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Visual SfM: 3D Construction through Structure from Motion

blog header with text Visual sfm

From reviewing the paper The Untapped Potential of Low Cost Photogrammery in Community-Based Archaeology, it was easy to see that photogrammetry can be used as an alternative to high resolution surveying with high costs.

Traditional softcopy photogrammetric methods require the 3-D location and pose of the camera(s), or the 3-D location of ground control points to be known to facilitate scene triangulation and reconstruction. In contrast, the SfM method solves the camera pose and scene geometry simultaneously and automatically, using a highly redundant bundle adjustment based on matching features in multiple overlapping, offset images [Westoby et al 2012].

Structure from motion is the geometry of creating 3D models from 2D images. If you are interested in the maths behind SfM, visit Prof. Rob Fergus’s lecture notes on Computer Vision, or geometric vision, in particular Lecture 6 on Multiview Stereo & Structure from Motion.  It is quite interesting to see the process. Thankfully, to Wu Changchang, we don’t need to understand the mathematics behind how Structure from Motion works, to be able to use it. In his post-doc year at University of Washington Seattle, he developed Visual SfM.

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Review: Toward Virtual Community Knowledge Evolution

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image of a network using ludo pieces

Note: In looking for articles to read, to understand better the mechanics and possibilities of digital technologies that can improve communities both online and offline, I came across this paper, ‘Toward Virtual Community Knowledge Evolution’. Published in 2002, and with the extraordinary rate at which digital technologies change, it seems outdated. However I see it as a classic. The beginning of the road towards collaborative technological advances, and the real value of digital technologies. It was a vision for the future, for digital technology to facilitate knowledge, which meant devising new systems, that would engage and enable users in digital literacies associated within their virtual community. A lot of these features we now take for granted, such as hyperlinks, but in studying the classics, we can realise the excitement as these new systems were developed by people, for people.

Introduction

          Toward Virtual Community Knowledge Evolution is a study carried out by a nine academics, Michael Bieber, Douglas Englebart, Richard Furuta, Starr Roxanne Hiltz, John Noll, Jennifer Preece, Edward A. Stohr, Murray Turoff and Bartel Van De Walle, who lecture in a range of universities, all working and excelling in their areas of computer science and information systems. In this paper, they propose the building of a ‘multimedia document repository’ or digital library, which has unique innovate supports which validates knowledge evolution. A series of tools and technologies based around the concept of community knowledge that can be build-on collectively, to constantly improve the workings of the system. This system, or Collaborative Knowledge Evolution Support System (CKESS), would provide a workflow that can be developed and upgraded through its users; the members who make up the virtual community.

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Review: The Untapped Potential of Low-Cost Photogrammetry in Community-Based Archaeology

2 images about the Inuit community Canada

          The Untapped Potential of Low-Cost Photogrammetry in Community-Based Archaeology: A Case Study from Banks Island, Arctic Canada, is a paper that was printed in the Journal of Community Archaeology & Heritage, in April 2016. Written by Colleen Haukaas and Lisa M. Hodgetts, this research paper is a case study from an archaeological project they undertook in Banks Island, Canada. It bears a striking resemblance to the Ogham in 3D project, in that it is a community orientated archaeological project, using photogrammetry and structure from motion techniques, and similar software for translating the data into 3D models.

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Photogrammetry Timeline

blog header history of photogrammetry

As part of my research into digital tools and community participation, I have been looking at photogrammetry. In particular because I will be using it as part of the Ogham in 3D project. I realised how little I knew about the history of photogrammetry, and wanted to delve in deeper. As a visual learner, I find just reading articles and papers, still don’t quite connect the dots for me, and constantly find myself muddled with dates and names. So, I decided to create a visual (brief) timeline of the history of photogrammetry, to get a better idea of its origins, its uses, and significance today.

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Burnham House

Image with 3D ogham stone and the text Ogham in 3D

I’ve finally begun the Ogham in 3D Mapping Project, (see previous post here). I have been assigned to map the Ogham Stones at Cólaiste Íde/Burnham House.

Burnham House, is a detached seven-bay three-storey late-Georgian house, built c. 1800. 1 Originally the estate of Lord Ventry, it is now an Irish speaking girls boarding school, Cólaste Íde. A collection of seven stones, they were though to have originally been situated at a few different sites, eg Ballinrannig; Burnham East, Ballineesteenig, and other sites, but were placed along the driveway by Lord Ventry.

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Skeuomorphic Design

sample of web browser icons

In putting together my mindmap for a social media strategy, I came across a term I had not heard of before, Skeuomorphic Design. Once I read what it meant, I realised I knew the concept, just not the term.

‘skeuomorphism’ – a design principle in which design cues are taken from the physical world. https://www.techopedia.com/definition/28955/skeuomorphism

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Create, Connect, Share!

image taken at Activism Camp 2015

I’m currently preparing for my workshop at Activism Camp next week, 1/2nd July, in Knockree Youth Hostel, Enniskerry, County Wicklow.

Run by Claiming our Future, it is an excellent opportunity to meet with like-minded individuals, network, and get a crash course in creative action for social change.

I will be giving a workshop on mindmapping a social media strategy, focusing on a ‘less is more’ approach. Through research on your community, and by creating a strategy, you can spend less time on ‘pushing’ your campaign and more time ‘pulling’, creating good content.

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Digital Storytelling

image of several faces

Digital storytelling is a short form of digital media production that allows everyday people to share aspects of their life story. The media used may include the digital equivalent of film techniques (full-motion video with sound), animation, stills or audio.

Everyone has many powerful stories to tell and people who believe they are mundane, uninteresting, or unmemorable possess beneath this mask a vivid, complex, and rich body of stories just waiting to be told”.- Center for Digital Storytelling

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Twitter Sentiment Visualization

image of twitter scrabble pieces

I recently came across an online project, that will “ estimate and visualize sentiment for short, incomplete text snippet”.  Tweet Sentiment Visualization presents a visualization of basic emotional properties in a text. Focusing on Twitter, you simply add in a keyword and a detailed visual analysis is created, using Russell Model of Emotional Effect 1.

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