Systems and methods for deriving quantization parameters for video blocks in video coding

A method of decoding of image data, the method comprising:

• deriving a predicted luma quantization parameter by using a tree type specifying whether a single tree or a dual tree is used to partition a coding tree;
• and
• generating a luma quantization parameter by using the predicted luma quantization parameter, wherein:
• the predicted luma quantization parameter is set equal to a luma quantization parameter of a coding unit containing a luma coding block covering a neighboring location when a first condition of a current quantization group is true and a second condition of a neighboring block availability is true, and
• the neighboring location is located above the current quantization group.

A device comprising:

• one or more processors;
• and
• one or more non-transitory computer-readable media coupled to the one or more processors and storing one or more computer-executable instructions that, when executed by at least one of the one or more processors, cause the device to:
• derive a predicted luma quantization parameter by using a tree type specifying whether a single tree or a dual tree is used to partition a coding tree;
• and
• generate a luma quantization parameter by using the predicted luma quantization parameter, wherein:
• the predicted luma quantization parameter is set equal to a luma quantization parameter of a coding unit containing a luma coding block covering a neighboring location when a first condition of a current quantization group is true and a second condition of a neighboring block availability is true, and
• the neighboring location is located above the current quantization group.