Topic
Tone mapping
About: Tone mapping is a research topic. Over the lifetime, 1713 publications have been published within this topic receiving 48490 citations.
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28 Mar 2013
TL;DR: A new tone mapping technique for high dynamic range images based on the retinex theory is presented, which provides satisfactory results while preserving details and reducing halo artifacts.
Abstract: In this paper, we present a new tone mapping technique for high dynamic range images based on the retinex theory. Our algorithm consists of two steps, global adaptation and local adaptation of the human visual system. In the local adaptation process, the Gaussian filter of the retinex algorithms is substituted with a guided filter to reduce halo artifacts. To guarantee good rendition and dynamic range compression, we propose a contrast enhancement factor based on the luminance values of the scene. In addition, an adaptive nonlinearity offset is introduced to deal with the strength of the logarithm function's nonlinearity. Experiments show that our algorithm provides satisfactory results while preserving details and reducing halo artifacts.
53 citations
01 Dec 2008
TL;DR: This work presents a simple and cost-efficient way of extending contrast, perceived tonal resolution, and color space of reflective media, such as paper prints, hardcopy photographs, or electronic paper displays, through a calibrated projector-camera system.
Abstract: We present a simple and cost-efficient way of extending contrast, perceived tonal resolution, and color space of reflective media, such as paper prints, hardcopy photographs, or electronic paper displays. A calibrated projector-camera system is applied for automatic registration, radiometric scanning and superimposition. A second modulation of the projected light on the surface of such media results in a high dynamic range visualization. This holds application potential for a variety of domains, such as radiology, astronomy, optical microscopy, conservation and restoration of historic art, modern art and entertainment installations.
52 citations
Patent•
05 Jul 2011
TL;DR: In this paper, an encoding apparatus for encoding a first view high dynamic range image and a second view high-dynamic range image comprising of first and second HDR image receivers (203, 1201) was proposed.
Abstract: Several approaches are disclosed for combining HDR and 3D image structure analysis and coding, in particular an encoding apparatus for encoding a first view high dynamic range image and a second view high dynamic range image comprising: first and second HDR image receivers(203, 1201) arranged to receive the first view high dynamic range image and a second view high dynamic range image; a predictor (209) arranged to predict the first view high dynamic range image from a low dynamic range representation of the first view high dynamic range image;and a view predictor (1203) to predict the second view high dynamic range image from at least one of the first view high dynamic range image, a low dynamic range representation of the second view high dynamic range image, or a low dynamic range representation of the first view high dynamic range image.
52 citations
03 Oct 2000
TL;DR: An interactive system for computer aided generation of line art drawings to illustrate 3D models that are given as triangulated surfaces using streamlines, an intuitive and simple tone mapping algorithm can be derived to generate the final rendering.
Abstract: We present an interactive system for computer aided generation of line art drawings to illustrate 3D models that are given as triangulated surfaces. In a preprocessing step, an enhanced 2D view of the scene is computed by sampling for every pixel the shading, the normal vectors and the principal directions obtained from discrete curvature analysis. Then streamlines are traced in the 2D direction fields and are used to define line strokes. In order to reduce noise artifacts, the user may interactively select sparse reference lines and the system will automatically fill in additional strokes. By exploiting the special structure of the streamlines, an intuitive and simple tone mapping algorithm can be derived to generate the final rendering.
51 citations
Patent•
12 Mar 2013TL;DR: In this paper, a tone mapping module which outputs a tone-mapped luminance signal for output image data and a color mapping module that outputs chroma signals for the output data is presented.
Abstract: Several embodiments of an efficient tone mapping of high bit depth video to low bit depth displays are disclosed. In one embodiment, a system maps an input image data of a high dynamic range (HDR) onto output image data of a lower dynamic range (LDR) and where the mapping does not transform the input image data from one color space to another color space. One embodiment comprises a tone mapping module which outputs a tone-mapped luminance signal for output image data and a color mapping module which outputs chroma signals for the output image data. Intermediate image processing steps may be avoided and hence may increase the efficiency of the mapping.
51 citations