title: Adaptive Vision Based Scene Registration for Outdoor Augmented Reality

authors: Catchpole, Jason James

subjects: computer vision

abstract: Augmented Reality (AR) involves adding virtual content into real scenes. Scenes are viewed using a Head-Mounted Display or other display type. In
order to place content into the user's view of a scene, the user's position and orientation relative to the scene, commonly referred to as their pose, must be determined accurately. This allows the objects to be placed in the correct positions and to remain there when the user moves or the scene changes. It is achieved by tracking the user in relation to their environment using a variety of technology. One technology which has proven to provide accurate results is computer vision. Computer vision involves a computer
analysing images and achieving an understanding of them. This may be locating objects such as faces in the images, or in the case of AR, determining the pose of the user.

One of the ultimate goals of AR systems is to be capable of operating under any condition. For example, a computer vision system must be robust under a range of different scene types, and under unpredictable environmental conditions due to variable illumination and weather. The majority of existing literature tests algorithms under the assumption of ideal or 'normal' imaging conditions. To ensure robustness under as many circumstances as possible it is also important to evaluate the systems under adverse conditions.

This thesis seeks to analyse the effects that variable illumination has on computer vision algorithms. To enable this analysis, test data is required to isolate weather and illumination effects, without other factors such as changes in viewpoint that would bias the results. A new dataset is presented which also allows controlled viewpoint differences in the presence of weather and illumination changes. This is achieved by capturing video from a camera undergoing a repeatable motion sequence. Ground truth data is stored per frame allowing images from the same position under differing environmental conditions, to be easily extracted from the
videos.

An in depth analysis of six detection algorithms and five matching techniques demonstrates the impact that non-uniform illumination changes can have on vision algorithms. Specifically, shadows can degrade performance and reduce confidence in the system, decrease reliability, or even completely prevent successful operation.

An investigation into approaches to improve performance yields techniques that can help reduce the impact of shadows. A novel algorithm is presented that merges reference data captured at different times, resulting in reference data with minimal shadow effects. This can significantly improve performance and reliability when operating on images containing shadow effects. These advances improve the robustness of computer vision systems and extend the range of conditions in which they can operate. This can increase the usefulness of the algorithms and the AR systems that employ them.

text: Adaptive Vision Based Scene Registration for Outdoor Augmented Reality Augmented Reality (AR) involves adding virtual content into real scenes. Scenes are viewed using a Head-Mounted Display or other display type. In
order to place content into the user's view of a scene, the user's position and orientation relative to the scene, commonly referred to as their pose, must be determined accurately. This allows the objects to be placed in the correct positions and to remain there when the user moves or the scene changes. It is achieved by tracking the user in relation to their environment using a variety of technology. One technology which has proven to provide accurate results is computer vision. Computer vision involves a computer
analysing images and achieving an understanding of them. This may be locating objects such as faces in the images, or in the case of AR, determining the pose of the user.

One of the ultimate goals of AR systems is to be capable of operating under any condition. For example, a computer vision system must be robust under a range of different scene types, and under unpredictable environmental conditions due to variable illumination and weather. The majority of existing literature tests algorithms under the assumption of ideal or 'normal' imaging conditions. To ensure robustness under as many circumstances as possible it is also important to evaluate the systems under adverse conditions.

This thesis seeks to analyse the effects that variable illumination has on computer vision algorithms. To enable this analysis, test data is required to isolate weather and illumination effects, without other factors such as changes in viewpoint that would bias the results. A new dataset is presented which also allows controlled viewpoint differences in the presence of weather and illumination changes. This is achieved by capturing video from a camera undergoing a repeatable motion sequence. Ground truth data is stored per frame allowing images from the same position under differing environmental conditions, to be easily extracted from the
videos.

An in depth analysis of six detection algorithms and five matching techniques demonstrates the impact that non-uniform illumination changes can have on vision algorithms. Specifically, shadows can degrade performance and reduce confidence in the system, decrease reliability, or even completely prevent successful operation.

An investigation into approaches to improve performance yields techniques that can help reduce the impact of shadows. A novel algorithm is presented that merges reference data captured at different times, resulting in reference data with minimal shadow effects. This can significantly improve performance and reliability when operating on images containing shadow effects. These advances improve the robustness of computer vision systems and extend the range of conditions in which they can operate. This can increase the usefulness of the algorithms and the AR systems that employ them.

year: 2008

title: The social work regulation project in Aotearoa New Zealand

authors: Hunt, Sonya

subjects: social work regulation

abstract: INTRODUCTION: In this second of two articles on the history of professionalisation of social work in Aotearoa New Zealand, consideration is given to the more recent coalescing of forces from the 1990s to the initial implementation of the Social Workers Registration Act (2003), which led to our country’s example of a social work regulation project. 
APPROACH: This critical consideration of social work regulation in Aotearoa New Zealand situates it within the international social work professionalisation context alongside the national context. Consideration is given to the place of leadership and buy-in from the profession, political sponsorship, cultural considerations, and another ministerial review. Overlaying this, an examination of concepts of public trust, respect, and confidence in professions such as social work, are linked to crises of trust in professions in general, and placed within the current neoliberal, market-driven environment in which this project is anchored. 
CONCLUSION: The literature serves to document the history of social work regulation in Aotearoa New Zealand and as background for an ongoing research project which aims to uncover interests at work and interrogate the legitimacy of those interests, while enabling the voices of key actors from the time to surface, be explored, and be recorded.

text: The social work regulation project in Aotearoa New Zealand INTRODUCTION: In this second of two articles on the history of professionalisation of social work in Aotearoa New Zealand, consideration is given to the more recent coalescing of forces from the 1990s to the initial implementation of the Social Workers Registration Act (2003), which led to our country’s example of a social work regulation project. 
APPROACH: This critical consideration of social work regulation in Aotearoa New Zealand situates it within the international social work professionalisation context alongside the national context. Consideration is given to the place of leadership and buy-in from the profession, political sponsorship, cultural considerations, and another ministerial review. Overlaying this, an examination of concepts of public trust, respect, and confidence in professions such as social work, are linked to crises of trust in professions in general, and placed within the current neoliberal, market-driven environment in which this project is anchored. 
CONCLUSION: The literature serves to document the history of social work regulation in Aotearoa New Zealand and as background for an ongoing research project which aims to uncover interests at work and interrogate the legitimacy of those interests, while enabling the voices of key actors from the time to surface, be explored, and be recorded.

year: 2017

title: Arts Festival: 'Moonwalking Backwards Into The Future: "Poi E", Music Video and Documentary'

authors: Perrott, Lisa

subjects: Art

abstract: Research presentation - an audiovisual presentation drawing upon my published research (book chapter: 'Moonwalking Backwards Into The Future: "Poi E", Music Video and Documentary'). This presentation presented a Matuaranga Maori perspective of the temporal travels of music video and documentary, framed by the concept of whakapap. This presentation took place as part of a panel of 4 presenters who represented Te Kura Toi at the Arts Festival during the University of Waikato Open Day, 2023. This was an oral presentation, which included projected slides and videos from a PPT presentation. The audience included prospective students, their teachers and family members, community members, and current students and academic staff from the University of Waikato. My presentation was documented and photographed.

text: Arts Festival: 'Moonwalking Backwards Into The Future: "Poi E", Music Video and Documentary' Research presentation - an audiovisual presentation drawing upon my published research (book chapter: 'Moonwalking Backwards Into The Future: "Poi E", Music Video and Documentary'). This presentation presented a Matuaranga Maori perspective of the temporal travels of music video and documentary, framed by the concept of whakapap. This presentation took place as part of a panel of 4 presenters who represented Te Kura Toi at the Arts Festival during the University of Waikato Open Day, 2023. This was an oral presentation, which included projected slides and videos from a PPT presentation. The audience included prospective students, their teachers and family members, community members, and current students and academic staff from the University of Waikato. My presentation was documented and photographed.

year: 2023-05-26