May 2019
Intermediate to advanced
400 pages
14h 2m
English
I started my career in image processing. I worked in the Missile Systems Division of Hughes Aircraft on infrared images, doing things like edge detection and frame-to-frame correlation (some of the things that you can find in any number of applications on your mobile phone today—this was all the way back in the 80s!).
One of the calculations we perform in image processing a lot is standard deviation. I’ve never been particularly shy about asking questions, and one that I often asked in those early days was around that standard deviation. Invariably, a colleague would write down the following:

But I knew the formula for standard deviation. ...