Patent ID: 6307976
Filing Date: 2001-10-23
Classification: H04N

Abstract:
An apparatus for adaptively coding shape information by using characteristics of the shape information in case of interlaced video, including a coding apparatus for the interlaced video comprising:binary alpha block (BAB) division means for dividing the binary shape information into BABs of a predetermined size;coding type mode determining means for determining whether to code said BAB received from said BAB division means from a frame or from a field;switching means for switching said BAB received from said BAB division means according to a coding type mode signal produced by said coding type mode determining means;motion estimation means for estimating a motion from said BAB received from said BAB division means and a previous shape information frame;motion compensation means for compensating said current BAB for the motion using motion information received from said motion estimation means and the previous shape BAB;frame type coding means for receiving said BAB via said switching means and a motion compensated BAB from said motion compensation means and coding the BAB using the motion compensated BAB in unit of frame type;field type coding means for receiving said BAB via said switching means and the motion compensated BAB from said motion compensation means and coding the BAB using the motion compensated BAB in unit of field type;shape reconstructing means for reconstructing the shape information from the BAB received from said frame type coding means and the field type coding means;previous shape memory means for storing the reconstructed shape information received from said shape reconstructing means;overhead coding means for creating overhead information from the motion information received from said motion estimation means and the data received from said frame type coding means and said field type coding means; andmultiplexing means for multiplexing the coded data received from said frame type coding means and said field type coding means and said overhead information received from said overhead coding means before transmission.