High-dynamic range video tone mapping

A high dynamic range, tone mapping technology, applied in digital video signal modification, TV, engine components, etc., can solve problems such as increased implementation cost, limited height of HDR video display, and unusable hardware.

Inactive Publication Date: 2013-08-14
IBM CORP
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  • Claims
  • Application Information

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Problems solved by technology

However, this approach has the disadvantage of potentially degrading tonemapping quality to allow real-time processing, while still requiring high-capacity/high-cost basic hardware for acceptable-quality tonemapping
Also, the hardware i

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Embodiment Construction

[0024] Multimedia devices typically implement video coding technologies, such as MPEG-2, ITU-H.263, MPEG-4, etc., to transmit, receive, store or retrieve digital content. Among these coding techniques, MPEG international standards are extended to compress HDR video streams, such as: "New Standardized Extensions of MPEG4-AVC / H.264 for Professional-Quality Video Applications" (Image Processing, 2007.ICIP2007.IEEE International Conference on , 2007, pp.I-13-I-16, by G.Sullivan, Haoping Yu, S.Sekiguchi, Huifang Sun, T.Wedi, S.Wittmann, Yung-Lyul Lee, A.Segall, and T.Suzuki) Described.

[0025] An MPEG data stream consists of a video stream that can be packaged with an audio stream and other bit streams.

[0026] figure 1 An exemplary MPEG sequence 100 comprising frames captured at intervals is shown. Frames are specified by how time information is encoded.

[0027] MPEG encoding is used to generate a sequence of frames comprising a plurality of frames of different types. More...

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Abstract

A method for tone-mapping a High Dynamic Range (HDR) data video stream encoded in MPEG format, the method comprising decoding the data video HDR data stream to generate decoded I-frames, auxiliary decoded data related to P-Frames, and auxiliary decoded data related to B-Frames, the method further comprising applying a tone mapping function to each decoded I-Frame to provide a tone-mapped I-Frame according to a tone mapping operator, for each P-frame depending on a reference I-frame, computing the tone-mapped P-frame from the tone-mapped I-Frame previously determined for the reference I-frame, the reference I-Frame, and the auxiliary decoding data related to the P-Frame; and, for each B-frame, computing the tone-mapped B-frame from the tone mapped I-frame previously determined for the reference I-frame, the tone mapped P-frame previously determined for the reference P-frame, and the auxiliary decoding data related to the B-Frame.

Description

technical field [0001] The present invention relates generally to high dynamic range (HDR) image processing, and more particularly, to systems and methods for tone mapping an MPEG HDR video stream. Background technique [0002] The quality of digital images has improved dramatically over the past few years. The number of pixels in a picture has increased due to improvements in both cameras and displays. However, with the increase in the number of pixels in a high definition (HD) picture and the improved dynamic information in a high dynamic range (HDR) picture, an increasing amount of data is associated with the picture. This can cause problems with the display of such images. For still images, it is known to apply tone mapping techniques that allow reducing the dynamic range of the picture in a way that attempts to allow the user to observe all the details relevant to the human eye. However, for video data consisting of multiple frames, existing solutions have many limit...

Claims

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Application Information

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IPC IPC(8): G06T5/00H04N7/50H04N7/26
CPCH04N19/00781F02M25/0749H04N19/00903Y02T10/144G06T5/009F02M25/0727Y02T10/16F05D2260/14G06T2207/20208Y02E60/15F05D2240/129F02M25/0707F02M25/0746H04N19/00533F01D9/026F05D2220/40F02M25/0713Y02T10/121F02C6/12F02C6/16F05D2260/60F05D2240/128H04N19/44H04N19/61H04N19/85H04N19/10
Inventor A·H·埃尔-玛迪H·E·埃尔-西西尼
Owner IBM CORP
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