Everything connected to the Python language
It is time to start looking at the processing of night photos. I’m going to start with the end of the workflow, as it’s simpler to explain.
I made a small Python script and a full app that will contain all the different tools that will be discussed in this series.
Well, not too much background noise at least!
I love photos, and I’m beginning to get into astrophotos as well. One issue I face is how to get long exposures from the sky when you have light noise. I want to see arcs in the sky, but the longer you expose, the brighter the background becomes. The same problem occurs if you are using a polar tracker, you get more light, but also more noise!
So I decided to get a small script together to generate images like this one:
It feels a little bit artificial because the noise is minimal and because there are not that many small stars, but it’s a good start. The script is very easy, it just reads all images from the command line pattern, and then gets the maximum pixel value for all pixels across these images. Saving in “result.jpg”, and this is it!
| # -*- coding: utf-8 -*- | |
| import glob | |
| import sys | |
| import numpy as np | |
| from PIL import Image | |
| def readFiles(images): | |
| loaded = [np.asarray(Image.open(img)) for img in images] | |
| return np.array(loaded) | |
| if __name__ == "__main__": | |
| r = np.max(readFiles(glob.glob(sys.argv[1])), axis=0) | |
| Image.fromarray(r).save("result.jpg") |
The script doesn’t try to align images at all, as we want to see the arcs (at least I want to!), so to use this script, you need to capture many images on a tripod and a remote control.
Anyway, easy, there may be other small scripts like this in the future, who knows.
I’m a huge fan of home automation. I started studying the KNX standard more than a decade ago, and I wanted to automated everything in my home. One day.
In the last decade, we saw the apparition of lots of new standards, not just for lighting and heating, but also for everything else. Unfortunately, it’s rarely compatible with each other. I saw a few projects int he fast, and recently saw HomeAssistant in an article, and decided to try it.
After a long pause, I’m pleased to announce the release of Audio ToolKit 3.3.0.
After a long pause, let’s go on on our MT2 discovery trip. Last time, we analyzed the perfect gyrator that is sometimes used to replace coils.
Audio ToolKit is finally updated to 3.2.0. The main changes for this release are mainly cleanup of the API and better C++17 support with variable defaulting.
While I was reading an article on Google last Deep Learning achievement, I was reminded of a previous discussion with former colleagues about replacing reservoir simulations with neural networks. At the time, I dismissed the idea as ridiculous due to the complexity of the task and the requirement for the training.
But now, Google seems to have done it. Or have they?
While I’m playing with Javascript and React, I’m also going on with using Python and Flask to build a backend. To have meaningful statistics about my app usage and what to optimize, I wanted to centralize logging somewhere.
As I’m starting to play with Flask, I had to deal with several backend servers and decided to use traefik proxy for them.
On my quest for a good Flask book, I saw this book from Tarek Ziade. We are more or less of the same generation, both from France and he wrote a far better introductory book to Python in French than mine. He also founded the French Python community (AFPY), so I always had a huge respect for the guy. And the book was appetizing.