Simple multiresolution approach for representing multiple regions of interest (ROIs)
Andrew T. Duchowski, Bruce H. McCormick · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1995
A simple spatial-domain multiresolution scheme is presented for preserving multiple regions of interest (ROIs) in images. User-selected ROIs are maintained at high (original) resolution while peripheral areas are degraded. The presented method is based on the well-known MIP texture mapping algorithm used extensively in computer graphics. Most ROI schemes concentrate on preserving a single foveal region, usually attempting to match the visual acuity of the human visual system (HVS). The multiple ROI scheme presented here offers three variants of peripheral degradation, including linear and nonlinear resolution mapping, as well as a mapping matching HVS acuity. Degradation of image pixels is carried out relative to each ROI. A simple criterion is used to determine screen pixel membership in given image ROIs. Results suggest that the proposed multiple ROI representation scheme may be suitable for gaze-contingent displays as well as for encoding sparse images while optimizing compression and visual fidelity.