Frequency Quantization for Video Encoding Precision

The patent performs frequency transformation on full-precision pixel values before quantization, rather than converting to lower bit depths first. This preliminary action on high-precision data ensures that frequency coefficients are calculated with maximum accuracy, avoiding the data loss that would occur from premature bit depth reduction. The full-precision frequency coefficients are then quantized in a controlled manner that preserves encoding accuracy while maintaining efficiency.

The patent changes the order and timing of parameter conversions in the encoding process. Instead of converting pixel bit depth early, the system maintains full precision through the frequency transformation stage and only applies quantization (parameter reduction) after frequency coefficients are generated. This parameter change strategy allows the use of standard frequency transformation algorithms without modification while achieving high precision, as the full-precision input values ensure accurate frequency coefficient calculation even with conventional transform implementations.

The patent extracts and processes only the essential full-precision information needed for accurate frequency transformation, rather than maintaining full precision throughout the entire encoding pipeline. By performing frequency transformation on full-precision values and then quantizing the resulting frequency coefficients, the system extracts the most important high-precision data (frequency coefficients) while discarding redundant information. This extraction approach maintains encoding accuracy where it matters most while controlling the overall data volume through subsequent quantization and compression.