Patent ID: 11949921
Assignee: KONINKLIJKE PHILIPS N.V.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 7:
8. A method of image transformation comprising:
deformatting a video signal so as to obtain a DCT-compressed image and parameter data from an image signal,
wherein the DCT-compressed image comprises pixels,
wherein the pixels have colors,
wherein the colors encode luminances;

decompressing the DCT-compressed image so as to obtain a decompressed image, wherein the decompressing comprises applying at least an inverse DCT transform;
performing dynamic range conversion so as to obtain output colors, wherein the output colors encode output luminances, the performing comprises:
loggamma mapping to each of the colors: and
monotonically increasing arbitrary tone mapping to each of the colors,
wherein monotonically increasing tone mapping uses a portion of the parameter data.