This paper presents a novel projector selection method to improve the projected image quality on a solid object (such as fabricated 3D objects) in terms of spatial resolution for multi-projection system. The spatial resolution degradation of a projected image is mathematically represented as convolution of the point spread function (PSF) of each projected pixel and an original image. Previous researchers focused on the area or shape of the PSF, and chose a projector to display high resolution images on the solid object. However, the PSF information alone is not sufficient for the best projector selection, because the resolution of a projected result is dependent not only on the PSF but also the original image content. Therefore, we propose to select a projector that can display an image with the highest resolution by estimating the projected results from all projectors in the system, and evaluating how original image information is preserved in each estimated result. Through experiments, we confirmed that the proposed method provided projected results with better image qualities than conventional methods.
Digital fabrication and physical computing have become widespread, and the field of electronics has recently attracted the general public, requiring a novice user to understand specifications of parts. A user is often demotivated when learning with specification sheets and without real experience. In this thesis, we present a system to achieve both, a sense of reality and high-speed learning through trial and error. Our system uses lighting with projection mapping, even over 3D printed mock-ups, to create a software simulator with a high sense of reality, thereby motivating users to learn. This paper describes the configuration of the system and presents user feedback received from the demonstration of the system.
The exterior design is an important factor in controlling the overall impression a product. In the case of a robot design, the factors that make up its appearance are not only its motions but also its shape, and therefore, when designing a robot, its motions and shape should be designed in the same way. In this paper, we propose a method for designing the shape and motions of a robot that make it appear as if it were a soft creature. When we see the rotation of its curved pipes, which appear to twist, we can feel as if the robot is changing its shape. Using this structure, we developed a specific robot called "Flagella," which moves softly like an animal. Herein, we show the design, implementation, and feedback of the Flagella robot.
In this paper, a lo-fi prototyping system using digital materials is proposed. After 3D printing and CNC milling machine became popularized, we can achieve physical form easily by them, but can't build structures more precise than the accuracy of the machine itself. Besides, it requires many processes on recycling. By using digital materials, we can build reconfigurable 3D structures, and we can build structures more precise than the accuracy of the machine itself. In previous researches about digital material, its assembly couldn't be repeated and reversed smoothly. If we can design a digital material like this, it can be used as a lo-fi prototyping system for city or space design instead of using LEGO blocks. After considering the reversible assembly, we designed the digital material, "Kelvin Block" that applies magnetic force for assembly and disassembly. A "3D assembler" is developed for picking and dropping Kelvin Blocks automatically. It accelerates the prototyping speed and the building process will be more stable than other digital fabrication tools. In this way, we are able to make lo-fi prototype for the city or space design more rapid and stable.
We propose a combination of multiple functional inks, including conductive silver ink, thermo-chromic ink, and regular inkjet ink, for a novel paper-based interface called Inkantatory Paper that can dynamically change the color of its printed pattern. Constructed with off-the-shelf inkjet printing using silver conductive ink, our system enables users to fabricate thin, flat, flexible, and low-cost interactive paper. In addition, we realize thermal feedback control by using a thermo sensor. We evaluated the characteristics of the conductive silver ink as a heating system for the thermo-chromic ink and created applications demonstrating the usability of the system.
We have proposed a method to detect stretch of elastic fabric such as stocking and rubber membrane using photo reflector that consist of an IR LED and a phototransistor. The sensing method used is based on our observation that photoreflectors can be used to measure the ratio of expansion and contraction of a stocking using the changes in transmissivity of IR light passing through the stocking. Then, we have developed a simple stretchable sensor that can be easily attached to curved as well as flat surfaces and used to measure tangential force generated by pinching and dragging interactions. Since a stocking is thin, stretchable, and nearly transparent, it can be easily attached to various types of objects such as mobile devices, robots, and different parts of the body as well as to various types of conventional pressure sensors without altering the original shape of the object. It can also present natural haptic feedback in accordance with the amount of force exerted. A system using several such sensors can determine the direction of a two-dimensional force. A variety of example applications illustrated the utility of this sensing system.
In this research, we would propose the system for users to share individual skills and help improving their fabrication skills of sketching into 3D space with a 3D pen. Here, we would propose two assistance tools that help the users improve their fabrication skills, "FabTable" by displaying and "3D Tracer" by letting them trace the movement. We examine the new way to carry on the tradition of fabrication skill with a unique characteristic " sketch in 3D space" while there exist several early studies about sharing fabrication skills.
We propose a system "CoPlet" which meets 2 requirements of museum tour. It allows tour staff and participants to share impression using recorded voice in real time with assuring anonymity. Also, it provides participants personalized leaflet, Peaflet, which reflects personal tour experience as a souvenir. In this paper, we report the result of experiments at the National Museum of Emerging Science and Innovation. The result revealed that CoPlet is effective for sharing impression of museum tour. Also, the data that CoPlet can collect is useful for discussing better science communication.
This paper proposes a novel radiometric compensation technique for cooperative projection system based-on distributed optimization. To achieve high scalability and robustness, we assume cooperative projection environments such that (1) each projector does not have any information about other projectors as well as target images, (2) the camera does not have any information about the projectors either, while having the target images, and (3) only a broadcast communication from the camera to the projectors is allowed to suppress the data transfer bandwidth. The effectiveness of the proposed method is guaranteed theoretically, and also demonstrated through both simulation and real projection experiments.
We present Graffiti Fur, a display technology that utilizes the phenomenon of the change in shading properties of fur as the fibers are raised or flattened. Users can erase drawings by first flattening the fur surface through sweeping by hand in the fiber's growth direction. Then, users can raise the fibers by moving fingers in the opposite direction, which create lines of drawing. These material properties are commonly found in various items such as carpets in our living environments. We demonstrate our concept by developing three different devices to draw patterns on a "fur display" utilizing this phenomenon: a roller device, a pen device, and a pressure projection device. Graffiti Fur can turn common objects in our environment into re-writable canvas without requiring or creating any non-reversible modifications. In addition, Graffiti Fur can present large-scale images without glare, and the created images require no maintenance costs.
Wearable projection systems enable hands-free viewing via large projected screens, and eliminating the need to hold devices. These systems need a surface of projection and interaction. However, in case of choosing a wall as the projection surface, users have to be positioned in front of the wall when they wish to access information. In this paper, we propose a wearable input/output interface for floor projection system composed of a mobile projector, a depth sensor and a gyro sensor. It allows user to conduct "select" and "drag" operation by footing and fingertips controlling in the projected image on floor. Also it can provide user more efficient GUI operations on floor with combining hand and toe input. To confirm advantage and limitations of the system, we conduct user study. Finally we suggest guidelines and identify some problems when designing an interface for the interaction between the hand/toe and the floor. We also suggest the input method which uses both a finger and a toe.