’ve known for this YouTube feature for quite some time, but I’ve tried it just today by uploading a clip recorded with FRAPS to test it…
If you already have the stereoscopic 3D video clip ready you can quite easily upload it to YouTube and you just need to enter something specific in the field for tags at the end of the list of tags you’ve provided for your video. The tag you need to enter as a last one is “yt3d:enable=true” (without the quotes) as you can see in the screenshot above – have in mind that this tag needs to be at the end and not specifically to be the only one entered. And that is it your stereoscopic video is uploaded an being processed and when it is ready you should be able to view it in the available Stereoscopic 3D modes that YouTube currently supports.
Here s a list of stereoscopic 3D modes that the YouTube player currently support with the main focus being the anaglyph modes, but there is also support for cross-eyed viewing method that does not require special hardware and there are even experimental modes for row interleaved viewing for passive polarized display users and a few others (including option to view just the left or right video frame in “plain 2D”). As you can see so far there is not way for you to directly watch the videos in stereoscopic 3D mode if you are using Nvidia’s 3D Vision setup, but do not loose your hope as there is actually a quite easy workaround. You just need to download the High-quality or High-definition version in MP4/MOV format of the YouTube video you want and then play it back through the NVIDIA 3D Vision Video Player without problems. And if you have some issues with playing back the downloaded movie you might need to first setup the codec list of the 3D Stereo Player in order to add the installed MP4/MOV splitter/decoder in your system (Settings / Decoder / MPEG4 Stream Splitter).
Have in mind that there are some possible issues when sharing Stereoscopic 3D videos through YouTube. I’m talking about the limited resolution the Stereoscopic 3D videos are being processed at and then made available for the user. And then there is the issue wit the quality as when the video gets re-encoded with a lower resolution an bitrate than the original one being used, so watching through the player or downloading it afterwards might result in not that great quality. If you want to upload 1080p stereoscopic 3D video or even a clip with 720p quality to YouTube you should forget about that with the reason being that you still get 1280 and 1920 maximum width for the re-encoded content you’ve uploaded as stereoscopic content. So for true 720p quality you’ll be uploading video with resolution of 2560×720 that will be downsized to 1920×540 (1080p HD) and 1280×360 pixels (720p HD), so you might consider recording the video in one of these two resolution, if you plan to share it exclusively through YouTube. This way you might achieve better quality when the video is being just recompressed and not resized by YouTube, but still it depends on a lot of other factors so it still might be considered to be a trial and error at first.