Things I Learned: How Night Sight Photography on Pixel Phones Works

I've had a number of intersting photos and videos come out of the Pixel 6a over the last few months of camping—especially in New Mexico. Most of them involve evidence of things in flight—think meteors—during minutes long exposures. Clearly meteors don't fly overhead for minutes at a time, so I needed to better understand what the phone was doing. Here are the articles I found so far.

Astrophotography with Night Sight on Pixel Phones

Night Sight: Seeing in the Dark on Pixel Phones

Handheld Mobile Photography in Very Low Light

The third one was written by the authors for a conference, so is a bit more of a scholarly read than the first two. Together the papers address that the phone is using HDR+ techology to average over pictures to get a better picture, (hence the ability to capture the movement of meteors in a four minute exposure), but none of them mention if there might be parameters embedded in the video or associated image that reveal how long the meteor took to pass over head. Information like this would answer the question, was it a meteor, or an airplane?

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Cool Math Tricks: Deriving the Divergence, (Del or Nabla) into New (Cylindrical) Coordinate Systems

Now available as a Kindle ebook for 99 cents ! Get a spiffy ebook, and fund more physics The following is a pretty lengthy procedure, but converting the divergence, (nabla, del) operator between coordinate systems comes up pretty often. While there are tables for converting between common coordinate systems , there seem to be fewer explanations of the procedure for deriving the conversion, so here goes! What do we actually want? To convert the Cartesian nabla to the nabla for another coordinate system, say… cylindrical coordinates. What we’ll need: 1. The Cartesian Nabla: 2. A set of equations relating the Cartesian coordinates to cylindrical coordinates: 3. A set of equations relating the Cartesian basis vectors to the basis vectors of the new coordinate system: How to do it: Use the chain rule for differentiation to convert the derivatives with respect to the Cartesian variables to derivatives with respect to the cylindrical variables. The chain ...

The Alcubierre Warp Drive Tophat Function and Open Science with Sage

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The Valentine's Day Magnetic Monopole

There's an assymetry to the form of the two Maxwell's equations shown in picture 1. While the divergence of the electric field is proportional to the electric charge density at a given point, the divergence of the magnetic field is equal to zero. This is typically explained in the following way. While we know that electrons, the fundamental electric charge carriers exist, evidence seems to indicate that magnetic monopoles, the particles that would carry magnetic 'charge', either don't exist, or, the energies required to create them are so high that they are exceedingly rare. That doesn't stop us from looking for them though! Keeping with the theme of Fairbank[1] and his academic progeny over the semester break, today's post is about the discovery of a magnetic monopole candidate event by one of the Fairbank's graduate students, Blas Cabrera[2]. Cabrera was utilizing a loop type of magnetic monopole detector. Its operation is in...

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