Wednesday, May 11, 2016

Correcting 360 Degree Stereo Video Capture

By Will Gaddy.  

There is an incredible back-shelf of technologies at A2Zlogix.  ScorpionCam was the codename of an internal R&D project we conducted from 2010 into mid-2011, when we were heavily involved in stereoscopic 3D.  I believe it has particular relevance today with the keen interest in multi-camera systems for spherical, stereoscopic live video capture to feed the new generation of VR devices such as Oculus Rift and Samsung Gear VR.  We’ve had this in our back pocket for a long time; I hope that this inspires people to understand that many problems associated with real-time stereoscopic spherical capture are in fact, tractable, and solvable – they were solved in 2011!

In a 3-part series, our CTO, Will Gaddy, walks through the relevance of the technology to stereoscopic 360-degree video capture, and document many of the steps we took along the way.  For the full details, please click here
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Monday, May 9, 2016

A2Zlogix, Inc. Shows Standard Dynamic Range (SDR) to High Dynamic Range (HDR) Upconversion Technology

By Will Gaddy.   

Converting SDR content

A critical component of the ecosystem for HDR is the need to convert legacy Standard Dynamic Range (SDR) content to HDR at very high quality. Although this is a very difficult technology problem, I explain how A2Zlogix’s ImageIQ® SDR-to-HDR upconversion works in our latest whitepaper. 

In essence, I explore what it takes to convert a low dynamic range and limited color gamut image to a high dynamic range image and full color gamut image – without artifacts or degradations.

Eigensystem Analysis

A2Zlogix’s patented approach to upconversion uses a method called Eigensystem analysis. This distinguishes whether the pixel is noise, in a textured region (and how much texture is there), if the pixel is in an edge region (and the orientation of the edge), or in the background.

SDR Image

The image below shows a 6-bit per channel with 75% Rec. 709 color gamut.  You can see banding in the sky gradient, with colors appearing “muted”, overexposed highlights and dark-greyish shadows.

Figure 1 - 6-bit per channel with 75% Rec. 709 color gamut

HDR Upconverted Image

The image below has been upconverted to HDR.  Note that the sky gradient is much more colorful, with no banding or stepping of colors.  Additionally, the sun is now a brilliant yellow and the shadow portions are completely black.

Figure 2 - 8-bit per channel with 100% Rec.709 color gamut

Most importantly, this is performed without the addition of any artifacts such as “ringing” around edges, and there is no loss of detail.

Read our white paper

ImageIQ® SDR to HDR upconversion is ready for low-BOM and parts-count-sensitive consumer electronics applications, cloud based applications, offline workflows, and real-time applications.   For more information, please see our white paper

Copyright © 2016 A2Zlogix, Inc., all rights reserved. US Patents 8,355,534, 8,484,438, 8,704,842, 8,712,095, 8,833,716, 8,837,826, 8,892,950 and pending. ImageIQ® is a registered trademark of A2Zlogix, Inc.  All other marks are trademarks of their respective owners.    

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