Biomechatronics Group, Faculty of Engineering and Mathematics, University of Applied Sciences, Bielefeld, Germany.
Active Sensing, Faculty of Biology, Bielefeld University, Bielefeld, Germany.
Bioinspir Biomim. 2021 Dec 22;17(1). doi: 10.1088/1748-3190/ac3215.
Parallax, as a visual effect, is used for depth perception of objects. But is there also the effect of parallax in the context of electric field imagery? In this work, the example of weakly electric fish is used to investigate how the self-generated electric field that these fish utilize for orientation and communication alike, may be used as a template to define electric parallax. The skin of the electric fish possesses a vast amount of electroreceptors that detect the self-emitted dipole-like electric field. In this work, the weakly electric fish is abstracted as an electric dipole with a sensor line in between the two emitters. With an analytical description of the object distortion for a uniform electric field, the distortion in a dipole-like field is simplified and simulated. On the basis of this simulation, the parallax effect could be demonstrated in electric field images i.e. by closer inspection of voltage profiles on the sensor line. Therefore, electric parallax can be defined as the relative movement of a signal feature of the voltage profile (here, the maximum or peak of the voltage profile) that travels along the sensor line peak trace (PT). The PT width correlates with the object's vertical distance to the sensor line, as close objects create a large PT and distant objects a small PT, comparable with the effect of visual motion parallax.
视差是一种用于感知物体深度的视觉效果。那么在电场图像的背景下，是否也存在视差效应呢？在这项工作中，我们以弱电鱼为例，研究这些鱼用于定位和通讯的自身产生的电场如何可以用作定义电视差的模板。电鱼的皮肤拥有大量的感受器，可以检测到自身发出的偶极子样电场。在这项工作中，弱电鱼被抽象为一个电偶极子，两个发射器之间有一个传感器线。通过对均匀电场中物体变形的分析描述，简化并模拟了偶极子场中的变形。基于这个模拟，我们可以在电场图像中展示视差效应，例如，通过更仔细地检查传感器线上的电压分布。因此，电视差可以定义为沿着传感器线峰值轨迹（PT）移动的电压分布信号特征（这里是电压分布的最大值或峰值）的相对运动。PT 宽度与物体到传感器线的垂直距离相关，因为近距离物体产生大的 PT，远距离物体产生小的 PT，这与视觉运动视差的效果相当。
