https://www.arj.no/tags/computational/ Recent content in Computational on ARJ (English) https://www.arj.no/images/_F8A4088_doc6pg1cufjdr42ycbfd0e.jpg https://www.arj.no/images/_F8A4088_doc6pg1cufjdr42ycbfd0e.jpg Hugo -- 0.152.2 en-us Alexander Refsum Jensenius. CC-BY-SA 4.0 Sat, 16 May 2026 22:46:00 +0200 https://www.arj.no/2026/05/16/drunk-ai/ Sat, 16 May 2026 22:46:00 +0200 https://www.arj.no/2026/05/16/drunk-ai/ The 'Drunk' AI. Earlier today, I wrote about AI and photography based on an interesting panel conversation at Fotografiens Hus in Oslo. During the Q&A session. https://www.arj.no/2026/05/16/ai-photography/ Sat, 16 May 2026 18:02:00 +0200 https://www.arj.no/2026/05/16/ai-photography/ AI and photography. Today, I took part in an interesting panel conversation at Fotografiens Hus in Oslo in connection with the exhibition What We Call Real by. https://www.arj.no/2026/03/22/agent-coding-music-tools/ Sun, 22 Mar 2026 00:00:00 +0000 https://www.arj.no/2026/03/22/agent-coding-music-tools/ I have explored how GitHub Copilot agents can help create a suite of browser-based music tools (metronome, tuner, piano, and drum kit) in minutes using HTML, CSS, vanilla JavaScript, and the Web Audio API. https://www.arj.no/2026/01/04/ai-creative-history/ Sun, 04 Jan 2026 00:00:00 +0000 https://www.arj.no/2026/01/04/ai-creative-history/ The History and Future of Creative AI. Yesterday, I wrote about the history and future of AI in general. Today, I am continuing my explorations by examining. https://www.arj.no/2026/01/03/ai-history-future/ Sat, 03 Jan 2026 00:00:00 +0000 https://www.arj.no/2026/01/03/ai-history-future/ The History and Future of AI. Due to MishMash, I am nowadays lecturing on AI, music, and creativity several times a week. I usually include a brief overview of. https://www.arj.no/2025/12/31/alt-text-ai-generation/ Wed, 31 Dec 2025 00:00:00 +0000 https://www.arj.no/2025/12/31/alt-text-ai-generation/ Automating alt text generation for all blog images. Yesterday, I wrote about how I cleaned up a lot of old mess here on this blog. This made me realize that I. https://www.arj.no/2025/12/30/2025-blog-cleanup/ Tue, 30 Dec 2025 00:00:00 +0000 https://www.arj.no/2025/12/30/2025-blog-cleanup/ AI-based help with cleaning my blog. After running this blog for over two decades, it was time for some serious housekeeping. I converted from WordPress to. https://www.arj.no/2025/12/22/sensing-book/ Mon, 22 Dec 2025 00:00:00 +0000 https://www.arj.no/2025/12/22/sensing-book/ Reflections on writing a textbook with AI. This semester, I have written a book with AI. I should emphasize the with in the previous sentence, because this has. https://www.arj.no/2025/12/19/ai-realistic-photos/ Fri, 19 Dec 2025 00:00:00 +0000 https://www.arj.no/2025/12/19/ai-realistic-photos/ AI-realistic Photos. One of my MUS2640 students asked which AI tool I had used to create the illustration on top of the textbook I have been developing for the. https://www.arj.no/2025/12/19/insta360-to-equirectangular/ Fri, 19 Dec 2025 00:00:00 +0000 https://www.arj.no/2025/12/19/insta360-to-equirectangular/ Convert Insta360 .insp files to equirectangular projection on Ubuntu with FFmpeg. While writing the blog post on AI-realistic photos, I wanted to include one. https://www.arj.no/2025/07/27/2025-ai-tools/ Sun, 27 Jul 2025 00:00:00 +0000 https://www.arj.no/2025/07/27/2025-ai-tools/ My current use of AI tools for research. Over the past few weeks, I have read several newspaper articles and seen numerous social media postings from. https://www.arj.no/2025/07/26/vitruvian-analyzer/ Sat, 26 Jul 2025 00:00:00 +0000 https://www.arj.no/2025/07/26/vitruvian-analyzer/ This post introduces a script that measures key body ratios from photos, inspired by Leonardo da Vinci's Vitruvian Man, and discusses the intersection of ancient ideals with modern pose estimation technology. https://www.arj.no/2023/08/07/transparent-circles/ Mon, 07 Aug 2023 00:00:00 +0000 https://www.arj.no/2023/08/07/transparent-circles/ Making image parts transparent in Python. As part of my year-long StillStanding project, I post an average image of the spherical video recordings on Mastodon. https://www.arj.no/2022/08/09/ffmpeg-fade-in-fade-out/ Tue, 09 Aug 2022 00:00:00 +0000 https://www.arj.no/2022/08/09/ffmpeg-fade-in-fade-out/ Add fade-in and fade-out programmatically with FFmpeg. There is always a need to add fade-in and fade-out to audio tracks. Here is a way of doing it for a. https://www.arj.no/2022/07/13/ffmpeg-highpass/ Wed, 13 Jul 2022 00:00:00 +0000 https://www.arj.no/2022/07/13/ffmpeg-highpass/ Removing audio hum using a highpass filter in FFmpeg. Today, I recorded Sound Action 194 - Rolling Dice as part of my year-long sound action project. The idea. https://www.arj.no/2022/02/12/edit-video-rotation-metadata-in-ffmpeg/ Sat, 12 Feb 2022 00:00:00 +0000 https://www.arj.no/2022/02/12/edit-video-rotation-metadata-in-ffmpeg/ Edit video rotation metadata in FFmpeg. I am recording a lot of short videos these days for my sound actions project. Sometimes the recordings end up being. https://www.arj.no/2022/01/09/frame-differencing-with-ffmpeg/ Sun, 09 Jan 2022 00:00:00 +0000 https://www.arj.no/2022/01/09/frame-differencing-with-ffmpeg/ Frame differencing with FFmpeg. I often want to create motion videos, that is, videos that only show what changed between frames. Such videos are nice to look. https://www.arj.no/2021/12/21/ffmpeg-v360-processing/ Tue, 21 Dec 2021 00:00:00 +0000 https://www.arj.no/2021/12/21/ffmpeg-v360-processing/ Pre-processing Garmin VIRB 360 recordings with FFmpeg. I have previously written about how it is possible to "flatten" a Ricoh Theta+ recording using FFmpeg. https://www.arj.no/2021/12/08/ritmo-code-of-conduct-updated/ Wed, 08 Dec 2021 00:00:00 +0000 https://www.arj.no/2021/12/08/ritmo-code-of-conduct-updated/ Updated version of RITMO's code of conduct. At the first "Tour de RITMO", a retreat for the whole centre, we had a group work session that resulted in the. https://www.arj.no/2021/11/17/preparing-video-for-matlab-analysis/ Wed, 17 Nov 2021 00:00:00 +0000 https://www.arj.no/2021/11/17/preparing-video-for-matlab-analysis/ Preparing video for Matlab analysis. Typical video files, such as MP4 files with H.264 compression, are usually small in size and with high visual quality. https://www.arj.no/2021/11/13/releasing-the-musical-gestures-toolbox-for-python/ Sat, 13 Nov 2021 00:00:00 +0000 https://www.arj.no/2021/11/13/releasing-the-musical-gestures-toolbox-for-python/ Releasing the Musical Gestures Toolbox for Python. After several years in the making, we finally "released" the Musical Gestures Toolbox for Python at the. https://www.arj.no/2021/10/27/video-rotation/ Wed, 27 Oct 2021 00:00:00 +0000 https://www.arj.no/2021/10/27/video-rotation/ Rotate video using FFmpeg. Here is another FFmpeg-related blog post, this time to explain how to rotate a video using the command-line tool FFmpeg. There are. https://www.arj.no/2021/10/26/cropvideo/ Tue, 26 Oct 2021 00:00:00 +0000 https://www.arj.no/2021/10/26/cropvideo/ Crop video files with FFmpeg. I have previously written about how to trim video files with FFmpeg. It is also easy to crop a video file. Here is a short how-to. https://www.arj.no/2021/09/22/can-ai-replace-humans/ Wed, 22 Sep 2021 00:00:00 +0000 https://www.arj.no/2021/09/22/can-ai-replace-humans/ Can AI replace humans?. Or, more specifically: can AI replace an artist? That is the question posed in a short documentary that I have contributed to for this. https://www.arj.no/2021/05/11/ffmpeg-audio-video/ Tue, 11 May 2021 00:00:00 +0000 https://www.arj.no/2021/05/11/ffmpeg-audio-video/ Combining audio and video files with FFmpeg. When working with various types of video analysis, I often end up with video files without audio. So I need to add. https://www.arj.no/2021/01/24/container-conversion/ Sun, 24 Jan 2021 00:00:00 +0000 https://www.arj.no/2021/01/24/container-conversion/ Convert between video containers with FFmpeg. In my ever-growing collection of smart FFmpeg tricks, here is a way of converting from one container format to. https://www.arj.no/2021/01/02/create-timelapse-video-from-images-with-ffmpeg/ Sat, 02 Jan 2021 00:00:00 +0000 https://www.arj.no/2021/01/02/create-timelapse-video-from-images-with-ffmpeg/ Create timelapse video from images with FFmpeg. I take a lot of timelapse shots with a GoPro camera. Usually, I do this with the camera's photo setting instead. https://www.arj.no/2020/11/22/music-and-ai/ Sun, 22 Nov 2020 00:00:00 +0000 https://www.arj.no/2020/11/22/music-and-ai/ Music and AI. Last week I was interviewed about music and artificial intelligence (AI). This led to several different stories on radio, TV, and as text. The. https://www.arj.no/2020/11/06/ffmpeg-tblend/ Fri, 06 Nov 2020 00:00:00 +0000 https://www.arj.no/2020/11/06/ffmpeg-tblend/ Visual effect of the different tblend functions in FFmpeg. FFmpeg is a fantastic resource for doing all sorts of video manipulations from the terminal. https://www.arj.no/2020/03/20/pixel-array-images-of-long-videos-in-ffmpeg/ Fri, 20 Mar 2020 00:00:00 +0000 https://www.arj.no/2020/03/20/pixel-array-images-of-long-videos-in-ffmpeg/ Pixel array images of long videos in FFmpeg. Continuing my explorations of FFmpeg for video visualization, today I came across this very nice blog post on. https://www.arj.no/2020/03/15/360-flattening/ Sun, 15 Mar 2020 00:00:00 +0000 https://www.arj.no/2020/03/15/360-flattening/ Flattening Ricoh Theta 360-degree videos using FFmpeg. I am continuing my explorations of the great terminal-based video tool FFmpeg. Now I wanted to see if I. https://www.arj.no/2020/03/01/keyframe-displays-ffmpeg/ Sun, 01 Mar 2020 00:00:00 +0000 https://www.arj.no/2020/03/01/keyframe-displays-ffmpeg/ Creating different types of keyframe displays with FFmpeg. In some recent posts I have explored the creation of motiongrams and average images, multi-exposure. https://www.arj.no/2020/02/21/keyframe-displays/ Fri, 21 Feb 2020 00:00:00 +0000 https://www.arj.no/2020/02/21/keyframe-displays/ Creating multi-exposure keyframe image displays with FFmpeg and ImageMagick. While I was testing visualization of some videos from the AIST database earlier. https://www.arj.no/2019/11/03/converting-mxf-files-to-mp4-with-ffmpeg/ Sun, 03 Nov 2019 00:00:00 +0000 https://www.arj.no/2019/11/03/converting-mxf-files-to-mp4-with-ffmpeg/ Converting MXF files to MP4 with FFmpeg. We have a bunch of Canon XF105 at RITMO, a camera that records MXF files. This is not a particularly useful file. https://www.arj.no/2018/11/24/ritmo-code-of-conduct/ Sat, 24 Nov 2018 00:00:00 +0000 https://www.arj.no/2018/11/24/ritmo-code-of-conduct/ Making a code of conduct for RITMO. We had our first retreat ("Tour de RITMO") at RITMO earlier this semester and spent some time getting to know each other. https://www.arj.no/2018/09/28/mgt/ Fri, 28 Sep 2018 00:00:00 +0000 https://www.arj.no/2018/09/28/mgt/ Musical Gestures Toolbox for Matlab. Yesterday I presented the Musical Gestures Toolbox for Matlab in the late-breaking demo session at the ISMIR conference in. https://www.arj.no/2018/05/18/trimvideo/ Fri, 18 May 2018 00:00:00 +0000 https://www.arj.no/2018/05/18/trimvideo/ Trim video files using FFmpeg. This is a note to self, and hopefully others, about how to easily and quickly trim videos without recompressing the file. I. https://www.arj.no/2015/08/03/new-paper-test-retest-reliability/ Mon, 03 Aug 2015 00:00:00 +0000 https://www.arj.no/2015/08/03/new-paper-test-retest-reliability/ New paper: Test–retest reliability of computer-based video analysis of general movements in healthy term-born infants. I have for several years been Learn more. https://www.arj.no/2011/03/25/avoid-subscript-in-matlab-titles/ Fri, 25 Mar 2011 00:00:00 +0000 https://www.arj.no/2011/03/25/avoid-subscript-in-matlab-titles/ Avoid subscript in Matlab titles. I am working on some plots in Matlab, where I am using the filename as the title of the plot. In many of the files I am using. https://www.arj.no/2009/02/09/human-computer-confluence/ Mon, 09 Feb 2009 00:00:00 +0000 https://www.arj.no/2009/02/09/human-computer-confluence/ human-computer confluence. A couple of weeks ago I came across the English word confluence. The Oxford dictionary informs me that this means "the junction of. https://www.arj.no/2008/05/15/mobile-python-on-s60-to-maxmsp/ Thu, 15 May 2008 00:00:00 +0000 https://www.arj.no/2008/05/15/mobile-python-on-s60-to-maxmsp/ Mobile Python on S60 to Max/MSP. Richard Widerberg held a workshop today on using mobile python on Nokia phones running Symbian OS S60. He has gathered some. https://www.arj.no/2007/11/06/bug-labs-lego-like-computer-modules/ Tue, 06 Nov 2007 00:00:00 +0000 https://www.arj.no/2007/11/06/bug-labs-lego-like-computer-modules/ Bug Labs: Lego-like computer modules. Bug Labs has announced a new open source, Lego-like computer modules running Linux. The idea is to create hardware that. https://www.arj.no/2007/04/11/cooperating-computer-music-languages/ Wed, 11 Apr 2007 00:00:00 +0000 https://www.arj.no/2007/04/11/cooperating-computer-music-languages/ Cooperating Computer Music Languages. Brad Garton has posted an interesting blog entry about how he works with many different computer music languages from. https://www.arj.no/2006/11/03/pd-is-a-programming-language/ Fri, 03 Nov 2006 00:00:00 +0000 https://www.arj.no/2006/11/03/pd-is-a-programming-language/ Pd *is* a programming language!. Many people often question whether Max/MSP, PD and other graphical environments can be considered programming languages. https://www.arj.no/2006/09/19/myron-computer-vision-for-artists/ Tue, 19 Sep 2006 00:00:00 +0000 https://www.arj.no/2006/09/19/myron-computer-vision-for-artists/ Myron - Computer Vision for Artists. Myron is the cross-platform, cross-language, open source, video capture and computer vision plugin. One core C object gets. https://www.arj.no/2006/09/19/sequencer-programming/ Tue, 19 Sep 2006 00:00:00 +0000 https://www.arj.no/2006/09/19/sequencer-programming/ Sequencer Programming. In a Sneak Peek for OS X Leopard, Apple shows a debugging mode in Xcode that works something like music sequencers. Taking its interface. https://www.arj.no/2006/07/07/computers-getting-slower/ Fri, 07 Jul 2006 00:00:00 +0000 https://www.arj.no/2006/07/07/computers-getting-slower/ Computers getting slower.... Gordon Moore, founder of Intel, observed that computer processor complexity approximately doubled every eighteen months. This. https://www.arj.no/2006/02/02/translation/ Thu, 02 Feb 2006 00:00:00 +0000 https://www.arj.no/2006/02/02/translation/ Language and Computers. I have been using BabelFish for online translation, but I just found out about Google Translate. My small comparisons show up very. https://www.arj.no/2005/11/28/chuck-concurrent-on-the-fly-audio-programming-language/ Mon, 28 Nov 2005 00:00:00 +0000 https://www.arj.no/2005/11/28/chuck-concurrent-on-the-fly-audio-programming-language/ ChucK : Concurrent, On-the-fly Audio Programming Language. I finally got around to download and try ChucK : Concurrent, On-the-fly Audio Programming Language. https://www.arj.no/2005/09/28/computer-music-modeling-and-retrieval/ Wed, 28 Sep 2005 00:00:00 +0000 https://www.arj.no/2005/09/28/computer-music-modeling-and-retrieval/ Computer Music Modeling and Retrieval. CMMR, Pisa, Italy 26-28 September 2005 This was a rather small conference, with only about 40 participants, organised at. https://www.arj.no/2005/09/12/international-computer-music-conference/ Mon, 12 Sep 2005 00:00:00 +0000 https://www.arj.no/2005/09/12/international-computer-music-conference/ International Computer Music Conference. Some notes from ICMC, Barcelona, Spain 4-10 September 2005. Sunday 4 September I attended a workshop on audio.