Lg Electronics Inc.

Min Cheol Hong

In one embodiment, the method includes obtaining quantization information related to at least one of a first block and an adjacent second block, comparing the quantization information with a predefined constant value, and performing a filtering process based on a result from the comparing step. The filtering process includes calculating a value of at least one pixel in the first block based on pixel values of at least two pixels in the first block, and calculating a value of at least one pixel in the second block based on pixel values of at least two pixels in the second block.

Method of removing a blocking artifact using quantization information in a filtering system

In one embodiment, the method includes obtaining quantization information related to at least one of a first block and an adjacent second block, comparing the quantization information with a predefined constant value, obtaining block type information for the first and second block, and performing a filtering process based on a result from the comparing step when both of the first block and the second block are intra-coded blocks according to the block type information.

In one embodiment, the method includes obtaining quantization information related to at least one of a first block and a second block. The second block is adjacent to the first block. The quantization information is compared with a predefined constant value, and block type information for the first and second block is obtained. The block type information indicates whether a block is an intra-coded block. A filtering process is performed based on the comparing step when both of the first block and the second block are intra-coded blocks according to the block type information. The filtering process includes calculating a value of at least one pixel in the first block based on pixel values of at least two pixels in the first block, and calculating a value of at least one pixel in the second block based on pixel values of at least two pixels in the second block.

In one embodiment, the method includes obtaining quantization information related to at least one of a first block and an adjacent second block, comparing the quantization information with a predefined constant value, and performing a filtering process based on the comparing step when both of the first block and the second block are intra-coded blocks according to obtained block type information. The filtering process includes calculating a value of at least one pixel in the first block based on pixel values of at least two pixels in the first block, and calculating a value of at least one pixel in the second block based on pixel values of at least two pixels in the second block. The at least two pixels in the first block and the at least two pixels in the second block are successive pixels across a block boundary between the first block and the second block.

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.

Method of removing a blocking phenomenon using properties of two blocks

In one embodiment, the method includes obtaining quantization information related to at least one of a first block and an adjacent second block, comparing the quantization information with a predefined constant value, and performing a filtering process based on the comparing step when both of the first block and the second block are intra-coded blocks according to obtained block type information. The filtering process includes calculating a value of at least one pixel in the first block to obtain a filtered value based on pixel values of at least two pixels in the first block. At least two successive pixels on a block boundary between the first and second blocks are filtered.

In one embodiment, the method includes obtaining quantization information related to at least one of a first block and an adjacent second block, comparing the quantization information with a predefined constant value, and performing a filtering process based on a result from the comparing step. The filtering process includes calculating a value of at least one pixel in the first block based on pixel values of at least two pixels in the first block, and calculating a value of at least one pixel in the second block based on pixel values of at least two pixels in the second block. The at least two pixels in the first block and the at least two pixels in the second block are successive pixels across a block boundary between the first block and the second block.

In one embodiment, the method includes obtaining quantization information related to at least one of a first block and an adjacent second block, comparing the quantization information with a predefined constant value, and performing a filtering process based on a result from the comparing step. The filtering process includes calculating a value of at least one pixel in the first block to obtain a filtered value based on pixel values of at least two pixels in the first block. The method further includes filtering at least two successive pixels on a block boundary between the first and second blocks.

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.

Apparatus for filtering a pixel using a filtering coefficient

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.

Apparatus for filtering a pixel using horizontal and vertical filtering coefficients

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.

Apparatus for performing loop-filtering on four successive pixels of an image

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.

Method of filtering a pixel of an image using a weighted filtering coefficient

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.

Method of obtaining a filtered value by application of a shift operation

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.

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Seoul, South Korea

Min Cheol Hong