High dynamic range display systems

Abstract

Figure 1: From left to right: our projector-based display showing an HDR image; our LED-based HDR display showing a discrete and a smooth intensity ramp (the top half of the discrete ramp and the bottom half of the smooth ramp have each been covered by a 1% transparent filter to illustrate high luminance content on the left side of the image, which cannot be captured by the camera); a color-coded original HDR image; HDR photograph taken off the screen of our projector-based system; HDR photograph taken off a conventional monitor displaying the tone-mapped image. AbstractThe dynamic range of many real-world environments exceeds the capabilities of current display technology by several orders of magnitude. In this paper we discuss the design of two different display systems that are capable of displaying images with a dynamic range much more similar to that encountered in the real world. The first display system is based on a combination of an LCD panel and a DLP projector, and can be built from off-the-shelf components. While this design is feasible in a lab setting, the second display system, which relies on a custom-built LED panel instead of the projector, is more suitable for usual office workspaces and commercial applications. We describe the design of both systems as well as the software issues that arise. We also discuss the advantages and disadvantages of the two designs and potential applications for both systems.

Automatic Panoramic Image Stitching using Invariant Features

“…Vignetting (decrease in intensity towards image edges) is a common source of artifacts, particularly in uniform colour regions such as sky (Goldman and Chen, 2005). One could also acquire high-dynamic range (Debevec and Malik, 1997;Seetzen et al, 2004) information from the overlapping image regions, and render tone mapped or synthetic exposure images.…”

Dynamic range expansion of video sequences: A subjective quality assessment study

“…Next generation high dynamic range (HDR) displays [1] can reproduce far higher luminance and contrast levels than their LCD or CRT predecessors, and they are expected to gain a large television market share in the coming years. However, most of the existing image and video content is low dynamic range (LDR) and needs to be converted to HDR to be viewed on HDR displays.…”

Assessment of PACS Display Systems

“…At the present time there are no displays bright enough to meet the AAPM contrast ratio criteria in normal room light, although displays with contrast ratios of over 3,000 and maximum luminance equivalent to room light have been described. 13 …”