Hiding of phase-based stereo disparity for ghost-free viewing without glasses

Abstract

When a conventional stereoscopic display is viewed without stereo glasses, image blurs, or 'ghosts', are visible due to the fusion of stereo image pairs. This artifact severely degrades 2D image quality, making it difficult to simultaneously present clear 2D and 3D contents. To overcome this limitation (backward incompatibility), here we propose a novel method to synthesize ghost-free stereoscopic images. Our method gives binocular disparity to a 2D image, and drives human binocular disparity detectors, by the addition of a quadrature-phase pattern that induces spatial subband phase shifts. The disparity-inducer patterns added to the left and right images are identical except for the contrast polarity. Physical fusion of the two images cancels out the disparity-inducer components and makes only the original 2D pattern visible to viewers without glasses. Unlike previous solutions, our method perfectly excludes stereo ghosts without using special hardware. A simple algorithm can transform 3D contents from the conventional stereo format into ours. Furthermore, our method can alter the depth impression of a real object without its being noticed by naked-eye viewers by means of light projection of the disparity-inducer components onto the object's surface. Psychophysical evaluations have confirmed the practical utility of our method.

Perceptual enhancement of suprathreshold luminance modulation in stereoscopic patterns

“…An elevation of perceived contrast may be observed when stereoscopic images are artificially synthesized from 2D images by adding binocular disparity information (e.g. Fukiage, Kawabe, and Nishida, 2017 ). Our measurements using the method of constant stimuli indicated that the perceived contrast was 1.1 times higher at 1 degree uncrossed disparity.…”

Widening Viewing Angles of Automultiscopic Displays Using Refractive Inserts

“…Perception and analysis: Incosistent stereoscopic images result in undesirable perceptual artifacts [13], often called 'ghosting'. This could either be caused by incompatible stereoscopic content [25] or due to imperfections in the display system.…”

21‐1: Reducing Image Quality Variation with Motion Parallax for Glassless 3D Screens using Linear Blending Technology

“…Fukiage et al proposed a method for a conventional 3D glasses stereoscopic display to synthesize ghost-free stereoscopic images for no-glasses observers [3]. This method gives binocular disparity to an original 2D image and drives human binocular disparity detectors by the addition of a quadrature phase pattern.…”

“…As a result, when the observer's viewpoint changing, a good image quality image and a bad image quality image change suddenly and smooth transition of image quality could not be reproduced. In order to solve this problem, we have developed and in this paper propose a method to generate the output images of linear blending by using 'hidden stereo' technology [3] that provides disparity by the addition of a quadrature-phase pattern. Image quality evaluations using PSNR (peak signal-to-noise ratio) and SSIM (structural similarity) show that the method effectively reduces image quality variation and makes it possible to further reduce the number of projectors needed without reducing the image quality.…”