Method and device for encoding and decoding attenuation map based on green mpeg for energy aware images

A method comprising:

• obtaining an input image of a video;
• determining an attenuation map based on the input image according to a selected energy reduction rate, wherein the attenuation map comprises values representative of a pixel-wise attenuation to be applied to corresponding samples of the image so that applying the attenuation map to the input image reduces values of components of the input image;
• and
• generating an encoded video comprising at least the input image, the attenuation map and a set of parameters, wherein the set of parameters comprises at least a first parameter representative of an operation for applying the attenuation map to an image, and a second parameter representative of an association between components of the attenuation map and components of the image affected by the operation,
• wherein the set of parameters is encoded into a MPEG green metadata SEI message in a section related to attenuation map information and identified by a specific metadata type.

An apparatus comprising a processor configured to:

• obtain encoded data comprising an image, an attenuation map and a set of parameters, wherein the attenuation map comprises values representative of a pixel-wise attenuation to be applied to corresponding samples of the image and the set of parameters comprises at least a first parameter representative of an operation for applying the attenuation map to the image, and a second parameter representative of an association between components of the attenuation map and components of the image affected by the operation;
• apply the attenuation map to the image to reduce values of components of the image by performing an operation determined by the first parameter on components of the image selected based on the second parameter;
• and
• provide an attenuated image,
• wherein the set of parameters is obtained from a MPEG green metadata SEI message in a section related to attenuation map information and identified by a specific metadata type.

An apparatus comprising a processor configured to:

• obtain an input image of a video;
• determine an attenuation map based on the input image according to a selected energy reduction rate, wherein the attenuation map comprises values representative of a pixel-wise attenuation to be applied to corresponding samples of the image so that applying the attenuation map to the input image reduces values of components of the input image;
• and
• generate an encoded video comprising at least the input image, the attenuation map and a set of parameters, wherein the set of parameters comprises at least a first parameter representative of an operation for applying the attenuation map to an image, and a second parameter representative of an association between components of the attenuation map and components of the image affected by the operation,
• wherein the set of parameters is encoded into a MPEG green metadata SEI message in a section related to attenuation map information and identified by a specific metadata type.