Techniques are described that can be used to identify blocking artifacts in both vertical and horizontal directions. For blocking artifacts in a vertical direction, a horizontal gradient is determined for a pixel. Gradient smoothing is performed for pixels in the row of the pixel. A ratio of the horizontal gradient over the gradient smoothing is determined. Any pixel with a ratio above a threshold and in a segment with a length that exceeds a threshold length as potentially having block artifacts. Each column with pixels that potentially have block artifacts is inspected to determine whether a number of block artifacts in the column are a local maximum and whether there is a sufficient number of blocking artifacts in the column. Columns that satisfy both conditions are considered to include blocking artifacts. To determine blocking artifacts in the horizontal direction, a similar technique is used as described with regard to vertical direction except row and columns are reversed.
申请公布号
WO2012024089(A3)
申请公布日期
2012.04.26
申请号
WO2011US46496
申请日期
2011.08.03
申请人
INTEL CORPORATION;AHUJA, NILESH, A.;CAVIEDES, JORGE, E.