High dynamic range tone mapping based on Per-Pixel Exposure Mapping
Jason Huang,Valmiki Rampersad,Steve Mann +2 more
- pp 98-106
TLDR
A novel method for compressing High Dynamic Range (HDR) images by Per-Pixel Exposure Mapping (PPEM), which takes advantage of the camera response to enable exposure synthesis which is called Wyckoff set expansion.Abstract:
The needs of a realtime vision aid require that it functions immediately, not merely for production of a picture or video record to be viewed later. Therefore the vision system must offer a high dynamic range (often hundreds of millions to one) that functions in real time. In compliment with the existing efficient and real-time HDR compositing algorithms, we propose a novel method for compressing High Dynamic Range (HDR) images by Per-Pixel Exposure Mapping (PPEM). Unlike any existing methods, PPEM only varies exposure to achieve tone mapping. It takes advantage of the camera response to enable exposure synthesis which we call Wyckoff set expansion. The method evaluates the synthetic exposures in a recursive pairwise process to generate a tone mapped HDR image. The results can be approximated using a look-up table, which can be used for real-time HDR applications.read more
Citations
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Journal ArticleDOI
Asymptotic form of the Kullback–Leibler divergence for multivariate asymmetric heavy-tailed distributions
TL;DR: In this article, an asymptotic expression for the Kullback-Leibler (KL) divergence measure of multivariate skew-t distributions (MST) is derived.
Patent
Device for synthesizing high dynamic range image based on per-pixel exposure mapping and method thereof
TL;DR: In this paper, a per-pixel exposure mapping is used to synthesize a high dynamic range image based on per-pixels exposure mapping using an image capturing module, an image processing module, and a recursive control module.
Proceedings ArticleDOI
HDR (High Dynamic Range) Audio Wearable and Its Performance Visualization
TL;DR: The results show that real-time HDR audio processing and visualization are possible at the standard audio sampling rate of 44.1 kHz and the quality of the recorded audio improved from the originally captured data after HDR processing.
Proceedings ArticleDOI
Automatic Gain Control for Enhanced HDR Performance on Audio
TL;DR: In this paper, a method to enhance the performance of the high dynamic range (HDR) technique on audio signals by automatically controlling the gains of the individual signal channels is presented.
Proceedings ArticleDOI
High Dynamic Range (HDR) Signal Processing on Software-Defined Radio
TL;DR: This study uses commercially available software-defined radios with 48 dB of dynamic range to demonstrate the application of high dynamic range technique on radio frequency (RF) signals to increase the dynamic range of these signals beyond the hardware system limitations.
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