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Working with High Dynamic Range Images

A high dynamic range, dynamic range technology, applied in image enhancement, image analysis, image communication, etc.

Active Publication Date: 2019-02-12
INTERDIGITAL CE PATENT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coding HDR images presents various technical challenges

Method used

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  • Working with High Dynamic Range Images
  • Working with High Dynamic Range Images
  • Working with High Dynamic Range Images

Examples

Experimental program
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Embodiment Construction

[0014] As a preview of some of the features presented in this application, at least one implementation describes decomposing an HDR image into an LDR image and an exposure map or look-up table ("LUT"). The LDR image is encoded along with the exposure map or LUT and inserted into the bitstream for transmission or storage. The LDR image and the exposure map can be coded jointly in some way. For example, the exposure map can be encoded based on the reconstruction of the encoded LDR image. A receiver accesses the bitstream, for example, by receiving a transmission with encoded data read from a storage device. The decoder at the receiving end then decodes the LDR image and the exposure map or LUT if present. Based on the decoded information, the receiver reconstructs the HDR image. Various implementations, including exposure map implementations and LUT implementations, are discussed in more detail below.

[0015] Continuing with this preview, various implementations involving e...

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Abstract

Various implementations are directed to high dynamic range ("HDR") images. In one specific implementation, a low dynamic range ("LDR") image is generated from the HDR image, and information is generated that allows reconstruction of the HDR image from the LDR image. Encoding the LDR image and the information. In another implementation, a signal or a signal structure comprises an LDR section comprising an encoded LDR image and an information section comprising encoded information. In another implementation, both encoded LDR images and encoded information are decoded. The HDR image is then reconstructed based on the decoded LDR image and the decoded information.

Description

technical field [0001] Describe implementations involving digital images. Various implementations relate to high dynamic range ("HDR") images. Background technique [0002] Technology is allowing for more complex images (such as, for example, images that can exhibit a greater range of colors or intensities). These images are often referred to as HDR images. In contrast, standard images are often referred to as low dynamic range ("LDR") images. Coding HDR images presents various technical challenges. Contents of the invention [0003] According to a general aspect, a lower dynamic range image is generated from a higher dynamic range. Information allowing reconstruction of the higher dynamic range image is generated from the higher dynamic range image. The lower dynamic range image and the information are encoded. [0004] According to a further general aspect, the signal or signal structure comprises a lower dynamic range segment comprising an encoded lower dynamic ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/50G06T5/00
CPCG06T5/50H04N19/46H04N19/30G06T5/90H04N19/44G06T2207/20208
Inventor 翟杰夫王喆田栋
Owner INTERDIGITAL CE PATENT HLDG