Patent ID: 11895335
Assignee: SUN PATENT TRUST
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. An image encoding apparatus which performs encoding involving filtering of image blocks using a plurality of deblocking filters having different filter strengths, the image encoding apparatus comprising:
at least one processor; and
storage accessible by the at least one processor;
the at least one processor executing the following steps using the storage:
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.