In our paper, we introduced a low energy, high frequency, shift variant component ρ̂ of the light transport function H, that captures cross-screen filter diffraction effects rS present in the captured image. In this section, we derive statistical properties of this function rS which we use in our paper (Equation 9 in the paper). First, we present empirical properties of derivatives of ρ̂ , and th...

We present a novel algorithm to efficiently generate high quality high dynamic range (HDR) images. Our method is based on the idea of expanding the dynamic range of a reference image at granularity of tiles. In each tile, we use data from a single exposure, but different tiles can come from different exposures. We show that this approach is not only efficient and robust against camera and objec...

Showing high dynamic range images on general displayers whose dynamic ranges are relatively low will result in images with undesirable artifacts such as underexposure or overexposure images. To display images without unwanted artifacts, a Retinex-based tone mapping method is proposed in this paper. We present the weighted edge-preserving smooth filter to estimate a smoother illumination, and a ...

In this paper, we propose a coding algorithm for High Dynamic Range Images (HDRI). Our encoder applies a tone mapping model based on scaled μ-Law encoding, followed by a conventional Low Dynamic Range Image (LDRI) encoder. The tone mapping model is designed to minimize the difference between the tone-mapped HDRI and its LDR version. By virtue of the nature of the μ-Law model, not only the quali...

A tone mapping algorithm for displaying high contrast scenes was designed on the basis of the results of experimental tests using human subjects. Systematic perceptual evaluation of several existing tone mapping techniques revealed that the most “natural” appearance was determined by the presence in the output image of detailed scenery features often made visible by limiting contrast and by pro...

Video recording and photography are frequently used to document Cultural Heritage (CH) objects and sites. High Dynamic Range (HDR) imaging is increasingly being used as it allows a wider range of light to be considered that most current technologies are unable to natively acquire and reproduce. HDR video content however has only recently become possible at desirable, high definition resolution ...

RÉSUMÉ. La HDR (High Dynamic Range) permet de représenter des images d'une manière analogue à la représentation de notre système de vision et de manière plus complexe que dont nous disposons à l'heure actuelle sur notre ordinateur. Cet article propose d'analyser le comportement des extracteurs de points d'intérêt spatiaux et spatio-temporels lors de leur utilisation sur des vidéos HDR en les co...

This paper presents an approach for improving the effective dynamic range of cameras by using multiple photographs of the same scene taken with different exposure times. Using this method enables the photographer to accurately capture scenes that contain a high dynamic range, i.e., scenes that have both very bright and very dark regions. The approach requires an initial calibration, where the c...

Many real-world scenes contain a dynamic range that exceeds conventional display technology by several orders of magnitude. Through the combination of several existing technologies, new high dynamic range displays, capable of reproducing a range of intensities much closer to that of real environments, have been constructed. These benefits come at the cost of more optically complex devices; invo...

Alessandro Rizzi John J. McCann Abstract — Intraocular glare and simultaneous contrast control appearance in high-dynamic-range (HDR) images. This paper describes unique test targets that simulate real images. These targets change the HDR range by 500 times, without significantly changing the veiling glare on the retina. As well, these targets have nearly constant simultaneous contrast. The ran...