Tone mapping

About: Tone mapping is a research topic. Over the lifetime, 1713 publications have been published within this topic receiving 48490 citations.

Dual Prominence of Tone Mapping: A Case of Tone Movement

Abstract: The present paper proposes a theory of dual prominence in tone mapping. Evidence is drawn from tone movement observed in the lexical tone sandhi of the Chinese Zhenhai dialect. In this theory, two prominent positions, prosodic edge and metrical head, are singled out in phonology. They are referred to by both positional faithfulness and positional markedness constraints in an Optimality-Theoretic analysis of tone movement. Most tone sandhi processes in Chinese Wu dialects are characterized as deletion of tones on unstressed syllables, followed by spreading (or re-association) of the tone on the stressed syllable in a tone sandhi domain. An often-cited example is New Shanghai, which has five lexical tones, three long tones and two short checked tones (marked by ). Its tone inventory is given in (1):

Tone mapping via edge-preserving total variation model

Abstract: The purpose of tone mapping is making a high dynamic range image to be a low dynamic range image and to be displayed in the traditional monitors. Specifically, while a high dynamic range image is being compressed, its details must be preserved as many as possible without artifacts. At present, many tone mapping operators obtain good effects through combining edge-preserving filters with image decomposition. In this paper, we present a tone mapping operator based on an edge-preserving total variation model. We introduce the edge preservation of the total variation model and that how to do the tone mapping using it and the two-scale decomposition of a image. Finally, we demonstrate the effectiveness of our method by comparing it with four other tone mapping operators.

Tone mapping method for dynamic range image

Abstract: A tone mapping method for dynamic range image includes receiving a first image having a first dynamic range. A color information and a luminance information of the image is split out. According to the luminance information, a luminance gradient of the first image is calculated out. An iteration luminance adjusting step is performed to obtain a compressed luminance information. The compressed luminance information and the color information are combined to produce a second image having a second dynamic range. The first dynamic range is larger than the second dynamic range.

Lossless Bit Depth Scalable Coding for Floating Point Images

Abstract: This paper presents a two-layer lossless bit depth scalable coding for RGB color components of high dynamic range (HDR) images. We introduce a two-stage tone mapping, which is composed of a reversible logarithmic mapping and its compensation, to produce a tone mapped LDR image in the base layer. Adding bit stream in the enhancement layer, which carries difference between the original HDR image and its approximation, the original HDR image is reproduced without any loss. The reversible logarithmic mapping is utilized to reduce bit depth of the enhancement layer for lossless coding. We have confirmed that the proposed method significantly reduces bit depth and bit rate of HDR color images in the enhancement layer.

Ambient and content adaptive pixel manipulation

Abstract: Systems, methods, and computer readable media to improve the operation of display systems are described herein. In general, techniques are disclosed for ambient and content adaptive local tone mapping operations that improve display readability under bright ambient light conditions. More particularly, techniques disclosed herein improve contrast and brightness of dark image content while preserving bright areas. The disclosed architecture and operational methodologies generate high contrast images (e.g., amplifying dark regions while preserving bright content), preserve uniform backgrounds (e.g., static background pixels), are stabile in the face of local and global histogram changes (e.g., background not affected by small moving objects such as a mouse pointer), and provide near seamless fade-in and fad-out transitions.