Transform precision manipulation in video coding

A video decoding device comprising:

• a memory device configured to store encoded video data;
• and
• processing circuitry coupled to the memory device and being configured to:
• determine that a rectangular transform unit (TU) of the encoded video data stored to the memory device comprises a number of pixel rows denoted by a first integer value ‘K’ and a number of pixel columns denoted by a second integer value ‘L,’ wherein K, when converted to a binary format, represents a binary value equal to an integer value ‘m’ left shifted by one (1), and wherein L, when converted to the binary format, represents a binary value equal to a binary equivalent of an integer value ‘n’ left shifted by one (1);
• determine that a sum of n and m is an odd number;
• based on the sum of n and m being the odd number, add a delta quantization parameter (delta QP) value to a quantization parameter (QP) value for the rectangular TU to obtain a modified QP value for the rectangular TU;
• and
• dequantize the rectangular TU using the modified QP value.

A non-transitory computer-readable storage medium comprising instructions that, when executed, cause processing circuitry of a video decoding device to:

• store encoded video data;
• determine that a rectangular transform unit (TU) of the encoded video data stored to the non-transitory computer-readable storage medium comprises a number of pixel rows denoted by a first integer value ‘K’ and a number of pixel columns denoted by a second integer value ‘L,’ wherein K, when converted to a binary format, represents a binary value equal to an integer value ‘m’ left shifted by one (1), and wherein L, when converted to the binary format, represents a binary value equal to a binary equivalent of an integer value ‘n’ left shifted by one (1);
• determine that a sum of n and m is an odd number;
• based on the sum of n and m being the odd number, add a delta quantization parameter (delta QP) value to a quantization parameter (QP) value for the rectangular TU to obtain a modified QP value for the rectangular TU;
• and
• dequantize the rectangular TU using the modified QP value.