Patent ID: 8238448

Claim:
An apparatus for removing a blocking phenomenon in a first block using properties of a second block adjacent to the first block, comprising: a decoder configured to determine whether the second block has non-zero transform coefficient information, the decoder further configured to, determine whether the second block corresponds to an intra coded block, determine a filter strength value in consideration of at least one among a presence of the non-zero transform coefficient information and the correspondence of the second block to the intra coded block, obtain a pixel value difference between at least two pixels on a block boundary between the first block and the second block, determine coefficients, for pixels on the block boundary between the first and second blocks, based on the filter strength value, and calculate values of the pixels on the block boundary based on the determined coefficients and the obtained pixel value difference, the calculating including performing a bit shift operation, and the calculating step further including, calculating values of at least two successive pixels in the first block based on pixel values of the at least two successive pixels in the first block, and calculating values of at least two successive pixels in the second block based on pixel values of the at least two successive pixels in the second block, wherein the bit shift operation uses an integer wherein the integer is greater than 1 and wherein the bit shift operation is performed after using the obtained pixel value difference.