Moving picture decoding device, moving picture decoding method, moving picture decoding system, integrated circuit, and program

A moving picture decoding device which performs motion compensation, said device comprising:

• a decoding unit configured to decode (i) a motion vector indicating a sub-pixel position and (ii) a filter coefficient for identifying a pixel value at the sub-pixel position, the motion vector and the filter coefficient being included in a coded stream;
• an error detecting unit configured to detect an error in the filter coefficient;
• a modifying unit configured to modify the motion vector so as to enable identification of a pixel value at a pixel position for use in motion compensation, when the error is detected;
• and
• a motion compensation unit configured to perform motion compensation by identifying the pixel value at the pixel position using the modified motion vector, when the error is detected.

An integrated circuit which performs motion compensation, said circuit comprising:

• a decoding unit configured to decode (i) a motion vector indicating a sub-pixel position and (ii) a filter coefficient for identifying a pixel value at the sub-pixel position, the motion vector and the filter coefficient being included in a coded stream;
• an error detecting unit configured to detect an error in the filter coefficient;
• a modifying unit configured to modify the motion vector so as to enable identification of a pixel value at a pixel position for use in motion compensation, when the error is detected;
• and
• a motion compensation unit configured to perform motion compensation by identifying the pixel value at the pixel position using the modified motion vector, when the error is detected.

A moving picture decoding method of performing motion compensation, said method comprising:

• decoding (i) a motion vector indicating a sub-pixel position and (ii) a filter coefficient for identifying a pixel value at the sub-pixel position, the motion vector and the filter coefficient being included in a coded stream;
• detecting an error in the filter coefficient;
• modifying the motion vector so as to enable identification of a pixel value at a pixel position for use in motion compensation, when the error is detected;
• and
• performing motion compensation by identifying the pixel value at the pixel position using the modified motion vector, when the error is detected.

A moving picture decoding system which performs motion compensation, said system comprising:

• an integrated circuit which performs motion compensation;
• and
• a memory for storing a reference picture,
• wherein said integrated circuit including:
• a decoding unit configured to decode (i) a motion vector indicating a sub-pixel position and (ii) a filter coefficient for identifying a pixel value at the sub-pixel position, the motion vector and the filter coefficient being included in a coded stream;
• an error detecting unit configured to detect an error in the filter coefficient;
• a modifying unit configured to modify the motion vector so as to enable identification of a pixel value at a pixel position for use in motion compensation, when the error is detected;
• and
• a motion compensation unit configured to perform motion compensation by identifying the pixel value at the pixel position using the modified motion vector, when the error is detected.

A non-transitory computer-readable recording medium having a program recorded thereon, the program causing a computer to execute a moving picture decoding method of performing motion compensation, the method comprising:

• decoding (i) a motion vector indicating a sub-pixel position and (ii) a filter coefficient for identifying a pixel value at the sub-pixel position, the motion vector and the filter coefficient being included in a coded stream;
• detecting an error in the filter coefficient;
• modifying the motion vector so as to enable identification of a pixel value at a pixel position for use in motion compensation, when the error is detected;
• and
• performing motion compensation by identifying the pixel value at the pixel position using the modified motion vector, when the error is detected.