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

Claim 0:
1. An image transformation circuit comprising:
a deformatter circuit,
wherein the deformatter circuit is arranged to obtain a DCT-compressed input image and parameter data from an input image signal,
wherein the DCT-compressed input image comprises pixels which have colors which encode input luminances;

a decompressor circuit, wherein the decompressor circuit is arranged to apply at least an inverse DCT transform to the DCT-compressed input image to obtain a decompressed input image
a dynamic range conversion circuit,
wherein the dynamic range conversion circuit is arranged to transform the decompressed input image into a high dynamic range output image,
wherein the dynamic range conversion circuit comprises:
a loggamma conversion circuit, wherein the loggamma conversion circuit is arranged to apply a loggamma mapping, and
an arbitrary tone mapping circuit,
wherein the arbitrary tone mapping circuit is arranged to apply an arbitrary monotonically increasing tone mapping,

wherein the parameters which define the arbitrary monotonically increasing tone mapping are received in the parameter data; and
wherein loggamma conversion circuit and the arbitrary tone mapping circuit are connected.