title: Time-of-flight range image measurement in the presence of transverse motion using the Kalman filter

authors: Streeter, Lee

subjects: Science & Technology

abstract: Time-of-flight range imaging cameras measure distance to objects in their field of view, but are prone to error when objects move. At least three raw frames are required to obtain one range image, and the standard method is to read out raw frames into separate sets and process to find one range image per set. Motion during the acquisition of a set causes error in the corresponding range image. In this paper, the problem of motion is addressed by regarding the raw data from each pixel as a noisy time series, and using the Kalman filter to efficiently perform time-series analysis. The proposed method adapts to the effects of transverse motion, measuring a sharp range image at each raw frame. The error in the proposed method is less than the traditional approach in 80% of tests, with no detected increase in the STD due to noise. In the qualitative experimental results, the visible blur is reduced.

text: Time-of-flight range image measurement in the presence of transverse motion using the Kalman filter Time-of-flight range imaging cameras measure distance to objects in their field of view, but are prone to error when objects move. At least three raw frames are required to obtain one range image, and the standard method is to read out raw frames into separate sets and process to find one range image per set. Motion during the acquisition of a set causes error in the corresponding range image. In this paper, the problem of motion is addressed by regarding the raw data from each pixel as a noisy time series, and using the Kalman filter to efficiently perform time-series analysis. The proposed method adapts to the effects of transverse motion, measuring a sharp range image at each raw frame. The error in the proposed method is less than the traditional approach in 80% of tests, with no detected increase in the STD due to noise. In the qualitative experimental results, the visible blur is reduced.

year: 2018

title: Wellbeing for children with a disability in New Zealand: A search for meaning by Maree Kirk

authors: Kirk, Maree Louise

subjects: children with disability

abstract: This thesis explores the meaning of wellbeing for children with a disability in New Zealand, an area of social policy that has been largely unexamined. Focusing on the school environment, three questions are addressed: What does wellbeing mean for children with a disability? What factors influence it? Are current policy frameworks which address child wellbeing relevant to the wellbeing of children with a disability? The research involved qualitative data collection from nine purposively selected participants: children with a disability, their parents and key informants involved in service provision and policy development. 
A critical review of international and national literature on definitions of wellbeing and disability, and on existing data sources, is followed by a socio-demographic profile of children with a disability in New Zealand. Qualitative findings are interpreted in relation to current New Zealand social policy initiatives and frameworks - New Zealand's Agenda for Children, the Whole Child Approach and the Key Settings Model - as well as the theoretical perspectives of social solidarity, wellbeing, the ecological theory of human development and discourses of disability.
Findings indicate that the concept of wellbeing as applied to all New Zealand children is also relevant to children with a disability. The difference however, lies in the factors which ultimately influence whether the various dimensions of wellbeing will actually be experienced by children with a disability. For these children, communication as a dimension of wellbeing for example, is influenced by language skill acquisition, which in turn depends upon allocation of appropriate and adequate resourcing of the child's learning environment. 
The conclusion drawn is that policy frameworks, principles and social indicators addressing child wellbeing, are inconsistently applied with regard to children with a disability. New Zealand's Agenda for Children which promotes an ecological approach to child wellbeing would benefit from further adaptation to reflect the needs of this specific child population. The notion of wellbeing for children with a disability needs further development for the purpose of knowledge building, and to ensure clearer articulation between processes of policy development, service provision, and resource allocation.

text: Wellbeing for children with a disability in New Zealand: A search for meaning by Maree Kirk This thesis explores the meaning of wellbeing for children with a disability in New Zealand, an area of social policy that has been largely unexamined. Focusing on the school environment, three questions are addressed: What does wellbeing mean for children with a disability? What factors influence it? Are current policy frameworks which address child wellbeing relevant to the wellbeing of children with a disability? The research involved qualitative data collection from nine purposively selected participants: children with a disability, their parents and key informants involved in service provision and policy development. 
A critical review of international and national literature on definitions of wellbeing and disability, and on existing data sources, is followed by a socio-demographic profile of children with a disability in New Zealand. Qualitative findings are interpreted in relation to current New Zealand social policy initiatives and frameworks - New Zealand's Agenda for Children, the Whole Child Approach and the Key Settings Model - as well as the theoretical perspectives of social solidarity, wellbeing, the ecological theory of human development and discourses of disability.
Findings indicate that the concept of wellbeing as applied to all New Zealand children is also relevant to children with a disability. The difference however, lies in the factors which ultimately influence whether the various dimensions of wellbeing will actually be experienced by children with a disability. For these children, communication as a dimension of wellbeing for example, is influenced by language skill acquisition, which in turn depends upon allocation of appropriate and adequate resourcing of the child's learning environment. 
The conclusion drawn is that policy frameworks, principles and social indicators addressing child wellbeing, are inconsistently applied with regard to children with a disability. New Zealand's Agenda for Children which promotes an ecological approach to child wellbeing would benefit from further adaptation to reflect the needs of this specific child population. The notion of wellbeing for children with a disability needs further development for the purpose of knowledge building, and to ensure clearer articulation between processes of policy development, service provision, and resource allocation.

year: 2006

title: Walking into the past to explore the future: Utulizing larval densities to measure the effects of two climate change factors, temperature and salinity on Poorohe (common smelt, Retropinna retropinna) abundance in Te Puuaha o Waikato

authors: Robcke, Sidney

subjects: Common smelt

abstract: Poorohe (common smelt, Retropinna retropinna) are a highly valued kai species in Te Puuaha o Waikato (the lower 66 km of the Waikato River). Fisher whaanau have observed changes in the amount Poorohe that are harvested during annual fish harvests. Since Poorohe are particularly vulnerable to environmental changes, whaanau are particularly concerned about the how climate change might impact Poorohe populations. Climate change vulnerability assessments (CCVA) currently exist for several native New Zealand fish freshwater species; however, one does not yet exist for Poorohe. Previous larval distribution studies in the lower Waikato River only sampled as far downstream as Tuakau bridge (approximately 45km from the river mouth). These studies indicated that important spawning habitats likely existed downstream of Tuakau bridge. Temperature increases and saltwater intrusion have been identified as two climate change factors that will likely impact Poorohe in Te Puuaha o Waikato, because ambient temperatures have increased since the industrial revolution and the proximity of the study area to the ocean. A literature review was used to explore the experiences of fisher whaanau through the past, present and how the experiences will continue to change in a changing climate. The effects of temperature and saltwater intrusion on Poorohe populations were explored through replicating the methods of past research carried out in the 1980s and 2010s. Current river temperatures are in the optimal temperature range (12°C - 18°C) for Poorohe spawning. The saltwater wedge was suppressed by the high river flow during the eight-week sampling period, and it is unclear whether saltwater intrusion has an impact on Poorohe spawning. Larval densities did not significantly increase down river, which suggests large spawning habitat is not found downstream of Tuakau bridge. Furthermore, there were no decreases in larval densities in the two saltwater sites. This study has contributed to the available literature necessary to develop a CCVA for Poorohe and explored the cultural heritage of traditionally significant practices in Te Puuaha o Waikato relating to Poorohe.

text: Walking into the past to explore the future: Utulizing larval densities to measure the effects of two climate change factors, temperature and salinity on Poorohe (common smelt, Retropinna retropinna) abundance in Te Puuaha o Waikato Poorohe (common smelt, Retropinna retropinna) are a highly valued kai species in Te Puuaha o Waikato (the lower 66 km of the Waikato River). Fisher whaanau have observed changes in the amount Poorohe that are harvested during annual fish harvests. Since Poorohe are particularly vulnerable to environmental changes, whaanau are particularly concerned about the how climate change might impact Poorohe populations. Climate change vulnerability assessments (CCVA) currently exist for several native New Zealand fish freshwater species; however, one does not yet exist for Poorohe. Previous larval distribution studies in the lower Waikato River only sampled as far downstream as Tuakau bridge (approximately 45km from the river mouth). These studies indicated that important spawning habitats likely existed downstream of Tuakau bridge. Temperature increases and saltwater intrusion have been identified as two climate change factors that will likely impact Poorohe in Te Puuaha o Waikato, because ambient temperatures have increased since the industrial revolution and the proximity of the study area to the ocean. A literature review was used to explore the experiences of fisher whaanau through the past, present and how the experiences will continue to change in a changing climate. The effects of temperature and saltwater intrusion on Poorohe populations were explored through replicating the methods of past research carried out in the 1980s and 2010s. Current river temperatures are in the optimal temperature range (12°C - 18°C) for Poorohe spawning. The saltwater wedge was suppressed by the high river flow during the eight-week sampling period, and it is unclear whether saltwater intrusion has an impact on Poorohe spawning. Larval densities did not significantly increase down river, which suggests large spawning habitat is not found downstream of Tuakau bridge. Furthermore, there were no decreases in larval densities in the two saltwater sites. This study has contributed to the available literature necessary to develop a CCVA for Poorohe and explored the cultural heritage of traditionally significant practices in Te Puuaha o Waikato relating to Poorohe.

year: 2024-11-23