Topic
Tone mapping
About: Tone mapping is a research topic. Over the lifetime, 1713 publications have been published within this topic receiving 48490 citations.
Papers published on a yearly basis
Papers
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15 Mar 2012
TL;DR: Tone manipulation is a luminance compression, which usually causes darker tones to appear brighter and distorts contrast relationships, and tone mapping reduces the dynamic range or contrast ratio of the entire image.
Abstract: Tone manipulation is a luminance compression, which usually causes darker tones to appear brighter and distorts contrast relationships. Tone mapping reduces the dynamic range or contrast ratio of the entire image. High Dynamic range imaging is an attractive technique to capture real world luminance in the scene for each pixel. Various tone mapping operators such as Drago, Reinhard, Ward, Ashikmin, Piecewise, Retinex are available for converting high dynamic range images to displayable low dynamic range image. The performance of various tone mapping operators are evaluated. Multiple exposure pictures are combined together to form a High Dynamic Range image (HDR) and tone mapping operators are applied to form Low Dynamic Range image (LDR) and the result images are compared with the original image. Color correction and Hierarchical tone mappings are applied to enhance the image quality.
5 citations
Patent•
17 Oct 2017
TL;DR: In this paper, an image to be processed is partitioned into a plurality of sub-regions, and an overall brightness control parameter is introduced when a series of central points of the subregions of the image is determined, so that the problem that a whole output image is too bright or too dark since the overall brightness of image cannot be controlled in a local tone mapping method of an existing wide dynamic technology is solved.
Abstract: The invention discloses an image processing method and device and computing equipment. An image to be processed is partitioned into a plurality of sub-regions, and an overall brightness control parameter is introduced when a series of central points of the sub-regions of the image to be processed are determined, so that the problem that a whole output image is too bright or too dark since the overall brightness of the image cannot be controlled in a local tone mapping method of an existing wide dynamic technology is solved. Meanwhile, contrast compression control parameters are introduced, so that introduction of new noise is avoided, and the quality of the output image is ensured. Moreover, the contrast compression control parameters of the sub-regions can be adjusted adaptively according to a relative error between an average output brightness value and an average input brightness value of the sub-regions, thereby achieving a relatively high automation degree.
5 citations
01 Dec 2011
TL;DR: A watermarking scheme targeting HDR images is proposed, which is based on bilateral filtering, and can be significantly improved by an average of 20dB in PSNR with corresponding improvement in subjective quality.
Abstract: As the future of digital photography, high dynamic range imaging (HDRI) has been widely applied in daily applications. However, since the visual quality of HDR images is very sensitive to luminance value variations, the conventional watermarking methods present inefficiency because of introducing many visible image distortions. In this paper, a watermarking scheme targeting HDR images is proposed, which is based on bilateral filtering. Watermarks are embedded into detail part of HDR image which is the residual image between the HDR image and the bilateral filtered image. The objective quality of the watermarked images can be significantly improved by an average of 20dB in PSNR with corresponding improvement in subjective quality. It also shows higher robustness against tone mapping operations.
5 citations
TL;DR: It is concluded that the best tone reproduction technique between HDR displays strongly depends on the lighting style of the content, especially when adapting to various lighting styles.
Abstract: High Dynamic Range (HDR) is the latest trend in television technology and we expect an in
ux of HDR capable
consumer TVs in the market. Initial HDR consumer displays will operate on a peak brightness of about 500-1000
nits while in the coming years display peak brightness is expected to go beyond 1000 nits. However, professionally
graded HDR content can range from 1000 to 4000 nits. As with Standard Dynamic Range (SDR) content, we
can expect HDR content to be available in variety of lighting styles such as low key, medium key and high key
video. This raises concerns over tone-compatibility between HDR displays especially when adapting to various
lighting styles. It is expected that dynamic range adaptation between HDR displays uses similar techniques as
found with tone mapping and tone expansion operators. In this paper, we survey simple tone mapping methods
of 4000 nits color-graded HDR content for 1000 nits HDR displays. We also investigate tone expansion strategies
when HDR content graded in 1000 nits is displayed on 4000 nits HDR monitors. We conclude that the best tone
reproduction technique between HDR displays strongly depends on the lighting style of the content.
5 citations
08 Jun 2018
TL;DR: Techniques for high dynamic range (HDR) imaging make it possible to capture and store an increased range of luminances and colors as compared to what can be achieved with a conventional camera.
Abstract: Techniques for high dynamic range (HDR) imaging make it possible to capture and store an increased range of luminances and colors as compared to what can be achieved with a conventional camera. Thi ...
5 citations