Shaped information coding device for interlaced scanning video and method therefor

A shape information coding method for interlaced scanning video, comprising the steps of:

• (a) comparing a first value obtained by accumulating an error between each pixel of a frame and the pixel adjacent thereto upon the frame of a predetermined size of binary alpha block inputted with a second value obtained by accumulating an error between each pixel of a field and the pixel adjacent thereto upon the field of the binary alpha block to thereby determine a coding mode in accordance with the compared result;
• (b) estimating motion of the predetermined size of binary alpha block inputted by utilizing the determined coding mode as a motion prediction mode, determining a shape information motion prediction mode and a motion vector predictor for shape, based upon the estimated motion information, and performing an operation for the determined motion vector predictor for shape and the estimated motion information to calculate a motion vector difference value for shape;
• (c) determining a type of the binary alpha block in accordance with the motion information in the motion estimating step;
• (d) compensating the motion of the shape information in accordance with the determined shape information motion prediction mode;
• and
• (e) coding the motion-compensated shape information in the determined coding mode.

A shape information coding device for interlaced scanning video, said device comprising:

• a shape information motion estimating means for estimating motion of a predetermined size of binary alpha block inputted, determining a shape information motion prediction mode and a motion vector predictor for shape, based upon the estimated motion information, and performing an operation for the determined motion vector predictor for shape and the estimated motion information to calculate a motion vector difference value for shape;
• a shape information type determining means for determining a type of the binary alpha block in accordance with the motion information in said shape information motion estimating means;
• a shape information coding mode determining means for determining a coding mode of the shape information in accordance with an amount of variation of the motion of the binary alpha block;
• a shape information motion compensating means for compensating the motion of the shape information in accordance with the determined shape information motion prediction mode;
• a field additional information determining means for determining a field block type and additional information on field discrimination in accordance with the coding mode information obtained in said shape information coding mode determining means and the type of binary alpha block obtained in said shape information type determining means and coding the determined additional information;
• and
• a shape information coding means for coding the binary shape information obtained in said shape information motion compensating means in the frame unit or field unit in accordance with the determined coding mode in said shape information coding mode determining means.

A shape information coding device for interlaced scanning video, said device comprising:

• a shape information coding mode determining means for determining a coding mode of shape information in accordance with an amount of variation of motion of a binary alpha block inputted;
• a shape information motion estimating means for estimating motion vector in a frame unit from binary shape information inputted, if the determined coding mode is a frame mode;
• a shape information type determining means for determining a type of the binary alpha block by the motion information obtained from said shape information motion estimating means;
• a shape information motion compensating means for compensating motion of the inputted shape information in accordance with the shape information coding mode obtained in said shape information coding mode determining means;
• a field additional information determining means for determining additional information for field discrimination if the determined coding mode is the field mode;
• a frame coding means for coding the compensated binary shape information in the frame type block unit, if the coding mode information obtained in said shape information coding mode determining means is the frame mode information;
• a field unit motion estimating means for estimating the motion vector from the binary shape information in the field unit, if the coding mode information obtained in said shape information coding mode determining means is the field mode information;
• and
• a field coding means for coding the compensated binary shape information in the field unit in accordance with the motion information obtained in said field unit motion estimating means.