Abstract: In one embodiment, the method includes obtaining a coded block pattern of first and second blocks. The coded block pattern may be one of a plurality of coded block patterns, the plurality of coded block patterns may include an intra-coded block, and the second block may be adjacent to the first block. Whether the first block and the second block have non-zero transform coefficient information is determined if the block type of the first block and the second block is not intra-coded block. A non-zero filter strength value is determined based on the obtained coded block pattern of the first and second block and the determination of whether the first block and second blocks have non-zero transform coefficient information, and the blocking phenomenon is removed according to the filter strength value.

Abstract: 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 four successive pixels by using at least three successive pixels if the quantization information is greater than the threshold value and the type of the first block is an intra-coded block type. Two pixels of the four successive pixels are in the first block and two pixels of the four successive pixels are in a second block adjacent to the first block.

Abstract: In one embodiment, the method includes determining a reference pixel group including a pixel to be filtered. The reference pixel group includes at least three successive pixels. The method further includes applying weight factors to at least each of the three successive reference pixels. The weight factors are different according to pixel position. A filtered value is obtained by summing at least the three weighted successive pixels and applying a shift operation to the sum for dividing the sum.

Abstract: In one embodiment, the method includes obtaining a coded block pattern of first and second blocks. The coded block pattern is one of a plurality of coded block patterns, the plurality of coded block patterns include an intra-coded block, and the second block is adjacent to the first block. The method further includes obtaining a motion vector difference between a motion vector for the first block and a motion vector for the second block, and determining a non-zero filter strength value based on the obtained coded block pattern of the first and second block as first priority and the obtained motion vector difference as second priority. The blocking phenomenon is removed according to the filter strength value.

Abstract: In one embodiment, the method includes obtaining a block type of the second block and the third block. The second block is adjacent to the first block horizontally, and the third block is adjacent to the first block vertically. The method further includes determining whether the second and third blocks have non-zero transform coefficient information if the block type of the second and third block, respectively, are not an intra-coded blocks. First and second motion vector differences between a motion vector for the first block and motion vectors for the second and third blocks, respectively, are obtained. A horizontal filter strength value and a vertical filter strength value are determined based on the above steps, and the blocking phenomenon in the first block is removed according to the horizontal filter strength value and the vertical filter strength value.

Abstract: In one embodiment, four horizontal successive pixels are first filtered by a decoder in a digital video appliance based on a determined horizontal filtering coefficient. Two pixels of the four horizontal successive pixels are in a first block and two pixels of the four horizontal successive pixels are in a second block. Then four vertical successive pixels are filtered by the decoder based on a determined vertical filtering coefficient. Two pixels of the four vertical successive pixels are in the first block and two pixels of the four vertical successive pixels are in a third block.

Abstract: In one embodiment, the method includes obtaining a pixel value difference between two successive pixels. The two successive pixels are on a block boundary. The method further includes calculating the filtering coefficient based on the pixel value difference, weighting the filtering coefficient, and obtaining a filtered pixel value based on the weighted filtering coefficient.

Abstract: In one embodiment, the apparatus includes a decoder configured to obtain a pixel value difference between two successive pixels. The two successive pixels are on a block boundary. The decoder is configured to calculate the filtering coefficient based on the pixel value difference, and obtain four successive filtered pixel values based on the filtering coefficient. The four successive pixels include the two successive pixels used in the obtaining a pixel value difference, and two of the four successive pixels are included in a first block and two of the four successive pixels are included in a second block.

Abstract: In one embodiment, the method includes obtaining at least three horizontally successive reference pixel values including a pixel to be filtered, and applying first weight factors to at least each of the three horizontally successive reference pixel values. The first weight factors are different according to pixel position. A first filtered value is obtained by summing at least the three weighted horizontally successive pixel values. The method further includes obtaining at least three vertically successive reference pixel values including a pixel to be filtered, and applying second weight factors to at least each of the three vertically successive reference pixel values. The second weight factors are different according to pixel position. A second filtered value is obtained by summing at least the three weighted vertically successive pixel values.

Abstract: In one embodiment, the method includes obtaining quantization information of a first block, obtaining a block type of the first block, and comparing the quantization information and a threshold value. Loop-filtering is performed on 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 on 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.

Abstract: In one embodiment, the method includes obtaining quantization information of a first block, obtaining a block type of the first block, and comparing the quantization information and a threshold value. Loop-filtering is performed on four successive pixels by using at least three successive pixels if the quantization information is greater than the threshold value and the type of the first block is an intra-coded block type. Two pixels of the four successive pixels are in the first block and two pixels of the four successive pixels are in a second block adjacent to the first block.

Abstract: In one embodiment, the apparatus includes a decoder. The decoder is configured to obtain at least three horizontally successive reference pixel values including a pixel to be filtered, and apply first weight factors to at least each of the three horizontally successive reference pixel values. The first weight factors are different according to pixel position. A first filtered value is obtained by the decoder by summing at least the three weighted horizontally successive pixel values. The decoder is also configured to obtain at least three vertically successive reference pixel values including a pixel to be filtered, and apply second weight factors to at least each of the three vertically successive reference pixel values. The second weight factors are different according to pixel position. A second filtered value is obtained by the decoder by summing at least the three weighted vertically successive pixel values.

Abstract: In one embodiment, the apparatus includes a decoder configured to obtain quantization information of a first block, and determine a filtering coefficient based on values obtained by using the quantization information. A filtered pixel value included in a second block is obtained by the decoder based on the filtering coefficient. The second block is adjacent to the first block.

Abstract: In one embodiment, four horizontal successive pixels are first filtered based on a determined horizontal filtering coefficient. Two pixels of the four horizontal successive pixels are in a first block and two pixels of the four horizontal successive pixels are in a second block. Then four vertical successive pixels are filtered based on a determined vertical filtering coefficient. Two pixels of the four vertical successive pixels are in the first block and two pixels of the four vertical successive pixels are in a third block.

Abstract: In one embodiment, the method includes obtaining quantization information of a first block including the pixel to be filtered, and obtaining a block type of the first block and a second block. The second block is adjacent to the first block. The quantization information is compared to a threshold value, and loop-filtering is performed on the pixel to be filtered by using at least three successive pixels if the quantization information is greater than the threshold value and the type of the first and second block is an intra-coded block type. The at least three successive pixels include the pixel to be filtered.

Abstract: In one embodiment, the method includes obtaining a block type of the second block, and determining whether the second block has non-zero transform coefficient information if the obtained block type of the second block is not an intra-coded block. The method further includes determining a non-zero filter strength value based on the obtained coded block pattern the second block and the determination of whether the second block has non-zero transform coefficient information, and removing the blocking phenomenon in the first block according to the filter strength value.

Abstract: In one embodiment, loop-filtering is performed by a decoder on four successive pixels if obtained quantization information for a first block is greater than the threshold value and the type of the first block and a second block is intra-coded block type. Two pixels of the four successive pixels are in the first block and two pixels of the four successive pixels are in the second block, which is adjacent the first block. The decoder is also configured to perform additional filtering on two successive pixels on the block boundary based on a comparison result of the quantization information and a second threshold value.

Abstract: In one embodiment, the method includes obtaining quantization information of a first block. The first block includes a pixel to be filtered. The method further includes determining a filtering coefficient based on a value obtained from a table using the quantization information, and obtaining four successive filtered pixel values based on the filtering coefficient. Two of the four successive filtered pixels are included in the first block and two of the four successive filtered pixels are included in a second block adjacent the first block.

Abstract: In one embodiment, the apparatus includes a decoder configured to obtain a coded block pattern of first and second blocks. The coded block pattern may be one of a plurality of coded block patterns, the plurality of coded block patterns may include an intra-coded block, and the second block may be adjacent to the first block. The decoder is configured to determine whether the first block and the second block have non-zero transform coefficient information if the block type of the first block and the second block is not intra-coded block. A non-zero filter strength value is determined by the decoder based on the obtained coded block pattern of the first and second block and the determination of whether the first block and second blocks have non-zero transform coefficient information, and the blocking phenomenon is removed by the decoder according to the filter strength value.

Abstract: The present invention relates to a method for eliminating a blocking effect in a compressed video signal signal. The method of the invention includes: the encoding step of eliminating a blocking effect by compensating the motion of a signal compressed in block unit to be transmitted; the decoding step of restoring the motion compensated video signal to the original video signal by reducing the prediction residual between the motion compensated video signal and the original video signal and the blocking effect; and the post-filtering step of performing post-filtering in a blocking elimination filter in order to eliminate a blocking effect and ring effect remained in the compensated signal. The equation for obtaining the original pixel is made simple by eliminating the remaining blocking effect and ring effect using a loop/post filter.