Jason Banahan jbanahan

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

How to run Linux desktop in a corporate environment

DISCLAIMER

Some of the practices described in this HOWTO are considered to be illegal as they often break internal corporate policies. Anything you do, you do at your own risk.

Rails Migration

http://guides.rubyonrails.org/migrations.html

Migrations methods:

add_column
add_index
change_column
change_table
create_table
drop_table

	#include <stdio.h>
	#include <stdlib.h>
	#include <stdint.h>
	#ifdef _MSC_VER
	#include <intrin.h> /* for rdtscp and clflush */
	#pragma optimize("gt",on)
	#else
	#include <x86intrin.h> /* for rdtscp and clflush */
	#endif