Image decoding device which generates a predicted image of a target prediction unit

1. An image decoding device comprising:

a processor, and

a memory associated with the processor; wherein

the processor executes instructions stored on the memory to perform:

deriving an illumination compensation flag indicating whether illumination compensation is executed; and

generating a predicting image of a target prediction unit using illumination change parameters derived from a target image and a reference image in a case where the illumination compensation flag is a value indicating that illumination compensation is executed;

deriving a specific merge index illumination compensation skip flag;

determining whether or not the target prediction unit which is a generation target of the predicted image is in a merge mode and a merge index is a predetermined value;

determining whether or not the specific merge index illumination compensation skip flag is valid; and

decoding the illumination compensation flag from coded data based on results of the determining.

2. The image decoding device according to claim 1 , wherein the processor further executes the instructions stored on the memory to decode the specific merge index illumination compensation skip flag from a slice header.

3. The image decoding device according to claim 1 , wherein the processor further executes the instructions stored on the memory to decode the illumination compensation flag from the coded data in a case where the prediction unit is not in the merge mode and a reference picture of the prediction unit indicates interview prediction.