Capturing high dynamic range images with partial re-exposures

Abstract

In this paper we present an optimized approach to capture high dynamic range (HDR) images. It is based on existing methods of creating HDR images by fusing a set of differently exposed low dynamic range (LDR) images. We optimize the capturing process of LDR images towards improved capture speed by using partial re-exposures. That is, we make use of the idea that it is not always necessary to capture full size images when only small portions of the scene require HDR. By analyzing captured images for badly exposed regions and re-exposing selectively, we save overall capture time and increase the frame rate when image sequences are recorded.