Method and apparatus of advanced deblocking filter in video coding

An apparatus for de-blocking filtering of reconstructed picture in a video decoder, the apparatus comprising one or more electronics or processors arranged to:

• receive a video bitstream comprising coded data for a current picture;
• derive, from the video bitstream, reconstructed blocks for the current picture;
• determine, from the video bitstream, one or more first parameter sets associated with a de-blocking filter corresponding to a luma component;
• determine, from the video bitstream, one or more second parameter sets associated with a de-blocking filter corresponding to and one or more chroma components;
• apply the de-blocking filters to boundaries of the reconstructed blocks using said one or more first and second parameter sets to generate de-blocked blocks, wherein the one or more first parameter sets comprises parameters of thresholds and clipping boundaries that are signalled for the luma component, wherein the one or more second parameter sets comprises parameters of thresholds and clipping boundaries that are signalled for the one or more chroma components, wherein for a given bitstream location from which the parameters are determined, the one or more first parameters sets are signalled separately and independently from the one or more second parameters sets;
• and
• generate a decoded picture based on the de-blocked blocks.

A method of de-blocking filtering of reconstructed picture in a video coding system, the method comprising:

• receiving input data corresponding to a current picture;
• encoding the current picture into a video bitstream comprising coded data for the current picture;
• deriving reconstructed blocks for the current picture;
• determining one or more first parameter sets associated with a de-blocking filter corresponding to a luma component;
• determining one or more second parameter sets associated with a de-blocking filter corresponding to one or more chroma components;
• applying the de-blocking filters to boundaries of the reconstructed blocks using said one or more first and second parameter sets to generate de-blocked blocks as output or reference data for prediction of other picture, wherein the one or more first parameter sets comprises parameters of thresholds and clipping boundaries that are signalled for the luma component, wherein the one or more second parameter sets comprises parameters of thresholds and clipping boundaries that are signalled for the one or more chroma components, wherein for a given bitstream location from which the parameters are determined, the one or more first parameters sets are signalled separately and independently from the one or more second parameter sets;
• and
• signalling said one or more parameters in the video bitstream.