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Stereo: Help Wanted!


Terry Duell has joined the hugin-ptx community earlier this year. He has quickly gained the reputation of a positive contributor. While learning how to use hugin he has overhauled some of the existing tutorials and devised a smart and easy way to calibrate lens parameters.

Terry has an interest in photometrology, and he unearthed a real jewel from oblivion and set up a SourceForge project for it.

Stereo was initially released under the GPL in October 1997 as part of Paul Sheer’s M.Sc. dissertation to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, South Africa. It has survived without maintainer ever since on the Italian mirror of the GRASS-GIS project, that like hugin participates in the current Google Summer of Code. There is even an old tutorial for it.

Like panorama stitching in hugin, photometrology in stereo requires control points (CP) between images. For panorama stitching the no-parallax-point (NPP) should be held in a constant position for all images. For stereo photometrology the NPP position should be controlled so that there is a known distance between each pair of images to allow for the triangulation from 2D to 3D.

Back in 1997, setting a CP was a cumbersome manual task of reading (x,y) pixel coordinates on each of the two adjacent images and adding them manually to a list. Repeat. The advent of automatic CP generation has massively simplified the task and extended the reach of stitching software to new applications such as gigapixel panoramas.

The potential is here for automatic CP generation to do the same for stereo photogrammetry and Terry needs help. Any smart and gifted coder out there that can help Terry revive stereo and bring it where no man has gone before?

If you know Paul Sheer, let him know that his child is still alive and in need of love and development.

One Response

  1. Tom Haines, PhD student at York, has developed Cyclops tools for stereo photography to “Cyclops is simply a bunch of ‘little’ tools which when combined allow you to create 3D models from photographs.” See his blog entry

    A group of students at West Virginia University are working on Stereo Gigapan, see GoogleCode
    Project Objectives: “The objective of our project is to design alternative mounts for a GigaPan[4] unit capable of acquiring stereo images as well as a methodology and software tools for analysis of these images. Additionally, the new mounts will need to use a digital trigger in order to synchronize image capture. Once this is completed, we will work with the resulting stereo images to produce anaglyphs for rough visualization and detailed point clouds for building 3D models. Point clouds can then be cleaned up in post-processing and combined with the panoramic image data to build dynamic 3D meshes that can be inspected from any angle. Possible extensions for this project include advanced interactive visualization
    techniques, interfacing with a rover for remote control, and correlating
    multiple viewpoints for more accurate models, among other things.”

    Taken from here.

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