The special event in IDW '19 offers demonstrations of leading-edge technologies and art works on sensory illusion. You can experience 11 demonstrations: 2 of them will be presented in Special Talks and 4 of them will be presented in 3D4/VHF4/3DSA4 and INP4 sessions.
Date & Place
Special Talks: November 27 , 2019 (Mid-sized Hall A) Exhibitions: November 27-29, 2019 (Main Hall)
Wednesday, November 27 18:30-19:10 Mid-sized Hall A
1. A variety of visual illusions
Akiyoshi Kitaoka, Ritsumeikan University, Japan
Visual illusion or optical illusion refers to illusion in vision or misperception of visual images. A variety of visual illusions are known. Trompel'oeil is sometimes included in visual illusion. Here I exhibit some of my art works of geometric illusion, color illusion, lightness illusion, motion illusion, etc. web
2. Latest Developments of 3D Illusion
Kokichi Sugihara, Meiji University, Japan
Latest 3D illusion artworks are displayed. They belong to “ambiguous objects”, whose appearances change drastically in mirrors. For example, a square-shape object becomes circular shape in a mirror, and separated parts become intersecting in a mirror. They are created by a mathematical model of the human vision system together with psychological observations of the human preferences in visual perception. The resulting illusion is strong enough to defy our naïve reliance on visual perception.
Firstly, the illusion is stable in the sense that the illusion continues to occur when the viewers move their viewpoints in a certain range, which denies a prevailing common sense that the impossible object illusion occurs only when the objects are seen from a special unique viewpoint. Secondly, the illusion occurs again after viewers understand the true 3D shapes of the objects, which shows that the human brains ignore the knowledge about the object shape and interpret the depth automatically in an illogical manner. Thirdly, the illusion occurs even when viewers see them by their two eyes in a short distance, defying the mathematical nature of binocular stereo principle. Especially, the third point can be experienced only when persons see the objects directly, because pictures and videos are equivalent to seeing the objects by a single eye. In this sense, this exhibition is a good chance to experience the strength of the latest 3D illusion.
Demonstrations (Main Hall)
Wednesday, November 27 12:40-18:00 Thursday, November 28 10:00-18:00 Friday, November 29 10:00-13:15
1. Anomalous Motion Illusion
Presenter: Akiyoshi Kitaoka, Ritsumeikan University, Japan Abstract: Visual illusion or optical illusion refers to illusion in vision or misperception of visual images. A variety of visual illusions are known. Trompel'oeil is sometimes included in visual illusion. Here I exhibit some of my art works of geometric illusion, color illusion, lightness illusion, motion illusion, etc. Talk: Special talk at Mid-sized Hall A, 18:30-19:10, November 27 Links: web
2. Ambiguous Object Illusion
Presenter: Kokichi Sugihara, Meiji University, Japan Abstract: Latest 3D illusion artworks are displayed. They belong to “ambiguous objects”, whose appearances change drastically in mirrors. For example, a square-shape object becomes circular shape in a mirror, and separated parts become intersecting in a mirror. They are created by a mathematical model of the human vision system together with psychological observations of the human preferences in visual perception. The resulting illusion is strong enough to defy our naïve reliance on visual perception. Talk: Special talk at Mid-sized Hall A, 18:30-19:10, November 27 Links: web
3. Dual-View Wire Sculptures
Presenter: Masaki Moriguchi, Chuo University, Japan Abstract: A dual-view wire sculpture is a wire object that appears in dramatically different shapes when viewed from different viewpoints. The presented model can be seen as Rubin's vase. But when we see it from another viewpoint, it looks like a face. In the image, we see faces in the mirror.
4. Displaying Deformation of Virtual Objects Using Visuo-Haptic Interaction
Presenter: Yuki Ban, The University of Tokyo, Japan Abstract: Passive haptics can create various tactile experiences without using complicated equipment, but most of them are limited to presentation on static objects, and are not used for dynamic object presentation which deforms according to applied force. Therefore, in this study, we propose a system which can present various object deformation sensation by measuring the grasping force on the object and generating visual feedback corresponding to it. By manipulating the posture of the virtual hand according to the deformation of the virtual object, the effect of the visuo-haptic interaction is enhanced. Talk: Invited talk at oral session 3D4/VHF4/3DSA4 (9:20-9:40, November 28) Links: web
5. Real-World Implementations of Visual Illusions by Using Augmented Reality Techniques
Presenter: Takahiro Kawabe, NTT Communication Science Laboratories, Japan Abstract: Visual illusions refer to perceptual experiences wherein the appearance of objects and scenes is distorted. By taking advantage of the illusion which is often interpreted as undesired elements in perception, our technique can offer visual experiences which are not produced on the basis of the previous techniques. Talk: Invited talk at oral session 3D4/VHF4/3DSA4 (9:40-10:00, November 28) Links: web1 web2
6. Innovative mobile force display: Buru-Navi
Presenter: Hiroaki Gomi, NTT Communication Science Laboratories, Japan Abstract: Recent virtual-reality (VR) technologies have enriched our visual world. Humans however capture the environment around self-body by acquiring not only visual information but also somatosensory information with touching objects by moving limbs and body. To give somatosensory information in VR, many robot-like devices have been invented. These devices, however, would be difficult to be used in the mobile space. Here we will introduce several types of mobile force-display gadgets ‘Buru-Navi’ which do not need to be supported by the ground,and showcase some application trials for pedestrian navigation and for enhancing immersive sensation along a video scene. Talk: Invited talk at oral session 3D4/VHF4/3DSA4 (9:00-9:20, November 28) Links: web1, web2, video1, video2
7. Digital Haptics Illusion
Presenter: Norio Nakamura1,2, 1:National Institute of Advanced Industrial Science and Technology (AIST), 2: Miransens Inc., Japan Abstract: Haptics Technology “DigitalHaptics” is the world first invention of illusionary haptics technology patented by AIST and Miraisens Inc., which creates a virtual space with joyful digital UX for many application such as game, entertainment, and training, supported with HW, SW, API, SDK, DB, and AI/ML. You can experience many miracle haptics such as Presence, Pushing, Pulling, Texture, and Softness in the mid-air. Talk: Invited talk at oral session INP4 (17:20-17:45, November 28) Links: web, web
8. Visual Illusion Art Work
Presenter: Tamio Hoshika, Sojo University, Japan Links: web
9. Thin colored lines
Presenter: Tama Kanematsu and Kowa Koida, Toyohashi University of Technology, Japan Abstract: The red lines on the demo is not physically colored. This effect is known as simultaneous color contrast, but the effect is strongly enhanced when the gray lines are surrounded by thin white gaps. The effect reflects spatial resolution difference between color and luminance signal of human visual system.
10. Café-Wall like tilt illusion observed in alternately arranged sinusoidal gradation color gratings
Presenter: Masanori Idesawa, The University of Electro-Communications, Japan Abstract: Superposition of sinusoidal gradation primary color (R, G, B) gratings with suitable phase differences (e.g. 0, .2 , .5 ) were arranged alternately in opposite direction with suitable gap lines; the oppositely shifting anomalous motion illusion and the Café-Wall like tilt illusion were perceived. As for the anomalous motion illusion, shifting of retinal image intensity seemed to be produced by the response time difference between cone cells. As for the Café-Wall like tilt illusion, it relying on not the color but the total intensity of gratings; in case of no or wider gap lines and in case of darker or lighter gap lines, the tilt illusion becomes extremely weak. In addition, faint twisted-cord like fringe patterns were recognized on the gap lines parts; then it is expected that the lateral inhibition in retina plays an important role for this tilt illusion.
11. Enhancement of the color-dependent Fraser–Wilcox illusion
Presenter: Kazuhisa Yanaka, Kanagawa Institute of Technology, Japan Abstract: The Fraser–Wilcox illusion reported in 1979 is an impression that an image appears to move despite its stillness. The illusion reported by Kitaoka in 2010 was initially called the optimized Fraser–Wilcox illusion Type V and is now known as the color-dependent Fraser–Wilcox illusion. Such illusion is unique because it is strong and requires combinations of specific colors, such as red and blue. In 2011, Yanaka discovered that the extent of illusion considerably increases when the stimulus vibrates at a few hertz (Fig. 1). In 2015, Yanaka proposed the “color cast hypothesis,” which states that the illusion is caused by the difference in response time between the three kinds of cones (S, M, and L) of the retina, and the color of the color cast (in this example, red) lengthens the response time of the corresponding cone because of fatigue, adaptation, and saturation. In 2019, Yanaka reported that the extent of illusion increased when color-modulated illumination was applied to the stimulus (Fig. 2). In this exhibition, you will experience the increase in the extent of illusion.
12. Effects of Shadow
Presenter: Hiroyasu Ujike, National Institute of Advanced Industrial Science and Technology (AIST), Japan Abstract
Motion-in-depth from cast shadows
Motion of cast shadows induces clear perception of motion-in-depth, which was reported by Kersten et al (1996). They reported the effect is larger when shadow is below relative to the object and when the shadow has a penumbra, which corresponds to the situation that the light source is above and extended. Following their report, Ujike and Saida (1998) conducted several experiments which suggested that the visual system assumes the casting direction of light source, and also the system integrates cast shadows as a depth cue with others, such as size change and blur. The depth of cast shadows is more clear, and people cannot tell if it is real object motion, when it is viewed monocularly with fixed eye position, for example, using aperture for viewing.
Kersten, D., Knill, D.C., Mamassian, P., Bulthoff, I. (1996) Illusory motion from shadows Nature 379, 31
Ujike, H., Saida, S. (1998) Depth perception with shadow and disparity cue combinations, in Selection and Integration of Visual Information: Proc. Int. Workshop Adv. Res. Vis. Cognit., pp. 137–150, STA-NIBH, Tsukuba, Japan