In this paper, we present a practical system for enhancing the quality of Low Dynamic Range (LDR) videos using High Dynamic Range (HDR) background images. Our technique relies on the assumption that the HDR information is static in the video footage. This assumption can be valid in many scenarios where moving subjects are the main focus of the footage and do not have to interact with moving lig...

In this study, low dynamic range images were produced from high dynamic range images using hybrid tone mapping. Firstly, high dynamic range images were constructed from the series of images by varying exposure through an image fusion method. Then the high dynamic range images were mapped into 8 bit images using hybrid tone mapping. Our approach is based on combination of luminance map and bilat...

Tone mapping or range reduction is often used in High Dynamic Range (HDR) visual signal compression to take advantage of the existing image/video coding architectures. Thus, it is important to study the impact of tone mapping on the visual quality of decompressed HDR visual signals. To our knowledge, most of the existing studies focus only on the quality loss in the resultant low dynamic range ...

We present Giant Metrewave Radio Telescope 21-cm HI observations towards a sample of compact radio sources behind galaxy groups, to search for cool HI. The results – from high dynamic range spectra for 8 lines-of-sight through 7 galaxy groups – do not show any evidence for absorption by cool HI. At a resolution of 20 km s −1 , the optical depth upper limits obtained were between 0.0075 and 0.03...

We introduce a new metric for dynamic range of displays that closely corresponds with human perception in practical settings. The Number of Distinguishable Grays is a count of the visible luminance steps from the deepest black to the brightest white a display produces under known ambient conditions.