Rendering for 3D Light Field composed of 360° Images

초록

Light Field (LF) is very simple in that it creates views by combining pixels from images. Especially, 3D LF considers light rays passing through a line, not a plane, so it is easy to captures light rays. This paper proposes a LF rendering method in a 3D LF composed of 360 degrees images, which supports maximum field of view. Existing 3D LF acquires light rays with a general camera such as an action camera or a DSLR camera, and the conventional 3D LF rendering takes this into consideration. If the 3D LF rendering method is applied to the 3D LF composed of 360 degrees images, unnatural views are rendered. To cope with this problem, this paper proposes two rendering schemes. First is warping, which is used to create views from equirectangular 360 degrees images. It serves to straighten curved objects in a equirectangular image. Second is light ray selection considering vertical incident angle (LRS-VA). The relationship between light rays and viewpoint motion depends on vertical incident angle, but the conventional 3D LF rendering does not take this into account. By considering this relationship, LRS-VA renders the top and bottom pole views more natural. In addition, LF rendering requires very fast operation speed, and this paper verifies the real-time operation of the proposed method through GPU implementation.

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