Top all-time · #19625
Matz Johansson Bergström
Personal blog · matzjb.seprogrammingdesign
Matz Johansson Bergström writes MatzJB, a personal blog at matzjb.se about programming and design. Since 2020, 4 different Hacker News readers have linked it 4 times. The last post was in 2023, but the archive is still widely read.
Too few sampled comments (4) to say how often HN recommends it.?
Why HN links it
Commenters link this blog's posts on image redaction and frequency-domain processing: the 'swirl face' deconstruction of pixelation-based censoring, and Fourier-domain removal of halftone patterns.
Summarised by Claude from a sample of 4 HN comments that link here. Each comment is marked recommending, critical or neutral (citing without judging); how this works.
Relax, I did the research
Most-linked posts?
- /2015/07/26/deconstructing-swirl-face/2 people · 2 mentions · first linked 2022-02-16
What Hacker News says?
See also: https://matzjb.se/2015/07/26/deconstructing-swirl-face/
Comment linking /2015/07/26/deconstructing-swirl-face/
on “Don't use text pixelation to redact sensitive information”Reminds me of the "swirl face". [1] https://matzjb.se/2015/07/26/deconstructing-swirl-face/
Comment linking /2015/07/26/deconstructing-swirl-face/
on “It's easier than ever to de-censor videos”Here are a few resources for periodic pattern removal (e.g. in halftone print images) by zeroing out parts of the image in the Fourier domain. Maybe that was what you had in mind? http://matzjb.se/2015/08/08/smoothing-a-halftone-photo-using... http://scipy-lectures.org/intro/scipy/auto_examples/solution... https://developer.apple.com/documentation/accelerate/halfton... https://stackoverflow.com/questions/29235421/fi…
Comment linking /2015/08/08/smoothing-a-halftone-photo-using-fft/
on “Frequency Domain Image Compression and Filtering”Some of the more well-known examples are: Low-bitrate audio compression (MP3) use Fourier transforms. Image and video compression use Fourier transforms. Less-well-known: AC electricity has to run at (almost) exactly 60hz / 50hz. The power plants use Fourier transforms to measure the exact frequency. (And then use the measurement to adjust accordingly.) Some telecommunications techniques may use Fourier transforms:…
Comment linking /2015/08/08/smoothing-a-halftone-photo-using-fft/
on “An Interactive Guide to the Fourier Transform”