3.1.8.1.6 Summary of Terms
DwtQ: A tile after DWT transformation and quantization.
DwtQ-LL: The LL3 band of DwtQ.
DwtQ-NonLL: The non-LL3 bands of DwtQ.
DwtQ-LL-Deltas: The difference between two consecutive LL3 elements from DwtQ.
Ref: The reference tile, which reflects the current DWT/quantized bits of the decoder.
Diff, Diff-LL, Diff-NonLL: The difference between Ref and DwtQ of the current tile.
SB: The result of the sub-band diffing decision engine.
BitPos: A function that returns a bit position used for progressive encoding.
PQF: The Progressive Quantization Factor, defined as (1 << BitPos).
ProgQ: Data from SB that has been "extra quantized" using PQF.