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Copyright 2018 Moddable Tech, Inc.
Peter Hoddie
Patrick Soquet
Updated December 17, 2018
The I/O class pattern is designed to be applied to many different interfaces. These include digital, analog input, SPI, I2C, serial, TCP socket, UDP socket, etc. Each of these defines a class pattern for the interface (e.g. a Digital class pattern) that is a logical subclass of the I/O class pattern.
The I/O class pattern assumes read and write operations will not block for significant periods of time (this is deliberately not quantified). The model for this is non-blocking network sockets.
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Image stacking is a collection of related techniques used in astrophotography which all use multiple images taken by a camera to achieve a more detailed photo than would otherwise be possible. I’ve talked about image stacking in the past, but I hand-waved the statistical parts a bit. In this post, I want to dig into those mathematical details so that you understand why image stacking actually works.
But first, I’ll tell a story about thermometers. We’ll come back to image stacking after that.
Let’s imagine you’re a scientist, and you need to know the temperature of the room you’re in to within a tenth of a degree in order to run an experiment. You dutifully order a super expensive NIST-traceable thermometer online, but on the day it arrives, you open the box only to discover that you got a hundred cheap alcohol thermometers instead.
The expensive thermometer would have done the job to within a hundredth of a degree, but now it’s too late to wait for a new one to arrive, and all you have are these che
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| echo(//\u000A\u002A\u002F | |
| "Hello World!"); | |
| }} | |
| //\u000A\u002F\u002A | |
| PhpJava::main(); |
