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A framework for quantifying properties of 3-dimensional movement-based signals 被引量:2

A framework for quantifying properties of 3-dimensional movement-based signals
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摘要 Understanding how signal properties are optimized for the reliable transmission of information requires accurate de- scription of the signal in time and space. For movement-based signals where movement is restricted to a single plane, measure- ments from a single viewpoint can be used to consider a range of viewing positions based on simple geometric calculations. However, considerations of signal properties from a range of viewing positions for movements extending into three-dimensions (3D) are more problematic. We present here a new framework that overcomes this limitation, and enables us to quantify the extent to which movement-based signals are view-specific. To illustrate its application, a Jacky lizard tail flick signal was filmed with synchronized cameras and the position of the tail tip digitized for both recordings. Camera aligmnent enabled tl^e construction of a 3D display action pattern profile. We analyzed the profile directly and used it to create a detailed 3D animation. In the virtual environment, we were able to film the same signal from multiple viewing positions and using a computational motion analysis algorithm (gradient detector model) to measure local image velocity in order to predict view dependent differences in signal properties. This approach will enable consideration of a range of questions concerning movement-based signal design and evolu- tion that were previously out of reach [Current Zoology 56 (3): 327-336, 2010].
出处 《Current Zoology》 SCIE CAS CSCD 北大核心 2010年第3期327-336,共10页 动物学报(英文版)
关键词 Signal evolution Sensory Ecology Movement-based signal 3D Display Action Pattern 信号特性 三维运动 框架 量化 几何计算 属性依赖 信息传输 变动范围
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