A novel research of bit-plane coding scheme of FGS

In the paper, the authors propose a novel bit-plane coding scheme of the DCT coefficients´ residues which divides an 8×8 block of the DCT coefficients´ residues into a positive coefficient block and a negative coefficient block, and subsequently encodes the two coefficient blocks with bit-plane coding. The number of (RUN, EOP) symbols in each bit-plane remains the same in the proposed and original schemes. As the number of non-zero coefficients does not change in the two schemes, to differentiate the positive and negative bit-plane coefficients, only one flag bit must be inserted between the positive bit-plane and the negative bit-plane. Therefore, at most six flag bits are used in a block. As a result, the total coding bits using the signs of all DCT coefficients´ residues are decreased, thus improving coding efficiency.