Patent ID: 8243799

Claim:
A method of removing a blocking phenomenon using properties of two blocks in a loop filtering system, comprising: determining whether at least one of a first block and a second block has non-zero transform coefficient information, and the second block being adjacent to the first block, determining a filter strength value in consideration of a presence of the non-zero transform coefficient information, determining coefficients, for pixels on a block boundary between the first and second blocks, based on the filter strength value, and calculating values of the pixels on the block boundary based on the determined coefficients, the calculating including performing a bit shift operation, 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 one.