In one embodiment, the apparatus includes a decoder configured to obtain quantization information of a first block, obtain a block type of the first block, and compare the quantization information and a threshold value. Loop-filtering is performed by the decoder on a first set of four successive pixels by using at least three successive pixels in a horizontal direction firstly if the quantization information is greater than the threshold value and the type of the first block is intra-coded block type, and loop-filtering is performed by the decoder on a second set of four successive pixels by using at least three successive pixels in a vertical direction secondly if the quantization information is greater than the threshold value and the type of the first block is intra-coded block type.