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MIT Camera Culture Group Update July 2009

by MIT Media Lab, Camera Culture group

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http://cameraculture.media.mit.edu

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Claude Florin, Principal at Venture Concept A nice overview of the advances in 3D computational imaging. 12 months ago
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Since we are adapting LCD technology we can fit a BiDi screen into laptops and mobile devices.
4 blocks : light, optics, sensors, processing, (display: light sensitive display)
Inference and perception are important. Intent and goal of the photo is important. The same way camera put photorealistic art out of business, maybe this new artform will put the traditional camera out of business. Because we wont really care about a photo, merely a recording of light but a form that captures meaningful subset of the visual experience. Multiperspective photos. Photosynth is an example.
Comparisons
Reversibly encode all the information in this otherwise blurred photo
The glint out of focus shows the unusual pattern.
put two projectors, one virtual projector at the middle, along this line, connecting the virtual light source, always destructive interference, does it make sense and right?
in wave optics, WDF exhibit similar property, compare the two,
the motivation, to augment lf, model diffraction in light field formulation
put two projectors, one virtual projector at the middle, along this line, connecting the virtual light source, always destructive interference, does it make sense and right?
Recall that one of our inspirations was this new class of optical multi-touch device. At the top you can see a prototype that Sharp Microelectronics has published. These devices are basically arrays of naked phototransistors. Like a document scanner, they are able to capture a sharp image of objects in contact with the surface of the screen. But as objects move away from the screen, without any focusing optics, the images captured this device are blurred.
This device would of course support multi-touch on-screen interaction, but because it can measure the distance to objects in the scene a user’s hands can be tracked in a volume in front of the screen, without gloves or other fiducials.
Since we are adapting LCD technology we can fit a BiDi screen into laptops and mobile devices.
Thus the ideal BiDi screen consists of a normal LCD panel separated by a small distance from a bare sensor array. This format creates a single device that spatially collocates a display and capture surface.
So here is a preview of our quantitative results. I’ll explain this in more detail later on, but you can see we’re able to accurately distinguish the depth of a set of resolution targets. We show above a portion of portion of views form our virtual cameras, a synthetically refocused image, and the depth map derived from it.
Our observation is that by moving the sensor plane a small distance from the LCD in an optical multitouch device, we enable mask-based light-field capture. We use the LCD screen to display the desired masks, multiplexing between images displayed for the user and masks displayed to create a virtual camera array. I’ll explain more about the virtual camera array in a moment, but suffice to say that once we have measurements from the array we can extract depth.

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Claude Florin, Principal at Venture Concept Tags photo mit 3d research ui 12 months ago
4d Social, Ph.D. candidate at Yonsei University 3 years ago
100floors , Product manager at 100floors 3 years ago
Keith Gerr, Principal at KRG 3 years ago
Paul Forest at Forest Games 3 years ago

MIT Camera Culture Group Update July 2009

by MIT Media Lab, Camera Culture group

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