Coding unit quantization parameters in video coding

A method comprising:

• decoding a first syntax element in a bit stream, wherein the bit stream includes a coded representation of a picture;
• determining, using the first syntax element, a minimum coding block size for which decoding of a quantization parameter (QP) delta is enabled in the picture;
• decoding a second syntax element in the bit stream;
• determining a first QP delta value for a first region in the picture using the second syntax element;
• determining a QP value for the first region using the first QP delta value;
• performing an inverse quantization function on the first region using the QP value;
• and
• performing an inverse transform function on the first region to form a first reconstructed block in the picture after performing the inverse quantization function on the first region.