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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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Patent
10 Sep 2013
TL;DR: In this paper, a tone mapping function and backlight intensity are determined based at least in part on the one or more pixel brightness values in the linear space, which are converted to the nonlinear space and applied to the image frame or a subsequent image frame in the pixel pipeline.
Abstract: Systems, methods, and devices are provided for histogram generation and evaluation used in adjusting the power consumed by a backlight of an electronic display. One such method involves generating a pixel brightness histogram of an image frame passing through a pixel pipeline in a nonlinear space. One or more pixel brightness values from the histogram may be selected before being converted from the nonlinear space into a linear space. A tone mapping function and backlight intensity are determined based at least in part on the one or more pixel brightness values in the linear space. The resulting tone mapping function is converted to the nonlinear space and applied to the image frame or a subsequent image frame in the pixel pipeline. The pixels of the image frame to which the nondistorting portion of the tone mapping function is applied may appear substantially undistorted despite a reduction in backlight intensity.

5 citations

Proceedings ArticleDOI
07 Apr 2015
TL;DR: An explicit answer is derived for a simplified model of a two-layer compression system in the high bit-rate approximation for a HDR to LDR tone mapping that approximates the well-known sRGB non-linearity of ?
Abstract: The issue of backwards compatible image and video coding gained some attention in both MPEG and JPEG, let it be as extension for HEVC, let it be as the JPEG XT standardization initiative of the SC29WG1 committee. The coding systems work all on the principle of a base layer operating in the low-dynamic range regime, using a tone-mapped version of the HDR material as input, and an extension layer invisible to legacy applications. The extension layer allows implementations conforming to the full standard to reconstruct the original image in the high-dynamic range regime. What is also common to all approaches is the rate-allocation problem: How can one split the rate between base and extension layer to ensure optimal coding? In this work, an explicit answer is derived for a simplified model of a two-layer compression system in the high bit-rate approximation. For a HDR to LDR tone mapping that approximates the well-known sRGB non-linearity of ? = 2.4 and a Laplacian probability density function, explicit results in the form of the Lambert-W-function are derived. The theoretical results are then verified in experiments using a JPEG XT demo implementation.

5 citations

Patent
11 Jan 2013
TL;DR: In this article, a non-transitory computer-readable medium for tone mapping an error correction code for 1 MHz OFDM transmission was provided, and a tone mapper was configured to tone map at least error correction codeword to data tones of an orthogonal frequency-division multiplexing (OFDM) symbol.
Abstract: This disclosure provides systems, methods, and apparatus, including non-transitory computer-readable medium for tone mapping an error correction code for 1 MHz OFDM transmission. In one aspect, a wireless communications apparatus is provided. The wireless communications apparatus includes a tone mapper configured to tone map at least error correction codeword to data tones of an orthogonal frequency-division multiplexing (OFDM) symbol based on an error correction code tone mapping distance selected from the group consisting of 2, 3, and 4. The OFDM symbol has twenty four data tones, at least one pilot tone, a DC tone, and at least one guard tone. The wireless communications apparatus further includes a transmit module configured to transmit the at least one tone mapped error correction codeword using about a 1 MHz OFDM transmission mode.

5 citations

Proceedings ArticleDOI
01 Sep 2017
TL;DR: Experimental results demonstrate that the HSGETM has higher edge, and naturalness preserving capability, which is homologous to the HVS, as compared to other state-of-the-art tone mapping approaches.
Abstract: With the growing popularity of High Dynamic Range Imaging (HDR), the necessity for advanced tone-mapping techniques has greatly increased. We propose a Human Visual System (HVS)-inspired Saliency Guided Edge-preserving Tone Mapping method (HSGETM) that uses saliency region information of an HDR image as input to the guided filter for a base and detail image layer separation. After detail layer enhancement and base layer compression with constant weights, a new edge preserved tone mapped image is composed by adding the layers back together with saturation and exposure adjustments. The filter operation is faster due to the use of the guided filter which has O(N) time operation with N number of pixels. Experimental results demonstrate that the HSGETM has higher edge, and naturalness preserving capability, which is homologous to the HVS, as compared to other state-of-the-art tone mapping approaches.

5 citations

Journal ArticleDOI
TL;DR: In this article , the authors proposed the reappearance effect of the TMIs index (RETI), which considers authenticity, the preservation of energy and information, and scene expressiveness.

5 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202330
202274
202167
202089
2019120
2018119