Video signal coding apparatus considering edge characteristic and method for determining quantization level

摘要

The present invention is characterized in that when an edge exists in a macroblock, the edge characteristic is obtained by dividing the macroblock into 16 subblocks to reduce the quantization level of the macroblock having edges to eliminate the flashing phenomenon on the screen due to the quantization error The present invention relates to a video signal encoding apparatus and a quantization level determination method. When calculating a quantization level value for adjusting a quantization unit in the forward direction analyzing unit, the macroblock is divided into 16 subblocks constituted by 4x4 pixels, and a minimum variation value during the activity of the subblock is divided into Activity road is decided. Here, the normalized activity is calculated using the average activity of the frame before the activation block coding of the obtained macroblock, and the quantization level value is calculated by the normalized activity. Then, the quantization level value of the macroblock in which the edge exists is lowered, and the flashing occurring on the screen can be eliminated.