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Proceedings ArticleDOI

Adaptive tone-mapping operator for HDR images based on image statistics

01 Nov 2011-pp 1435-1438
TL;DR: A novel segmentation method for displaying high dynamic range image based on K-means clustering that is faster than other local tone mapping operators and improves an image rendering performance in terms of dark area details and contrast enhancement.
Abstract: In this paper, we present a novel segmentation method for displaying high dynamic range image based on K-means clustering. The new segmentation method uses statistical features of an image in a logarithmic luminance domain. Each divided region is applied to different global tone mapping operators respectively. The global tone mapping operator is a logarithmic tone mapping with a different user parameters. The parameters for applying to each region are calculated using a centroid which is obtained from K-means clustering. According to results of many HDR image experiments, we demonstrate that our method is faster than other local tone mapping operators and improves an image rendering performance in terms of dark area details and contrast enhancement.
Citations
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Patent
25 Mar 2014
TL;DR: In this article, a set of image blocks of non-zero standard deviations in VDR code words in at least one input VDR image is constructed, and a candidate set of function parameter values for a mapping function is selected from multiple candidate sets.
Abstract: Input VDR images are received. A candidate set of function parameter values for a mapping function is selected from multiple candidate sets. A set of image blocks of non-zero standard deviations in VDR code words in at least one input VDR image is constructed. Mapped code values are generated by applying the mapping function with the candidate set of function parameter values to VDR code words in the set of image blocks in the at least one input VDR image. Based on the mapped code values, a subset of image blocks of standard deviations below a threshold value in mapped code words is determined as a subset of the set of image blocks. Based at least in part on the subset of image blocks, it is determined whether the candidate set of function parameter values is optimal for the mapping function to map the at least one input VDR image.

33 citations

Proceedings ArticleDOI
01 Dec 2015
TL;DR: Experimental results demonstrate that the proposed detail-preserving tone mapping for low dynamic range displays with adaptive gamma correction significantly enhances fine details of images as well as successfully preserves the overall image quality.
Abstract: Tone mapping effectively produces high dynamic range images on low dynamic range displays. Global tone mapping is simple and fast because of using the same mapping curve for every pixel without considering its neighboring ones in the radiance map. However, it often loses fine details in an image with low dynamic range displays. In this paper, we propose detail-preserving tone mapping for low dynamic range displays with adaptive gamma correction. We first perform global logarithmic tone mapping to reproduce natural tone for low dynamic range displays. Although global logarithmic mapping effectively considers human perceptual abilities, it often loses some details especially in dark regions. Thus, we perform adaptive gamma correction to achieve local contrast enhancement. Experimental results demonstrate that the proposed method significantly enhances fine details of images as well as successfully preserves the overall image quality.

6 citations


Cites background from "Adaptive tone-mapping operator for ..."

  • ...This discrepancy causes the tone reproduction problem to map the scene luminance into the display luminance while preserving the contrasts and details in the dark and bright regions [1], called tone mapping (TM)....

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Proceedings ArticleDOI
08 Oct 2015
TL;DR: Experimental results show that the proposed algorithm efficiently increases the local contrast while preventing “halo” effect and provides a good rendition of visual effect.
Abstract: Tone mapping can be used to compress the dynamic range of the image data such that it can be fitted within the range of the reproduction media and human vision. The original infrared images that captured with infrared focal plane arrays (IFPA) are high dynamic images, so tone mapping infrared images is an important component in the infrared imaging systems, and it has become an active topic in recent years. In this paper, we present a tone mapping framework using multi-scale retinex. Firstly, a Conditional Gaussian Filter (CGF) was designed to suppress "halo" effect. Secondly, original infrared image is decomposed into a set of images that represent the mean of the image at different spatial resolutions by applying CGF of different scale. And then, a set of images that represent the multi-scale details of original image is produced by dividing the original image pointwise by the decomposed image. Thirdly, the final detail image is reconstructed by weighted sum of the multi-scale detail images together. Finally, histogram scaling and clipping is adopted to remove outliers and scale the detail image, 0.1% of the pixels are clipped at both extremities of the histogram. Experimental results show that the proposed algorithm efficiently increases the local contrast while preventing “halo” effect and provides a good rendition of visual effect.

3 citations


Cites methods from "Adaptive tone-mapping operator for ..."

  • ...Literature [3] presented an adaptive tone-mapping method for high dynamic range images; the image is divided into K different regions using a K-means clustering....

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01 Jan 2014
TL;DR: Here an objective evaluation technique is used which takes both Structural Fidelity as well as Statistical Naturalness measure to obtain the maximum possible quality obtainable from these tone mapping operator.
Abstract: The use of photography and the application of the resultant picture has become vital in such a way that the picture should express all the information present in the environment. This is not possible unless Tone Mapping Operators (TMOs) are used. It converts the High Dynamic Range (HDR) image into an equivalent Low Dynamic Range (LDR) image with as much information possible. The method used to measure the quality of the Tone Mapping Operator is mostly subjective thereby an optimization framework is not possible. Here an objective evaluation technique is used which takes both Structural Fidelity as well as Statistical Naturalness measure. The results are verified by cross checking against the Subjective Evaluation scores. It is attached as an optimization framework to Gamma Tone Mapping operator to obtain the maximum possible quality obtainable from these tone mapping operator.
Journal ArticleDOI
TL;DR: An algorithm for the tone mapping of high dynamic range (HDR) scenes in digital CMOS pixels has been developed, which produces a representation of several decades of acquired data while keeping the main contents in the scene using only 7-bits/pixel.
Abstract: An algorithm for the tone mapping of high dynamic range (HDR) scenes in digital CMOS pixels has been developed. The algorithm performs a content-aware compression over HDR scenes, which produces a representation of several decades of acquired data while keeping the main contents in the scene using only 7-bits/pixel.
References
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Book
28 May 2010
TL;DR: The Human Visual System and HDR Tone Mapping and Frequency Domain and Gradient Domain Tone Reproduction and an Image-Based Lighting List of Symbols References Index are presented.
Abstract: Foreword Preface 1 Introduction 2 Light And Color 3 HDR Image Encodings 4 HDR Image Capture 5 Display Devices 6 The Human Visual System and HDR Tone Mapping 7 Spatial Tone Reproduction 8 Frequency Domain and Gradient Domain Tone Reproduction 9 Image-Based Lighting List of Symbols References Index

1,484 citations


"Adaptive tone-mapping operator for ..." refers background in this paper

  • ...The local operators, however, have classic problems to determine how many neighboring pixels need to be included in the computation, how to weight each neighboring pixel’s contribution to the local adaptation level, and how to use this adaptation level within a compressive function.[1] Because of these issues, it cannot be executed in real time....

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  • ...Human vision response L’ versue brightness stimulus [1]...

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  • ..., a constant ratio of change rather than a constant increment.[1] Because the human eye’s sensitivity to light is not linear as shown in Figure 3, the segmentation of an image is processed in logarithm luminance domain....

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Proceedings ArticleDOI
01 Jul 2002
TL;DR: The results demonstrate that the method is capable of drastic dynamic range compression, while preserving fine details and avoiding common artifacts, such as halos, gradient reversals, or loss of local contrast.
Abstract: We present a new method for rendering high dynamic range images on conventional displays. Our method is conceptually simple, computationally efficient, robust, and easy to use. We manipulate the gradient field of the luminance image by attenuating the magnitudes of large gradients. A new, low dynamic range image is then obtained by solving a Poisson equation on the modified gradient field. Our results demonstrate that the method is capable of drastic dynamic range compression, while preserving fine details and avoiding common artifacts, such as halos, gradient reversals, or loss of local contrast. The method is also able to significantly enhance ordinary images by bringing out detail in dark regions.

1,441 citations


"Adaptive tone-mapping operator for ..." refers background in this paper

  • ...A logarithmic tone-mapping operator is the representative global operator and a gradient algorithm [8] is the representative operator processed in the frequency domain....

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Journal ArticleDOI
TL;DR: A new method for rendering high dynamic range images on conventional displays that is conceptually simple, computationally efficient, robust, and easy to use is presented.
Abstract: We present a new method for rendering high dynamic range images on conventional displays. Our method is conceptually simple, computationally efficient, robust, and easy to use. We manipulate the gr...

557 citations

Proceedings ArticleDOI
TL;DR: In this paper, a review of tone reproduction curves (TRCs) and tone reproduction operators (TROs) is presented, which operate pointwise on the image data, making the algorithms simple and efficient.
Abstract: In this paper, we review several algorithms that have been proposed to transform a high dynamic range image into a reduced dynamic range image that matches the general appearance of the original. We organize these algorithms into two categories: tone reproduction curves (TRCs) and tone reproduction operators (TROs). TRCs operate pointwise on the image data, making the algorithms simple and efficient. TROs use the spatial structure of the image data and attempt to preserve local image contrast.

185 citations

Journal ArticleDOI
TL;DR: A global histogram adjustment based tone mapping operator is presented, which well reproduces global contrast for high dynamic range images and adaptive contrast adjustment is carried out using this operator in the local regions to reproduce local contrast and ensure better quality.

142 citations


"Adaptive tone-mapping operator for ..." refers background or methods in this paper

  • ...However, the offset τ can be solved using numerical calculation with iterations in the majority of previous study like as [3]....

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  • ...[3] It is important to determine the appropriate τ value for the divided regions....

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