Modulating Fine Roughness Perception of Vibrotactile Textured Surface using Pseudo-haptic Effect
Modulating Fine Roughness Perception of Vibrotactile Textured Surface using Pseudo-haptic Effect
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DOI：
10.1109/tvcg.2019.2898820
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发表时间：
2019-05-01
影响因子：
5.2
通讯作者：
Hirota, Koichi
中科院分区：
文献类型：
--
作者：
Ujitoko, Yusuke;Ban, Yuji;Hirota, Koichi
通过致动器回放振动触觉信号通常用于模拟虚拟纹理表面的触觉感觉。然而，在触觉设计者的模拟触觉感觉和预期触觉感觉之间经常存在小的不匹配。因此，需要一种调节振动触觉感知的方法。我们专注于精细粗糙度的感知，我们提出了一种方法，使用伪触觉效果来调制精细粗糙度感知的振动触觉纹理。具体来说，我们在视觉上稍微修改了指针在屏幕上的位置，这表明了纹理表面上的触摸位置。我们假设，如果用户收到振动反馈，观察指针在视觉上前后和左右摆动，用户会认为振动触觉表面更不均匀。我们还假设，随着视觉振荡的大小越来越大，振动触觉表面的粗糙度感知的修改量会更大。我们进行了用户研究来测试假设。第一个用户研究的结果表明，用户觉得振动触觉纹理与我们的方法粗糙比他们没有我们的方法在一个高的概率。第二个用户研究的结果表明，用户感受到不同的粗糙度振动纹理的视觉振荡的大小。这些结果证实了我们的假设，他们建议我们的方法是有效的。此外，当用户使用他们的手与虚拟表面交互时，相同的效果可以潜在地应用于虚拟手或指尖的视觉移动。
Playing back vibrotactile signals through actuators is commonly used to simulate tactile feelings of virtual textured surfaces. However, there is often a small mismatch between the simulated tactile feelings and intended tactile feelings by tactile designers. Thus, a method of modulating the vibrotactile perception is required. We focus on fine roughness perception and we propose a method using a pseudo-haptic effect to modulate fine roughness perception of vibrotactile texture. Specifically, we visually modify the pointer's position on the screen slightly, which indicates the touch position on textured surfaces. We hypothesized that if users receive vibrational feedback watching the pointer visually oscillating back/forth and left/right, users would believe the vibrotactile surfaces more uneven. We also hypothesized that as the size of visual oscillation is getting larger, the amount of modification of roughness perception of vibrotactile surfaces would be larger. We conducted user studies to test the hypotheses. Results of first user study suggested that users felt vibrotactile texture with our method rougher than they did without our method at a high probability. Results of second user study suggested that users felt different roughness for vibrational texture in response to the size of visual oscillation. These results confirmed our hypotheses and they suggested that our method was effective. Also, the same effect could potentially be applied to the visual movement of virtual hands or fingertips when users are interacting with virtual surfaces using their hands.