A Method to Expand Field of View Using Fisheye Images for the Whole Sphere Based on Equidistant Projection and Its Application to Game Content

Abstract

In this study, we extend a field-of-view expansion method that visualizes 360° spherical information in the virtual space as circular and annular fisheye images based on equidistant projection using an HMD to efficiently discover objects and perform subsequent actions. We report the results of devising and implementing two functions that strengthen this purpose. The first function is to display auxiliary lines useful for specifying the positions of objects in the virtual space, and displays several great circles of a certain size around the user. The second function is to discover an object using the aforementioned fisheye image and then perform an action using the controller in that view. Here, we targeted shooting and confirmed that it was possible to discover objects and hit them using the view and the two proposed functions.