Mr. Junya Kohno Profile

Junya Kohno

at Osaka Metropolitan Univ

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Proceedings Article | 26 February 2020 Paper

Retinal image generation method for retinal projection type super multi-view 3D head-mounted display

Junya Kohno, Kayo Yoshimoto, Hideya Takahashi

Proceedings Volume 11304, 1130413 (2020) https://doi.org/10.1117/12.2545393

KEYWORDS: Head-mounted displays, 3D displays, 3D image processing

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We have proposed the retinal projection type super multi-view head mounted display (HMD). The super multi-view method provides stereoscopic information by inducing the accommodation of the human eye by blurring the retinal image. This method uses the principle of Maxwellian view and reconstruct the blur image by overlapping projected each parallax image on the retina. However, considering only the degree of the overlap of the projected parallax images on the retina is not enough for reconstructing the real blur. In order to overcome this problem, we propose the optimal method considering not only the degree of the overlap of the parallax images projected on the retina but also the light intensity of each parallax image to reconstruct the real blur. From the evaluation experiment, we verified that the proposed method improves the reproducibility of blur compared to the method considering only the degree of superimposition of the parallax images projected on the retina. Furthermore, it was also confirmed that the prototype system can display 3D images in the depth range of human ocular accommodation from 200mm to 2000mm. The super multi-view HMD based on the proposed method can induce the accommodation of the human eye with the high reproducibility blur and provide more natural 3D images.

Proceedings Article | 1 March 2019 Paper

Analysis of displayable depth range for retinal projection type super multi-view 3D head-mounted display using the time division projection optical system

Hiroaki Maeda, Junya Kohno, Kayo Yoshimoto, Hideya Takahashi

Proceedings Volume 10942, 109420X (2019) https://doi.org/10.1117/12.2506983

KEYWORDS: Head-mounted displays, 3D displays

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We have previously proposed the retinal projection type super multi-view head-mounted display (HMD) using the time division projection optical system. By using the super multi-view HMD, it is possible to provide the viewer with the threedimensional (3D) image that induces the accommodation of a human eye naturally. In order to realize the super multi-view method, it is necessary to simultaneously project multiple parallax images on the retina. However, when the parallax between each parallax image is large and the corresponding pixels of each parallax image on the retina do not overlap each other, the retinal image is observed as multiple projection images, therefore the accommodation cannot be induced. In this paper, to estimate the displayable range of 3D image of the proposed super multi-view HMD, we revealed the relationship between the number of parallax images and the displayable range of 3D image by using Gullstrand’s schematic eye model and the analysis of the light intensity distributions of retinal images. In order to verify the displayable range of 3D image, we constructed the prototype HMD which projected five parallax images on the retina. We confirmed that the displayable range of 3D image of the prototype HMD is from 900 mm to 2000 mm in front of human eye. By clarifying the relationship between the number of parallax images and the displayable range of 3D image, it is possible to freely design the display range of 3D image of the retinal projection type super multi-view HMD.

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