Patent ID: 9282329
Filing Date: 2016-03-08
CPC Classification: H04N

Claim Text:
1. A method of decoding a bitstream of compressed data, the method comprising: decoding the compressed data to obtain a plurality of quantized transform coefficients; for a quantization index, counting the number of non-zero quantized transform coefficients associated with the quantization index; if a count of the number of non-zero quantized transform coefficients associated with the quantization index exceeds a threshold value, then decoding offset data for the quantization index; decoding average offset data associated with two or more quantization indices that are different from the quantization index; calculating a reconstruction level for the quantization index by adjusting a predetermined reconstruction level using the offset data; calculating a respective reconstruction level for each of the two or more quantization indices by adjusting respective predefined reconstruction levels using the average offset data; and dequantizing each quantized transform coefficient that corresponds to a respective quantization index to generate a data point using that quantization index's respective calculated reconstruction level.