Method and apparatus for video intraprediction encoding and decoding

An apparatus for video intraprediction encoding, the apparatus comprising:

• a block division unit which divides an input block into at least two areas;
• an intraprediction unit which performs intraprediction encoding on pixels of a first area of the at least two areas using pixels of a neighboring block and does not perform intraprediction on pixels of the second area, and reconstructs the pixels of the first area;
• an interpolation unit which determines spatial characteristics of pixels of the intraprediction-encoded and reconstructed first area around a pixel of a second area of the at least two areas, determines reference pixels of the intraprediction-encoded and reconstructed first area for prediction of the pixel of the second area based on the spatial characteristics, and predicts the pixel of the second area based on the determined reference pixels of the intraprediction-encoded and reconstructed first area;
• an addition unit which obtains a final intraprediction block by combining the predicted pixels of the first area and the predicted pixels of the second area;
• and
• an encoder which encodes a residual block which indicates a difference between the input block and the final intraprediction block;
• wherein when the intraprediction encoding is performed on the input block, a flag indicating an intraprediction mode which performs intraprediction encoding on pixels of the first area of the at least two areas using pixels of the neighboring block and not performing intraprediction encoding on pixels of the second area is added to a header of a bitstream.

A method of video intraprediction decoding, the method comprising:

• receiving a bitstream including data for a first area of a block that is intraprediction-encoded using pixels of a neighboring block and reconstructed, and data for a second area of the block that is not intraprediction encoded but is predicted using pixel information of the intraprediction-encoded and reconstructed first area, and receiving a flag indicating an intraprediction mode of the block with performs intraprediction encoding on pixels of the first area of the at least two areas using pixels of the neighboring block and not performing intraprediction encoding on pixels of the second area;
• performing intraprediction-decoding on pixels of the first area and determining whether to perform intraprediction-decoding on pixels of the second area based on the flag;
• determining spatial characteristics of pixels of the intraprediction-decoded first area around a pixel of the second area and determining reference pixels of the intraprediction-decoded first area for prediction of the pixel of the second area based on the spatial characteristics;
• predicting the pixel of the second area using the determined reference pixels of the first area;
• obtaining a final intraprediction block by combining the predicted pixels of the first area and the predicted pixels of the second area;
• and
• obtaining a residual block which indicates a difference between the block and the inal intraprediction block from the bitstream.

A method of video intraprediction decoding, the method comprising:

• receiving data for a first area of a block that is intraprediction-encoded using pixels of a neighboring block, and data for a second area of the block that is not intraprediction encoded, and a flag indicating an intraprediction mode of the block which performs intraprediction encoding on pixels of the first area of the at least two areas using pixels of the neighboring block and not performing intraprediction encoding on pixels of the second area;
• performing intraprediction-decoding on pixels of the first area;
• determining spatial characteristics of pixels of the intraprediction-decoded first area around a pixel of a second area of the block and determining reference pixels of the intraprediction-decoded first area for prediction of the pixel of the second area based on the spatial characteristics;
• predicting the pixel of the second area using the determined reference pixels of the intraprediction-decoded first area;
• obtaining a final intraprediction block by combining the predicted pixels of the first area and the predicted pixels of the second area;
• and
• obtaining a residual block which indicates a difference between the block and the inal intraprediction block from the bitstream.

An apparatus for video intraprediction decoding, the apparatus comprising:

• an intraprediction unit which receives a bitstream including data for a first area of a block that is intraprediction-encoded using pixels of a neighboring block and data for a second area of the block that is not intraprediction encoded but is predicted using pixel information of the first area and a flag indicating an intraprediction mode of the block which performs intraprediction encoding on pixels of the first area of the at least two areas using pixels of the neighboring block and not performing intraprediction encoding on pixels of the second area, performs intraprediction-decoding on pixels of the first area and determines whether to perform intraprediction-decoding on pixels of the second area based on the flag;
• an interpolation unit which determines spatial characteristics of pixels of the intraprediction-decoded first area around a pixel of the second area, determines reference pixels of the intraprediction-decoded first area for prediction of the pixel of the second area based on the spatial characteristics, and predicts the pixel of the second area using the determined reference pixels of the first area;
• and
• an addition unit which obtains a final intraprediction block by combining the prediced pixels of the first area and the predicted pixels of the second area.