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

Claim 2:
3. An image transformation circuit comprising:
a deformatter circuit,
wherein the deformatter circuit is arranged 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;

a decompressor circuit, wherein the decompressor circuit is arranged to apply an inverse DCT transform to the DCT-compressed image so as to obtain a decompressed image
a dynamic range conversion circuit,
wherein the dynamic range conversion circuit is arranged to transform the decompressed image into a high dynamic range 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 arbitrary monotonically increasing tone mapping is defined by a portion of the parameter data.