Tag Archives: programming

Using JAX, numpy, and optimization techniques to improve separable image filters

Posted on March 15, 2020 by bartwronski

In today’s blog post I will look at two topics: how to use JAX (“hyped” new Python ML / autodifferentiation library), and a basic application that is follow-up to my previous blog post on using SVD for low-rank approximations and … Continue reading →

Posted in Code / Graphics | Tagged bokeh, colab, github, graphics programming, image processing, jax, maths, numpy, postprocessing, programming, python | 4 Comments

Analyze your own activity data using Google Takeout – music listening stats example

Posted on January 6, 2020 by bartwronski

The goal of this post is to show how to download our own data stored and used by internet services to generate personalized stats / charts like below and will show step-by-step how to do it using colab, Python, pandas, … Continue reading →

Posted in Code / Graphics | Tagged colab, data, numpy, programming, python, statistics, visualization | Leave a comment

How (not) to test graphics algorithms

Posted on August 14, 2019 by bartwronski

Intro Siggraph 2019 is sadly over, but as always I came back super inspired and grateful for meeting many friends. Conferences are mostly not about seeing the presentations – but about all the interesting and inspiring discussions, and one of … Continue reading →

Posted in Code / Graphics | Tagged code design, code style, graphics, graphics programming, programming, siggraph, testing, tests | 2 Comments

Cull that cone! Improved cone/spotlight visibility tests for tiled and clustered lighting

Posted on April 13, 2017 by bartwronski

In this blog post, I will present some common spotlight culling techniques and propose one small improvement that is able to correct results of cheap, tiled / clustered culling on the CPU/GPU with almost negligible ALU cost. If you know … Continue reading →

Posted in Code / Graphics | Tagged cone, culling, geometry, graphics, ideas, lighting, mathematica, mathematics, occlussion, programming, sphere, spot, visibility | 9 Comments

Small float formats – R11G11B10F precision

Posted on April 2, 2017 by bartwronski

While this post is not yet dithering related, it is in a way a part of my series about dithering. You can check index of all parts here or check the previous part. I will talk here about use of … Continue reading →

Posted in Code / Graphics | Tagged float, floating point, floats, graphics, mathematica, mathematics, noise, programming, quantization, rendering | 6 Comments

Dithering part three – real world 2D quantization dithering

Posted on October 30, 2016 by bartwronski

In previous two parts of this blog post mini-series I described basic uses mentioned blue noise definition, referenced/presented 2 techniques of generating blue noise and one of many general purpose high-frequency low-discrepancy sampling sequences. In this post, we will look … Continue reading →

Posted in Code / Graphics | Tagged bayer, blue noise, dithering, fourier, graphics, graphics programming, interleaved gradient noise, mathematica, mathematics, maths, noise, programming, sampling | 5 Comments

Dithering part two – golden ratio sequence, blue noise and highpass-and-remap

Posted on October 30, 2016 by bartwronski

In previous part of the mini-series I covered dithering definition and how dithering changes error characteristics of simple 1D quantization and functions. In this part I will try to look at what blue noise is, but first wanted to have a … Continue reading →

Posted in Code / Graphics | Tagged blue noise, dithering, golden ratio, graphics, graphics programming, low discrepancy, noise, programming | 9 Comments