title: Video-rate or high-precision: A flexible range imaging camera

authors: Dorrington, Adrian A.

subjects: range image

abstract: A range imaging camera produces an output similar to a digital photograph, but every pixel in the image contains distance information as well as intensity. This is useful for measuring the shape, size and location of objects in a scene, hence is well suited to certain machine vision applications.
Previously we demonstrated a heterodyne range imaging system operating in a relatively high resolution (512-by-512) pixels and high precision (0.4 mm best case) configuration, but with a slow measurement rate (one every 10 s). Although this high precision range imaging is useful for some applications, the low acquisition speed is limiting in many situations. The system’s frame rate and length of acquisition is fully configurable in software, which means the measurement rate can be increased by compromising precision and image resolution. 
In this paper we demonstrate the flexibility of our range imaging system by showing examples of high precision ranging at slow acquisition speeds and video-rate ranging with reduced ranging precision and image resolution. We also show that the heterodyne approach and the use of more than four samples per beat cycle provides better linearity than the traditional homodyne quadrature detection approach. Finally, we comment on practical issues of frame rate and beat signal frequency selection.

text: Video-rate or high-precision: A flexible range imaging camera A range imaging camera produces an output similar to a digital photograph, but every pixel in the image contains distance information as well as intensity. This is useful for measuring the shape, size and location of objects in a scene, hence is well suited to certain machine vision applications.
Previously we demonstrated a heterodyne range imaging system operating in a relatively high resolution (512-by-512) pixels and high precision (0.4 mm best case) configuration, but with a slow measurement rate (one every 10 s). Although this high precision range imaging is useful for some applications, the low acquisition speed is limiting in many situations. The system’s frame rate and length of acquisition is fully configurable in software, which means the measurement rate can be increased by compromising precision and image resolution. 
In this paper we demonstrate the flexibility of our range imaging system by showing examples of high precision ranging at slow acquisition speeds and video-rate ranging with reduced ranging precision and image resolution. We also show that the heterodyne approach and the use of more than four samples per beat cycle provides better linearity than the traditional homodyne quadrature detection approach. Finally, we comment on practical issues of frame rate and beat signal frequency selection.

year: 2008

title: Spatial risk-based assessments for climate adaptation using the SimCLIM modelling system: a case study of domestic rainwater harvesting as the sole source of water

authors: Warrick, R.

subjects: adaptation

abstract: This paper describes a software modelling system, SimCLIM, for simulating the effects of climate variability and change, and demonstrates its application to domestic rainwater harvesting (RWH). The paper first describes SimCLIM and then focuses on a case study of the reliability of domestic RWH systems as the sole source of water in South East Queensland, a region of high spatial and temporal variability in rainfall. Using the SimCLIM scenario generator along with gridded daily time-series data and a domestic water tank model, 'risk landscapes' are created based on the risk of failure of the domestic systems to provide water under both current climate and scenarios of future change. Steep risk gradients were found, with major implications for RWH system configuration. Simulations are then performed in order to examine the trade-offs between two broad strategies - increasing runoff area and increasing tank size - required to maintain a reliable system. The paper concludes that, instead of set specifications, location-specific customisation of RWH systems is preferable in order to ensure reliability under current rainfall variability and sustainability over the long term under climate change. The availability of gridded daily rainfall datasets along with modelling tools like SimCLIM makes this customisation practicable.

text: Spatial risk-based assessments for climate adaptation using the SimCLIM modelling system: a case study of domestic rainwater harvesting as the sole source of water This paper describes a software modelling system, SimCLIM, for simulating the effects of climate variability and change, and demonstrates its application to domestic rainwater harvesting (RWH). The paper first describes SimCLIM and then focuses on a case study of the reliability of domestic RWH systems as the sole source of water in South East Queensland, a region of high spatial and temporal variability in rainfall. Using the SimCLIM scenario generator along with gridded daily time-series data and a domestic water tank model, 'risk landscapes' are created based on the risk of failure of the domestic systems to provide water under both current climate and scenarios of future change. Steep risk gradients were found, with major implications for RWH system configuration. Simulations are then performed in order to examine the trade-offs between two broad strategies - increasing runoff area and increasing tank size - required to maintain a reliable system. The paper concludes that, instead of set specifications, location-specific customisation of RWH systems is preferable in order to ensure reliability under current rainfall variability and sustainability over the long term under climate change. The availability of gridded daily rainfall datasets along with modelling tools like SimCLIM makes this customisation practicable.

year: 2012

title: The baskets of knowledge: A curriculum for an indigenous psychology

authors: Waitoki, Waikaremoana

abstract: Through the chapters in this book we have walked alongside Ripeka and her whānau. We have taken a journey into potentiality; that of Ripeka’s as well as our own. Our introduction to this book asked what would happen when we witnessed Ripeka through our eyes as a Māori psychologist, when diverse and multi-layered cultural contexts form our starting point. What would happen when we understood the interconnectedness of whakapapa, and tikanga to Ripeka’s past, present and future and how they could be used to guide pathways forward? We asked what would happen when we viewed Ripeka and her whānau through a lens of unrelenting hope and unrealised potential. If all those things happened, what value are we able to add as Māori psychologists to Ripeka’s life, and to that of her whānau?

text: The baskets of knowledge: A curriculum for an indigenous psychology Through the chapters in this book we have walked alongside Ripeka and her whānau. We have taken a journey into potentiality; that of Ripeka’s as well as our own. Our introduction to this book asked what would happen when we witnessed Ripeka through our eyes as a Māori psychologist, when diverse and multi-layered cultural contexts form our starting point. What would happen when we understood the interconnectedness of whakapapa, and tikanga to Ripeka’s past, present and future and how they could be used to guide pathways forward? We asked what would happen when we viewed Ripeka and her whānau through a lens of unrelenting hope and unrealised potential. If all those things happened, what value are we able to add as Māori psychologists to Ripeka’s life, and to that of her whānau?

year: 2016