360-degree screen-free floating 3D image in a crystal ball using a spatially imaged iris and rotational multiview DFD technologies

Kawakami, Toru; Date, Muneyuki; Sasai, Mutsumi; Takada, Hideaki

doi:10.1364/ao.56.006156

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…Examples we have developed include autostereoscopic optical linear blending 3D displays using projection optics [15,16] and a ball lens [17]. However, the distortion imposed by projection optics seriously degrades images and reduces the effect of linear blending.…”

Section: Velf3d Displaymentioning

confidence: 99%

Depth Range Control in Visually Equivalent Light Field 3D

Date

Shimizu

Kimata

et al. 2021

IEICE Trans. Electron.

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3D video contents depend on the shooting condition, which is camera positioning. Depth range control in the post-processing stage is not easy, but essential as the video from arbitrary camera positions must be generated. If light field information can be obtained, video from any viewpoint can be generated exactly and post-processing is possible. However, a light field has a huge amount of data, and capturing a light field is not easy. To compress data quantity, we proposed the visually equivalent light field (VELF), which uses the characteristics of human vision. Though a number of cameras are needed, VELF can be captured by a camera array. Since camera interpolation is made using linear blending, calculation is so simple that we can construct a ray distribution field of VELF by optical interpolation in the VELF3D display. It produces high image quality due to its high pixel usage efficiency. In this paper, we summarize the relationship between the characteristics of human vision, VELF and VELF3D display. We then propose a method to control the depth range for the observed image on the VELF3D display and discuss the effectiveness and limitations of displaying the processed image on the VELF3D display. Our method can be applied to other 3D displays. Since the calculation is just weighted averaging, it is suitable for real-time applications.

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Section: Velf3d Displaymentioning

confidence: 99%

Depth Range Control in Visually Equivalent Light Field 3D

Date

Shimizu

Kimata

et al. 2021

IEICE Trans. Electron.

Self Cite

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“…In addition, several recent optical designs with 360-degree displays have been demonstrated. Nonetheless, one the design requires multiple imaging sources configured around a small 3D volume [25], while the other does display in the free space at all [26].…”

Section: Introductionmentioning

confidence: 99%

Reciprocal 360-deg 3D light-field image acquisition and display system [Invited]

Yöntem

Chu

2019

J. Opt. Soc. Am. A

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A reciprocal 360-degree three-dimensional light-field image acquisition and display system was designed using a common catadioptric optical configuration and a lens array. Proof-of-concept experimental setups were constructed with a full capturing part and a truncated display section to demonstrate that the proposed design works without loss of generality. Unlike conventional setups, which record and display rectangular volumes, the proposed configuration records 3D images from its surrounding spherical volume in the capture mode and project 3D images to the same spherical volume in the display mode. This is particularly advantageous in comparison to other 360-degree multi-camera and multiple projector display systems which require extensive image and physical calibration. We analysed the system and showed the quality measures such as angular resolution and space bandwidth product based on design parameters. The issue due to the pixel size difference between the available imaging sensor and the display was also addressed. A diffractive microlens array matching the sensor size is used in the acquisition part whereas a vacuum cast lens array matching the display size is used in the display part with scaled optics. The experimental results demonstrate the proposed system design works well and in good agreement with the simulation results.

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