If only we had better test content...

Mike Perkins I just saw this news about research that says you notice compression artifacts less if you like the content of a particular video clip: Using four studies, Kortum, along with co-author Marc Sullivan of AT&T Labs, showed 100 study participants 180…

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Posted In: Perk, Video

The Basics of 3D Image Acquisition

Mike Perkins One of our clients is heavily involved in 3D video and has been for several years. However, several are just now starting to think about it because of the uptick of interest in the consumer electronics world. Enough questions have been posed to us re…

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Posted In: Perk, Theory, Video

Thoughts on 3D after NAB

Mike Perkins I just returned from this year’s NAB show, where I was bombarded with 3D demos in virtually every booth. Most of the factors driving this 3D superabundance originate outside of the broadcast industry itself. First, TV manufacturers are hot on 3D as…

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Posted In: Perk, Video

Delta Sigma Converters: Filtering, Decimation, and Simulations

Mike Perkins In my first post on ΔΣ converters I presented an intuitive way to derive the modulator portion of the converter. Now we need to look at what comes after the modulator—namely, the digital filter and the decimator. The high-level structure of the c…

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Posted In: Perk, Theory

Delta Sigma Converters: Modulation

Mike Perkins The web is filled with introductions to Delta Sigma modulation (also sometimes referred to as Sigma Delta modulation) in the context of Delta Sigma converters. Unfortunately, the ones I’ve looked at fail to intuitively motivate how the modulator wo…

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Posted In: Perk, Theory

The Math Behind Analog Video Resolution

Mike Perkins The world is moving in the direction of HDTV, but NTSC “standard def” signals are still common for many reasons and will remain so. One important reason is that cameras that output NTSC are widely available and cheap! Many applications, including…

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Posted In: Perk, Theory, Video

Noise Floor

Mike Perkins As shown in a previous post, for samples taken from a zero mean i.i.d noise signal, the expected power of the k’th DFT coefficient is given by As discussed in that post, when plotting the power of the k’th coefficient as a function of frequency,…

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Posted In: Perk, Theory

IACP Product Introduction

Mike Perkins I just spent the last three days at the IACP show in Denver—the annual conference and expo for the International Association of Chiefs of Police. For anyone who was once a 12-year-old boy, IACP is about as cool as it comes, because there is all sor…

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Posted In: Perk

Working with CUDA

Mike Perkins We’ve recently been working with a cool technology that is rapidly penetrating scientific and engineering computing, but seems little known otherwise. It’s called CUDA. In a nutshell, it is an SDK to allow you to run parallelizable compute-intens…

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Power Measurements with the DFT

Mike Perkins Many of the systems we work on here at Cardinal Peak employ analog-to-digital conversion in one form or another. It seems like almost invariably some analog signal needs to be digitized or “sampled.” Sampling is the process of periodically lookin…

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Posted In: Perk, Theory
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