A video encoding method includes obtaining a current frame of a video input; dividing the obtained current frame into a plurality of blocks; obtaining a residual block for each of the plurality of blocks; performing scan region based coefficient coding (SRCC) to the residual block, wherein a size of a scan region of a current block is predicted based on the sizes of the scan regions of previously coded blocks, such that coding efficiency and compression performance are improved; and coding the current frame to generate a bitstream including the coded residual block for each of the plurality of blocks of the current frame.