| CPC H04N 19/124 (2014.11) [H04N 19/184 (2014.11)] | 18 Claims |
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1. A method of encoding an input signal into a plurality of encoded streams, wherein the encoded streams may be combined to reconstruct the input signal, the method comprising:
receiving an input signal;
downsampling the input signal to create a downsampled signal;
instructing an encoding of the downsampled signal using a base encoder to create a base encoded stream;
instructing a decoding of the base encoded stream using a base decoder to generate a reconstructed signal;
comparing the reconstructed signal to the input video to create a set of residuals; and,
encoding the set of residuals to create a level encoded stream, including:
applying a transform to the set of residuals to create a set of transformed coefficients;
applying a quantization operation to the set of transformed coefficients to create a set of quantized coefficients,
the quantization operation comprising using a quantization offset, and wherein the offsets for all quantization step widths are derived from a reference step width according to the relationship:
Dequantization_Offsetk=f(StepWidthk),
and the relationship:
Actual_Dequantization_Offseti==Reference_Dequantization_Offset+f(StepWidthi)−f(Reference StepWidth); and
applying an encoding operation to the quantized coefficients.
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