![]() ![]() The idea behind stereo photography is to take two similar photographs, but from different positions displaced horizontally (like our eyes). Stereo photography is very old, dating back to 1838, but some of the old stereo cameras and stereo photograph viewers, such as the one shown in Figure 41-1a, can still be found at antique shops. Stereograms evolved from stereo photography, in which two photographs are taken from slightly different camera positions (representing the displacement between our eyes). It all started back in the 1960s, when Bela Julesz, who worked at (AT&T) Bell Labs researching human vision-particularly depth perception and pattern recognition-created the random-dot stereogram (RDS). 41.1 What Is a Stereogram?Ī stereogram is a 2D image that encodes stereo information so that, when viewed correctly, it reveals a hidden 3D scene. The CD content, including demos and content, is available on the web and for download. You can purchase a beautifully printed version of this book, and others in the series, at a 30% discount courtesy of InformIT and Addison-Wesley. Have you ever tried this technique before? If so, can you give more information on how it's done? Share your thoughts/ideas/advice in the comments below.GPU Gems GPU Gems is now available, right here, online. ![]() Lastly, there was one more colour pass at the end, and voila. The only difference in the editing process was that depth was represented by luminosity - With much trial and error, we then ran the data through an algorithm which took each frame of depth information, converted it into a random dot stereogram image, and repacked it into the final video. Once we had our depth information, we unpacked it into image sequences and edited these sequences as if they were regular video. The computer was running software called RGBD toolkit, designed for capturing the depth information from the Kinect using its built-in infrared system. We collected real-time depth data of Young Rival performing the song using an X-Box Kinect hooked up to a computer. ![]() To make your own autostereogram, one must first create a thing called a "depth map" which is a 2D representation of 3D depth information. Here's an in-depth explanation on how it was done: So, how did Raab and his team approach making this? They used a technique that utilizes a Kinect and RGBD toolkit to produce incredible images - a similar technique used by Private School Entertainment's music video for Exist Elsewhere’s song “Tokyo”. (Here's a helpful tutorial.) The other is a cross-eye autostereogram, which is pretty self-explanatory - you cross your eyes until you see the scene. One is a parallel-eye autostereogram, which requires you to "relax" your focus and "look through" the image. There are two versions of Young Rival's music video, each of which requires one of two viewing techniques to be seen. Not everyone has the ability to see these images (those without two eyes or those with eye impairments), but there are several techniques you can use to bring the scene to life. These images, when viewed correctly, produce the illusion of depth perception - the ability to see a 3D scene from a 2D image. It might help to know exactly what a random dot autostereogram is. Continue on to see (or try to see) the video and learn how they pulled it off. These random dot autostereograms have been used for over half a century, but it wasn't until recently that director Jared Raab created the first random dot autostereogram music video for the band Young Rival's single "Black is Good". You know what I'm talking about - those pictures that look like nothing but static until you relax your eyes enough to see the hidden T-Rex or Eiffel Tower pop out in 3D. Chances are you've spent your fair share of precious time looking at (or trying to look at) one of those Magic Eye posters. ![]()
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