公开(公告)号：US11727548B2

公开(公告)日：2023-08-15

申请号：US16784124

申请日：2020-02-06

Applicant: InterDigital VC Holdings, Inc.

Inventor： Mikael Le Pendu ,  Ronan Boitard ,  Christine Guillemot ,  Dominique Thoreau

IPC: C10G5/00 ,  C10G45/58 ,  C10G2/00 ,  C10G47/00 ,  C10G49/00 ,  C10G67/00 ,  G06T5/00 ,  G06T5/40 ,  H04N19/147 ,  H04N19/186 ,  H04N19/30 ,  H04N19/117 ,  H04N19/126 ,  H04N19/184 ,  H04N19/44 ,  H04N19/91

CPC classification number: G06T5/009 ,  G06T5/40 ,  H04N19/117 ,  H04N19/126 ,  H04N19/147 ,  H04N19/184 ,  H04N19/186 ,  H04N19/30 ,  H04N19/44 ,  H04N19/91 ,  G06T2207/10024 ,  G06T2207/20208

Abstract: To encode High Dynamic Range (HDR) images, the HDR images can be converted to Low Dynamic Range (LDR) images through tone mapping operation, and the LDR images can be encoded with an LDR encoder. The present principles formulates a rate distortion minimization problem when designing the tone mapping curve. In particular, the tone mapping curve is formulated as a function of the probability distribution function of the HDR images to be encoded and a Lagrangian multiplier that depends on encoding parameters. At the decoder, based on the parameters indicative of the tone mapping function, an inverse tone mapping function can be derived to reconstruct HDR images from decoded LDR images.

公开(公告)号：US10650501B2

公开(公告)日：2020-05-12

申请号：US15122149

申请日：2015-02-23

Applicant: InterDigital VC Holdings, Inc.

Inventor： Mikael Le Pendu ,  Ronan Boitard ,  Dominique Thoreau ,  Christine Guillemot

IPC: G06K9/00 ,  G06T5/00 ,  G06T5/40 ,  H04N19/147 ,  H04N19/186 ,  H04N19/30 ,  H04N19/117 ,  H04N19/126 ,  H04N19/184 ,  H04N19/44 ,  H04N19/91

Abstract: To encode High Dynamic Range (HDR) images, the HDR images can be converted to Low Dynamic Range (LDR) images through tone mapping operation, and the LDR images can be encoded with an LDR encoder. The present principles formulates a rate distortion minimization problem when designing the tone mapping curve. In particular, the tone mapping curve is formulated as a function of the probability distribution function of the HDR images to be encoded and a Lagrangian multiplier that depends on encoding parameters. At the decoder, based on the parameters indicative of the tone mapping function, an inverse tone mapping function can be derived to reconstruct HDR images from decoded LDR images.