Abstract
The mid-air image is a very powerful method for presenting computer graphics in a real environment, but it cannot be used in bright locations owing to the decrease in brightness during the imaging process. Therefore, to form a mid-air image with a high-brightness light source, a square pyramidal mirror structure was investigated, and the sunlight concentration was simulated. We simulated the tilt angle and combination angle of the condenser as parameters to calculate the luminance of the surface of a transparent liquid crystal display. The light collector was installed at 55∘ from the horizontal plane and mirror. A high level of illumination was obtained when these were laminated together at an angle of 70∘. To select a suitable diffuser, we prototyped and measured the brightness of the mid-air image with an LED lamp to simulate sunlight in three settings: summer solstice, autumnal equinox, and winter solstice. The maximum luminance of the mid-air image displayed by collecting actual sunlight was estimated to be 998.6 cd/m2. This is considerably higher than the maximum smartphone brightness to allow for outdoor viewing, and it can ensure fully compatible visibility.
Highlights
Augmented reality (AR) technology is currently used in the entertainment industry to make fictional characters appear as if they exist in real space
Mid-air imaging technology, in which real images are formed in the air by reflecting and refracting the light emitted from a light source, is one of the most useful methods for creating computer graphics (CG) and real space
The magnitude of the mid-air image brightness was dependent on the direction of the light source and type of diffuser for each season, and the magnitude of the illuminance on the surface of the transparent LCD for each season could be determined
Summary
Augmented reality (AR) technology is currently used in the entertainment industry to make fictional characters appear as if they exist in real space. One means of achieving AR is by superimposing images on an HMD of a device worn by the user, or on a tablet or other device. Methods are available that do not burden users, such as displaying virtual images of computer graphics (CG) characters by using a half-mirror or superimposing CG images on images captured by a camera to display the characters on the screen of a tablet device. The CG characters displayed in the former are virtual images, whereas the characters are displayed only on the screen in the latter; this makes it difficult for observers to interact with the characters in the real world. Mid-air imaging technology, in which real images are formed in the air by reflecting and refracting the light emitted from a light source, is one of the most useful methods for creating CG and real space.
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