Video decoding device and image display device

A decoding device receiving an input video stream having a first macro block group including a plurality of macro blocks for forming a first image, and a second macro block group including a plurality of macro blocks for forming a second image, formed on the same frame,

• the decoding device comprising:
• a macro block selector circuit for selecting, as objects to be decoded, macro blocks of one of the macro block groups;
• a decoding circuit for decoding only the selected macro blocks;
• and
• a motion vector shift circuit for supplying a motion vector of a selected macro block to the decoding circuit,
• wherein the motion vector shift circuit is further configured to correct a reference indicated by the motion vector of the selected macro block when the motion vector refers to a macro block outside of the one macro block group.

A method of decoding an input video stream having a first macro block group including a plurality of macro blocks for forming a first image, and a second macro block group including a plurality of macro blocks for forming a second image, formed on the same frame, comprising:

• selecting, as objects to be decoded, macro blocks of one of the first and second macro block groups;
• decoding only the selected macro blocks at a decoding circuit;
• and
• supplying a motion vector of a selected macro block to the decoding circuit,
• wherein a reference indicated by the motion vector of the selected macro block is corrected before the motion vector is supplied to the decoding circuit when the motion vector refers to a macro block outside of the one macro block group.

A method of decoding an input 3-dimensional video stream having a right-eye macro block group including a plurality of macro blocks for forming a right-eye image, and a left-eye macro block group including a plurality of macro blocks for forming a left-eye image, the method comprising:

• selecting macro blocks belonging to a single macro block group, the single micro-block group being the left-eye macro block group or the right-eye macro block group, as objects to be decoded;
• supplying the selected macro blocks to a decoding circuit for decoding;
• determining a first motion vector for one of the selected macro blocks;
• and
• supplying a second motion vector to the decoding circuit based on the first motion vector,
• wherein, when the first motion vector refers to a macro block belonging to the single macro block group, the second motion vector is supplied to the decoding circuit without shifting the first motion vector, and
• wherein, when the first motion vector refers to a macro block belonging to the other macro block group, the second motion vector is supplied to the decoding circuit by first shifting the first motion vector.