Patent
Methods and apparatuses for encoding hdr images
Reads0
Chats0
TLDR
In this article, an encoder for encoding an input high dynamic range video set of images (Im_5000), having pixel colors with luminances lower than a first maximum luminance (L_max_M), into an encoded high-dynamic range video (im_2000), being a high-dimensional range image.Abstract:
To enable future video transmission of a large range of HDR videos, and render them on displays of variable dynamic range or peak brightness capability, we describe an encoder (301) for encoding an input high dynamic range video set of images (Im_5000), having pixel colors with luminances lower than a first maximum luminance (L_max_M), into an encoded high dynamic range video (Im_2000), being a high dynamic range image, i.e. with a maximum luminance for displaying on a display with a corresponding peak brightness of at least 900 nit, being characterized in that the encoding definition allows encoding pixel color luminances up to a second maximum luminance (L_max_C), which is equal to or less than 50% of the first maximum luminance, the encoder comprising: a re-grading unit (320) arranged to allow a content creator to specify at least a tone mapping function (F_2Tu, 601) for color mapping the encoded high dynamic range video (Im_2000) of lower second maximum luminance (L_max_C) to a HDR video reconstruction (Im_5000*) of the high dynamic range video (Im_5000); and a formatter, arranged to write into a video signal (S_im) the encoded high dynamic range video (Im_2000) and as metadata the at least a tone mapping function (F_2Tu, 601), and related encoder and decoder embodiments and methods, and transmission technical components and technologies.read more
Citations
More filters
Patent
Methods and apparatuses for encoding an HDR images, and methods and apparatuses for use of such encoded images
TL;DR: 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 with
Patent
System for coding high dynamic range and wide color gamut sequences
TL;DR: In this article, a method of encoding a digital video data applies adaptive preprocessing to data representing high dynamic range (HDR) and/or wide color gamut (WCG) image data prior to encoding and complementary post-processing to the data after decoding in order to allow at least partial reproduction of the HDR and WCG data.
Patent
Method for encoding, video processor, method for decoding, video decoder
TL;DR: In this article, the video signal is transmitted over the interface between VPS and display, and the display subject the image to an adaptation dependent on the video/overlay pixel indication (A).
Patent
Content-adaptive adjustments to tone mapping operations for high dynamic range content
TL;DR: In this article, a playback system can adjust a tone mapping function used when rendering HDR content, thereby improving quality when rendering the HDR content. But the tone mapper is configured to apply tone mapping to input values for the sample values of the picture of HDR content and thereby produce output values.
Patent
Content-adaptive adjustment of display device brightness levels when rendering high dynamic range content
TL;DR: In this article, a playback system can dynamically and proactively adjust the brightness level of a target display device, without any noticeable degradation in quality, in some cases, this can reduce power consumption when rendering HDR content.
References
More filters
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
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.
Patent
Apparatuses and methods for hdr image encoding and decoding
TL;DR: In this article, an image encoding unit (301) arranged to encode a high dynamic range image (IM_HDR-in) comprising: -an LDR selector (311) for identifying a low dynamic range of luminances (R_Norml_LDR) or corresponding range of luma code values within the total range of lumae covered by the high-dynamic range image; -a HDR selector for selecting at least one complementary range (R _ above) within the sum luminae of the two images.
Patent
Apparatus and Methods for Encoding, Decoding and Representing High Dynamic Range Images
TL;DR: In this article, a data structure defining a high dynamic range image consisting of a tone map having a reduced dynamic range and HDR information is defined, which can be reconstructed from the tone map and the HDR information.