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Mechanism underlying the perception of shape and material properties of light transmitting objects

透光物体形状和材料特性感知的机制

基本信息

批准号：
236221963
负责人：
Dr. Franz Faul
金额：
--
依托单位：
Institut für Psychologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/236221963?language=en
关键词：
Mechanism underlying perception shape material

项目摘要

In the project we aim to investigate several aspects of material and shape perception of light transmitting objects. The first two of four sub-projects focus on the perceived transmittance properties of thin planar transparent layers. In this work we refer to the filter model of perceived transparency proposed by Faul and Ekroll (2002, 2011). The goal of the first sub-project is to improve, extend and validate a parameter space for this model that we have recently developed. The dimensions of this space are approximately perceptually independent and perceptually uniform. These properties makes it well suited to intuitively manipulate, describe and predict the perceived properties of transparent layers. In the second sub-project we study constancy of the perceived layer transmittance under changes in the color of the illuminant. As potential influences on the degree of constancy we consider the structure of the background, color adaptation, the recognizability of an illumination change, and the subjects' task. The focus of the other two sub-projects is on the perception of realistic three-dimensional transparent objects. Specular reflections and background distortions that are clearly visible in such objects provide additional sources of information that may be used to infer the objects' properties. In the third sub-project we investigate, whether this information can be used to infer the refractive index of the objects' material. In theory, this seems possible because both the strength of specular reflections and the degree of background distortion increase with the refractive index. Our previous experiments with static distortion patterns led to negative results. In this sub-project we will test, whether changes in the distortion pattern caused by object motion relative to the scene and/or the observer can be used to estimate the refractive index. In addition we also consider the strength of specular reflection and the pattern of total reflections as potential cues for the refractive index. In a fourth sub-project we study 3D-shape perception in the special case of light-transmitting objects. The results that we obtained so far indicate that in this case shape perception relies on different cues and is often less accurate than in the case of opaque objects. A goal of this sub-project is to quantify how the accuracy and precision of shape recognition depends on the properties of the scene and the target object. Furthermore, we will try to identify regularities in the retinal image that are used by the visual system to recognize the shape of light transmitting objects.

在这个项目中，我们的目标是研究材料和形状感知的光传输对象的几个方面。前两个四个子项目集中在薄平面透明层的感知透射率特性。在这项工作中，我们参考了Faul和Ekroll（2002，2011）提出的感知透明度的过滤器模型。第一个子项目的目标是改进，扩展和验证我们最近开发的这个模型的参数空间。这个空间的维度在感知上是近似独立的，在感知上是均匀的。这些特性使其非常适合直观地操纵，描述和预测透明层的感知特性。在第二个子项目中，我们研究了在光源颜色变化下的感知层透射率的恒定性。作为恒常度的潜在影响，我们考虑背景的结构，颜色适应，照明变化的可识别性，以及受试者的任务。另外两个子项目的重点是对真实三维透明物体的感知。在这样的对象中清晰可见的镜面反射和背景失真提供了可以用于推断对象的属性的附加信息源。在第三个子项目中，我们研究了这些信息是否可以用来推断物体材料的折射率。从理论上讲，这似乎是可能的，因为镜面反射的强度和背景失真的程度都随着折射率的增加而增加。我们以前的静态失真模式实验导致了负面的结果。在这个子项目中，我们将测试，是否在失真模式的变化所造成的物体运动相对于场景和/或观察者可以用来估计折射率。此外，我们还考虑了镜面反射的强度和全反射的图案作为折射率的潜在线索。在第四子项目中，我们研究了透光物体的特殊情况下的3D形状感知。到目前为止，我们获得的结果表明，在这种情况下，形状感知依赖于不同的线索，往往不如不透明物体的情况下准确。这个子项目的目标是量化形状识别的准确性和精度如何取决于场景和目标对象的属性。此外，我们将尝试识别视网膜图像中的视觉系统用来识别透光物体形状的视网膜图像。