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Method and apparatus for dynamic range expansion of LDR video sequence

A dynamic range extension and video sequence technology, applied in the field of image processing, can solve the problems of no tone mapping information, sensor saturation, over-contrast, etc.

Inactive Publication Date: 2015-12-30
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In case of an LDR video sequence captured by an LDR camera, no tone mapping information is available, therefore, iTMO cannot be used to extend the dynamic range of the LDR video sequence
In addition, there are many situations where insufficient information is available for EO to perform high-fidelity dynamic range extension due to sensor saturation, low lighting, and high contrast in scenarios where LDR video sequences are acquired

Method used

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  • Method and apparatus for dynamic range expansion of LDR video sequence
  • Method and apparatus for dynamic range expansion of LDR video sequence
  • Method and apparatus for dynamic range expansion of LDR video sequence

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Embodiment Construction

[0019] In the following description, for purposes of illustration and not limitation, specific details of specific embodiments of the technology are set forth. One skilled in the art will recognize that other embodiments may be used without these specific details. Furthermore, in some instances, specific descriptions of known methods are omitted so as not to obscure the description with unnecessary detail.

[0020] It should be apparent to those skilled in the art that some or all of the described functions may be implemented using hardware circuits such as analog and / or discrete logic gates, ASICs, PLAs, etc. interconnected together to perform specific functions. Similarly, some or all of the described functions may be implemented by using software programs and data in conjunction with one or more digital microprocessors or general purpose computers.

[0021] now refer to figure 1 In order to describe the method 100 for extending the passband range of an LDR video sequence...

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Abstract

A method and apparatus for dynamic range expansion of an LDR video sequence are suggested. The suggested method comprises the steps of: acquiring the LDR video sequence and at least one HDR panoramas concurrently, determining a dynamic range expansion operator based on the LDR video sequence and the HDR panoramas, and applying the determined dynamic range expansion operator on the LDR video sequence.

Description

technical field [0001] The present disclosure generally relates to the technical field of image processing, and in particular, relates to a method and device for dynamic range extension of a low dynamic range (LDR) video sequence. Background technique [0002] As an enhanced video processing technique for adapting an LDR video sequence to a high dynamic range (HDR) display, a dynamic range extension technique that enables an LDR video sequence to be converted into an HDR video sequence has received widespread attention. The HDR display will represent the physical illuminance (in cd / m 2 ) as input, while the luminance component of a pixel of an LDR video sequence is represented as an integer defined in a standard color space. To avoid confusion, the term luma (luma) is used to denote LDR pixel illuminance. [0003] In order to achieve dynamic range extension, two types of dynamic range extension operators are proposed: extension operator (EO) and inverse tone mapping operat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00H04N23/76
CPCG06T5/50G06T2207/10016G06T2207/20208G06T5/92H04N23/741H04N23/698
Inventor 罗南·伯特德多米尼克·托罗卡迪·布阿图什雷米·科佐穆罕默德·图尔坎
Owner THOMSON LICENSING SA