Tuesday, July 25, 2017

A New Sampling Algorithm Could Eliminate Sensor Saturation (scitechdaily.com)


A New Sampling Algorithm Could Eliminate Sensor Saturation (scitechdaily.com) 70

Baron_Yam shared an article from Science Daily: Researchers from MIT and the Technical University of Munich have developed a new technique that could lead to cameras that can handle light of any intensity, and audio that doesn't skip or pop. Virtually any modern information-capture device -- such as a camera, audio recorder, or telephone -- has an analog-to-digital converter in it, a circuit that converts the fluctuating voltages of analog signals into strings of ones and zeroes. Almost all commercial analog-to-digital converters (ADCs), however, have voltage limits. If an incoming signal exceeds that limit, the ADC either cuts it off or flatlines at the maximum voltage. This phenomenon is familiar as the pops and skips of a "clipped" audio signal or as "saturation" in digital images -- when, for instance, a sky that looks blue to the naked eye shows up on-camera as a sheet of white.

Last week, at the International Conference on Sampling Theory and Applications, researchers from MIT and the Technical University of Munich presented a technique that they call unlimited sampling, which can accurately digitize signals whose voltage peaks are far beyond an ADC's voltage limit. The consequence could be cameras that capture all the gradations of color visible to the human eye, audio that doesn't skip, and medical and environmental sensors that can handle both long periods of low activity and the sudden signal spikes that are often the events of interest.

One of the paper's author's explains that "The idea is very simple. If you have a number that is too big to store in your computer memory, you can take the modulo of the number."

Sunday, June 18, 2017

Road to the Holodeck: Lightfields and Volumetric VR

It's come and gone, but it looked to be very interesting.


What's a lightfield, you ask?

Several technologies are required for VR's holy grail: the fabled holodeck. We already have graphical VR experiences that let us move throughout volumentric spaces, such as video games. And we have photorealistic media that lets us look around a 360 plane from a fixed position (a.k.a. head tracking).
But what about the best of both worlds?
We're talking volumetric spaces in which you can move around, but are also photorealistic. In addition to things like positional tracking and lots of processing horsepower, the heart of this vision is lightfields. They define how photons hit our eyes and render what we see.
Because it's a challenge to capture photorealistic imagery from every possible angle in a given space -- as our eyes do in real reality -- the art of lightfields in VR involves extrapolating many vantage points, once a fixed point is captured. And that requires clever algorithms, processing, and whole lot of data.

Friday, June 16, 2017

What is HDbitT?

What is HDbitT?

A new standard protocol of digital connective, the next generation solution for AV over IP.
HDbitT stand for High-Definition Digital bit Transmission Technology, It’s a new standard protocol of digital connective , specilized in professional Audio/Video over IP delivery and transmission.

HDbitT enables high-definition Audio/Video up to 4Kx2K@60Hz transmit via network cables, optic fiber, power line cable, wireless and even more transmission mediums, it provides more stable performance, better image clarity, further transmission distance and other significant advantages, easily to facilitate the requirement of HD signals long-distance transmission without any converter.