jwatte's blog

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Some examples of images to classify

The question came up: Why would I go through the trouble of training a neural network, rather than just checking "is the ground in front of me gray-colored?"

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Machine learning and computer vision for autonomous rover racing -- step one

Some interesting news on my project to apply machine vision to the subject of autonomous rover racing.
I've been renting GPU processing power on the GPU processing power spot market (yes, there is such a thing) and training neural networks.

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How to harden a publicly facing server

The question came up: "How would I go about 'Hardening' the host server?"

In theory, hardening is a simple mixture between good configuration, good software, and good operational practice.

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Outline of a Scalable Web Backend

Here's a common question for newcomers to mobile game development, web game development, and similar systems:

How shall I design my application for scalability? And what do you mean by application, for that matter? Do you mean the whole iOS app/PHP/mySql system, or something else?

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Christmas Lights!

Adafruit has some cool, bendable LED strips. You can buy up to 4 meters of them in a continuous strip, with 30, 60, or 144 LEDs per meter. You send the color to each of the LEDs as 24-bit RGB, using a serial bus (single-ended SPI) and a simple protocol.

The protocol for these DotStar LEDs wasn't documented, so I had to figure it out from the sample code. It's pretty easy:

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How do I dependency?

So, if I were to build a brand new OS, not based on Linux kernel necessarily, what should packaging look like?

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Look what I came across

In the distant past, I made an effort to get various virtual world vendors to attempt to interoperate, such that various virtual worlds could be interconnected.
That would have been cool! Unfortunately, the competetive landscape ended up not supporting such an effort.

Here's a copy of the IETF draft that I posted at the time:

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Using the OpusFile library with Microsoft Visual Studio for Windows

The "opus" codec performs pretty well across a wide range of bit rates. When doing voice chat over the internet, or streaming music, or even including compressed music for a soundtrack for a game or other application, it is a pretty reasonable choice. Especially since it's free, as in beer!

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What is this I don't even? Android Google sign-in hell.

I recently changed the password for my two non-work Google accounts. As part of that, my Android smartphone (a Samsung Galaxy II with Android 4.3) got signed out of all of its Google services, and started asking me to log in.

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DFRobot Nova Basic Kit -- Test Report

The kind folks at DFRobot sent me a sample of their "Nova Basic Kit" to test out.

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