CPC H04N 19/61 (2014.11) [H04N 19/117 (2014.11); H04N 19/139 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/82 (2014.11); H04N 19/86 (2014.11)] | 3 Claims |
1. An image encoding method involving filtering of image blocks using a plurality of deblocking filters having different filter strengths, the image encoding method comprising:
a first calculating step of calculating a boundary strength between two adjacent image blocks;
a second calculating step of calculating a parameter indicating an output range for each of the deblocking filters, using a linear sum of the boundary strength and a quantization parameter;
a selecting step of selecting a deblocking filter to be used in the filtering from among the deblocking filters, using one or more threshold values which are determined based on the parameter;
a filtering step of filtering the two blocks using the selected deblocking filter; and
an encoding step of encoding an image using a reconstructed image including the filtered two blocks,
wherein a value of the parameter to be calculated is larger when a value of the boundary strength is larger.
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