Method for inverse tone mapping of an image

一种色调映射、图像的技术，应用在高动态范围成像领域，能够解决不提供图像外观的充分控制等问题

Active Publication Date: 2016-08-10
INTERDIGITAL CE PATENT HLDG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the simplest case, clipped regions in the image can be detected and then expanded using a steep extension curve, but such schemes do not provide sufficient control over the appearance of the image

Method used

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  • Method for inverse tone mapping of an image
  • Method for inverse tone mapping of an image
  • Method for inverse tone mapping of an image

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Embodiment Construction

[0046] The functions of the various elements shown in the figures may be provided by the use of dedicated hardware as well as hardware capable of executing the associated software in combination with appropriate software.

[0047] It should be understood that the present invention can be implemented in various forms of hardware, software, firmware, special purpose processors or combinations thereof. The term "processor" should not be construed to refer exclusively to hardware capable of executing software, and may implicitly include, but is not limited to: digital signal processor ("DSP") hardware, read-only memory ("ROM") for storing software ”), random access memory (“RAM”), and non-volatile storage devices. It is obvious that the present invention can be realized as a combination of hardware and software. Furthermore, software can be implemented as an application program tangibly embodied on a program storage unit. Such software may take the form of a plug-in to be integr...

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Abstract

Method comprising, for each pixel, obtaining a pixel expansion exponent value (E'(p)) by low pass filtering luminance values of colors of pixels in its spatial neighborhood, obtaining a pixel luminance-enhancement value (Yenhance(p)) by extraction of high frequencies of luminance values of colors of pixels in its spatial neighborhood, and then inverse tone mapping the luminance (Y(p)) according to the equation Yexp(p) = Y(p)E'(p)x [Yenhance(p)]c.

Description

technical field [0001] The present invention relates to the field of high dynamic range imaging and in particular addresses extending the dynamic range of low dynamic range content to make these content ready for display by display devices with particularly high peak brightness. Background technique [0002] Recent developments in display technology have begun to allow an extended range of colors, brightness and contrast to be displayed. [0003] A technique that allows for the extension of the range of brightness or brightness of image content is known as high dynamic range imaging, often abbreviated as HDR. HDR technology focuses on capturing, processing and displaying content with a wider dynamic range. [0004] While some HDR display devices have emerged, and image cameras have been developed capable of capturing images with increased dynamic range, available HDR content is still very limited. While recent developments promise native capture of HDR content in the near ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/57G06T5/00H04N5/235
CPCH04N5/57H04N21/4318G06T2207/20064G06T2207/20208G06T7/90H04N23/741G06T5/94G06T5/90G06T2207/20024
Inventor 塔尼亚·波利艾瑞克·莱因哈德克里斯特尔·查玛雷特
Owner INTERDIGITAL CE PATENT HLDG
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