mpr projects

mpr projects

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  • Stereo Vision with two RPi Cameras

    Stereo Vision with two RPi Cameras

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    Semi-Global Matching is an algorithm that’s commonly used in Stereo Vision and also in Multi-View Stereo (e.g. when doing 3D-Reconstructions). To know more about it I first read Mr Hirschmüller’s paper that introduced SGM. Then I got two Raspberry Pi Camera Modules v3 and hooked them up to a Raspberry Pi 5, calibrated everything and…

  • Automating 3D Reconstructions: First Milestone [Video]

    Automating 3D Reconstructions: First Milestone [Video]

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    After a lot of work I’ve finally got a working prototype for automating 3d-reconstructions with photogrammetry. Obviously the hardware is not built professionally but by me, and I’m more of a theory/software person. So I’m not using an industrial computer vision camera but a camera for photographers (X-T2), the parts for moving the camera are…

  • 3D Reconstruction: Introduction to Meshroom [Video]

    3D Reconstruction: Introduction to Meshroom [Video]

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    This is the third video in the series about 3D Reconstructions and in this video we’ll discuss the first half of Meshroom’s pipeline, we’ll talk about CCTags for automatic scaling, and we’ll talk about what changes when we use a Turntable. Finally, we’ll have a look at using known camera positions to improve the reliability…

  • 3D-Reconstruction: Building a small, simple Turntable [Video]

    3D-Reconstruction: Building a small, simple Turntable [Video]

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    In this video we’re building a small and simple turntable that we can use to take photos of an object in regular intervals. By combining the turntable with gphoto2 most of the process happens automatically. This is the second post in a series about 3D Reconstructions. The first post gave an overview of what we’re…

  • 3D Reconstruction: Intro and Image Acquisition [Video]

    3D Reconstruction: Intro and Image Acquisition [Video]

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    This is the first video of a series about 3D Reconstructions. We’ll use the open-source Photogrammetry program Meshroom and a home-built machine to take pictures of an object in regular intervals. Over the entire series we’ll look at and test which factors affect the quality of our reconstruction. I’ve found 3D reconstructions fascinating for a…

  • Building a DIY Spectroscope [Video]

    Building a DIY Spectroscope [Video]

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    In this post we’ll use a camera, an analogue pocket spectroscope and some software that I wrote to build a digital spectroscope. The spectroscope will be limited to roughly the visible range of light (~400nm to ~700nm). While it’s probably not as accurate as commercial devices we will calibrate it carefully to give decent results.

  • Mono-Conversion of a Canon 350D [Video]

    Mono-Conversion of a Canon 350D [Video]

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    In this video we disassemble a Canon 350D and we remove the top layer of the sensor, which includes the colour filter array. As a result we’ll end up with a monochrome camera. We also discuss auto focus calibration and a few related topics.

  • RPi NAS: Borg Backup

    RPi NAS: Borg Backup

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    In this post we’re going to use the software packages Borg Backup and Borgmatic to do system backups of both our Raspberry Pi and our main computer. We’ll also schedule automatic backups using both cron and systemd.

  • Building a Raspberry Pi NAS with Data Redundancy: Part 1 Overview

    Building a Raspberry Pi NAS with Data Redundancy: Part 1 Overview

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    In this series of posts we’ll use a Raspberry Pi to build a simple, fast and affordable network-attached storage (NAS) that’s suitable for home use. Multiple copies of our data will be saved so nothing is lost when a hard drive fails. On the way we’ll also look at various important and interesting topics that…