Light-field displays are good candidates in the field of glasses-free 3D display for showing real 3D images without decreasing the image resolution. Light-field displays can create light rays using a large number of projectors in order to express the natural 3D images. However, in light-field displays using multi-projectors, the compensation is very critical due to different characteristics and arrangement positions of each projector. In this paper, we present an enhanced 55- inch, 100-Mpixel multi-projection 3D display consisting of 96 micro projectors for immersive natural 3D viewing in medical and educational applications. To achieve enhanced image quality, color and brightness uniformity compensation methods are utilized along with an improved projector configuration design and a real-time calibration process of projector alignment. For color uniformity compensation, projected images from each projector are captured by a camera arranged in front of the screen, the number of pixels based on RGB color intensities of each captured image is analyzed, and the distributions of RGB color intensities are adjusted by using the respective maximum values of RGB color intensities. For brightness uniformity compensation, each light-field ray emitted from a screen pixel is modeled by a radial basis function, and compensating weights of each screen pixel are calculated and transferred to the projection images by the mapping relationship between the screen and projector coordinates. Finally, brightness compensated images are rendered for each projector. Consequently, the display shows improved color and brightness uniformity, and consistent, exceptional 3D image quality.
In this paper, an inversion-free subpixel rendering method that uses eye tracking in a multiview display is proposed. The
multiview display causes an inversion problem when one eye of the user is focused on the main region and the other eye
is focused on the side region. In the proposed method, the subpixel values are rendered adaptively depending on the eye
position of the user to solve the inversion problem. Also, to enhance the 3D resolution without the color artifact, the
subpixel rendering algorithm using subpixel area weighting is proposed instead of the pixel values. In the experiments,
36-view images were seen using active subpixel rendering with the eye tracking system in a four-view display.