Method of removing blocking artifacts in a coding system of a moving picture

A method for removing blocking artifacts in a coding system comprising:

• determining at least pixel sets S0, S1, S2 around a block boundary;
• selecting one of a default mode and a DC offset mode as a deblocking mode based on an amount of blocking artifacts;
• deblocking filtering of pixels adjacent the block boundary if the default mode is selected;
• and
• removing artifacts in the DC offset mode, if the DC offset mode is selected and a DC offset mode condition is satisfied, wherein the artifacts are removed in the DC offset mode according to the following equation:
• v
• n
• =
• ∑
• 4
• k
• =
• -
• 4
• ⁢
• b
• k
• ·
• p
• n
• +
• k
• ,
• 1
• ≤
• n
• ≤
• 8
• Pm=(|v1−v0|<QP)?v0:v1,
• if m<1;
• vm, if 1≦m≦8;
• (|v8−v9|<QP) v9:v8, if m>8;
• {bk:−4≦k≦4}={1,1,2,2,4,2,2,1,1}//16,
• wherein v0−v9 are boundary pixels, QP is the quanatation parameter of a block adjacent the block boundary, and vn is an adjusted pixel value.

A method for removing blocking artifacts in a coding system comprising:

• determining at least pixel sets S0, S1, S2 around a block boundary;
• selecting one of a default mode and a DC offset mode as a deblocking mode based on an amount of blocking artifacts;
• deblocking filtering of pixels adjacent the block boundary based on a simple inner product of a DCT kernel and pixels adjacent to the block boundary, if the default mode is selected;
• and
• removing artifacts in the DC offset mode, if the DC offset mode is selected and a DC offset mode condition is satisfied, wherein the artifacts are removed in the DC offset mode according to the following equation:
• v
• n
• =
• ∑
• 4
• k
• =
• -
• 4
• ⁢
• b
• k
• ·
• p
• n
• +
• k
• ,
• 1
• ≤
• n
• ≤
• 8
• Pm=(|v1−v0|<QP)?v0:v1,
• if m<1;
• vm, if 1≦m≦8;
• (|v8−v9|<QP)?v9:v8, if m>8;
• {bk;
• −4≦k≦4}={1,1,2,2,4,2,2,1,1}//16
• wherein v0−v9 are boundary pixels, QP is the quantization parameter of a block adjacent the block boundary, and vn is an adjusted pixel value,
• wherein bk and pn+k are variables used to calculate the adjusted pixel value vn where n is an integer among 1, 2, 3, 4, 5, 6, 7, and 8,
• wherein bk changes according to a value of k where k is one of −4, −3, −2, −1, 0, 1, 2, 3, 4,
• wherein pn+k is decided according to pm where m=n+k and m is an integer,
• wherein Pm is one of boundary pixels values v0 to v9 according to given conditions of (|v1−v0|<QP) and (|v8−v9|<QP) and a value of m.