Image processing device and image processing method

An image processing method comprising:

• decoding a bitstream to generate a decoded image;
• deciding, in a case where a chroma format is a 422 format, whether or not a deblocking filter is applied to chroma pixels neighboring a vertical block boundary of 4 pixels by using chroma pixels belonging to first and fourth horizontal lines within the vertical block boundary and deciding, in a case where a chroma format is a 444 format, whether or not the deblocking filter is applied to chroma pixels neighboring a vertical block boundary of 4 pixels by using chroma pixels belonging to the first and fourth horizontal lines within the vertical block boundary and deciding whether or not the deblocking filter is applied to chroma pixels neighboring a horizontal block boundary of 4 pixels by using chroma pixels belonging to first and fourth vertical lines within the horizontal block boundary;
• and
• applying the deblocking to the chroma pixels for which it is decided by the processing circuitry that the deblocking filter is applied.

An image processing device comprising:

• a decoder configured to decode a bitstream to generate a decoded image;
• processing circuitry configured to, in a case where a chroma format is a 422 format, decide whether or not a deblocking filter is applied to chroma pixels neighboring a vertical block boundary of 8 pixels by using chroma pixels belonging to first, fourth, fifth, and eighth horizontal lines within the vertical block boundary and to, in a case where a chroma format is a 444 format, decide whether or not the deblocking filter is applied to chroma pixels neighboring a vertical block boundary of 8 pixels by using chroma pixels belonging to the first, fourth, fifth, and eighth horizontal lines within the vertical block boundary and decide whether or not the deblocking filter is applied to chroma pixels neighboring a horizontal block boundary of 4 pixels by using chroma pixels belonging to first, fourth, fifth, and eighth vertical lines within the horizontal block boundary;
• and
• a filter configured to apply the deblocking to the chroma pixels for which it is decided by the processing circuitry that the deblocking filter is applied.

An image processing method comprising:

• decoding a bitstream to generate a decoded image;
• deciding, in a case where a chroma format is a 422 format, whether or not a deblocking filter is applied to chroma pixels neighboring a vertical block boundary of 8 pixels by using chroma pixels belonging to first, fourth, fifth, and eighth horizontal lines within the vertical block boundary and deciding, in a case where a chroma format is a 444 format, whether or not the deblocking filter is applied to chroma pixels neighboring a vertical block boundary of 8 pixels by using chroma pixels belonging to the first, fourth, fifth, and eighth horizontal lines within the vertical block boundary and deciding whether or not the deblocking filter is applied to chroma pixels neighboring a horizontal block boundary of 4 pixels by using chroma pixels belonging to first, fourth, fifth, and eighth vertical lines within the horizontal block boundary;
• and
• applying the deblocking to the chroma pixels for which it is decided by the processing circuitry that the deblocking filter is applied.