Patent
Methods and apparatuses for encoding an HDR images, and methods and apparatuses for use of such encoded images
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TLDR
In this article, a method of encoding a high dynamic range image (M_HDR) comprising the steps of: - converting the high-dynamic range image into a low-luminance dynamic-range image (LDR_o) by applying: a) normalization of the image of high-D range at a luma axis scale that is [0, 1] giving a high normalized DRL image with normalized colors that have normalized luminance (Yn_HRL), b) calculate a gamma function on normalized luminances giving converted luminance withAbstract:
A method of encoding a high dynamic range image (M_HDR), comprising the steps of: - converting the high dynamic range image into a low luminance dynamic range image (LDR_o) by applying: a) normalization of the image of high dynamic range at a luma axis scale that is [0, 1] giving a high normalized dynamic range image with normalized colors that have normalized luminance (Yn_HDR), b) calculate a gamma function on normalized luminance giving converted luminance with gamma (xg), c) apply a first tone mapping that gives lumas (v) that is defined as ** Formula **, with RHO having a predetermined value, and d) apply a monotonously increasing arbitrary tone mapping function that maps the lumas with output lumas (Yn_LDR) of the lower dynamic range image (LDR_o); and - emit, in an image signal (S_im), an encoding of the pixel colors of the lower luminance dynamic range image (LDR_o), and - emit, in the image signal (S_im), values encoding the function forms of previous color conversions bad as metadata, or values for their inverse functions, metadata that allow a receiver to reconstruct a reconstructed high dynamic range image (Rec_HDR) from the low luminance dynamic range image (LDR_o ), where RHO or a value that is a function of RHO is issued in the metadata.read more
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Patent
Image Processing Method and Apparatus
TL;DR: In this article, an image processing method and apparatus are provided to collect at least two exposure frames with different brightness in a same scene during different exposure time; combining, for each exposure frame, a raw data unit arranged repeatedly in the exposure frame to obtain first brightness data after the combining; acquiring a correction parameter of all exposure frames according to all first brightness values; and performing weighting processing on all the exposure frames by using the correction parameter to obtain a high dynamic range image of corrected raw data.
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Content-adaptive application of fixed transfer function to high dynamic range (HDR) and/or wide color gamut (WCG) video data
Dmytro Rusanovskyy,Sungwon Lee,Done Bugdayci Sansli,Joel Sole Rojals,Adarsh Krishnan Ramasubramonian,Marta Karczewicz +5 more
TL;DR: In this paper, the authors apply pre-processing of color values prior to application of a static transfer function and/or apply post-processing on the output from the application of the static transfer functions.
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Apparatus and method for outputting content, and display apparatus
TL;DR: An apparatus for outputting a content to a display, including a communicator configured to perform a data communication with the display, an input interface configured to receive an input content and metadata associated with the input content, and a processor configured to acquire image quality information applied to the content based on the metadata, to convert the input contents into a converted content outputtable on the display by using content conversion information related to the acquired image-quality information, and to control the communicator to output the converted content to the display as mentioned in this paper.
References
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Book
High Dynamic Range Imaging: Acquisition, Display, and Image-Based Lighting
TL;DR: The Human Visual System and HDR Tone Mapping and Frequency Domain and Gradient Domain Tone Reproduction and an Image-Based Lighting List of Symbols References Index are presented.
Patent
Apparatus and method for dynamic range transforming of images
TL;DR: In this article, a dynamic range transform is applied to the encoded image in response to the display dynamic range indication, which can be used to generate an improved High Dynamic Range image from e.g. a Low Dynamic Range (LDR) image, or vice versa.
Patent
Encoding, decoding, and representing high dynamic range images
TL;DR: In this article, a tone mapped image with HDR reconstruction data in the form of luminance ratios and color residual values is encoded and decoded to generate a restored HDR image free of the color alterations.
Patent
Compatible compression of high dynamic range, visual dynamic range, and wide color gamut video
TL;DR: In this paper, a first image stream has a first dynamic range and a first color space, and a second image stream is encoded to obtain an encoded image stream, which is decoded to obtain a decoded image stream.
Patent
High dynamic range codecs
TL;DR: In this paper, a method for encoding high dynamic range (HDR) images involves providing a lower dynamic range image, generating a prediction function for estimating the values for pixels in the HDR image based on the values of corresponding pixels in LDR image, and obtaining a residual frame based on differences between the pixel values of HDR image and estimated pixel values.