Motion vector correction device and method and video signal processing apparatus and method

A motion vector correction device comprising:

• a circuitry that
• detects, using pixel data in at least two real frames in an input video signal, a first motion vector necessary for generating interpolated pixel data forming an interpolated frame to be inserted between the two real frames, and
• corrects the first motion vector to decrease the magnitude of first motion vector when the magnitude of first motion vector exceeds a first threshold,
• wherein
• when the magnitude of first motion vector exceeds the first threshold, the circuitry decreases the magnitude of first motion vector within a range where the magnitude of first motion vector is larger than the first threshold such that a decrement amount of the magnitude of first motion vector increases as a value between the magnitude of first motion vector and the first threshold increases, and outputs the result as a second motion vector,
• when the magnitude of second motion vector exceeds a second threshold, the circuitry keeps the magnitude of second motion vector unchanged from the second threshold to a third threshold larger than the second threshold, and outputs the result as a third motion vector, and
• when the magnitude of second motion vector exceeds the third threshold, the circuitry decreases the magnitude of second motion vector within a range where the magnitude of second motion vector is smaller than the second threshold such that a decrement amount of the magnitude of second motion vector increases as a value between the magnitude of second motion vector and the third threshold increases, and outputs the result as a third motion vector, and
• wherein the circuitry calculates the second motion vector according to the following calculus equation
• the magnitude of first motion vector)×m/n+the first threshold)×(n−m)/n,
• where variables m and n are natural numbers which have a relation of m<n.

A motion vector correction method comprising:

• a motion vector detection step for, using pixel data in at least two real frames in an input video signal, detecting a first motion vector necessary for generating interpolated pixel data forming an interpolated frame to be inserted between the two real frames;
• and
• a motion vector correction step for correcting the first motion vector to decrease the magnitude of first motion vector when the magnitude of first motion vector exceeds a first threshold,
• wherein the motion vector correction step includes:
• a motion vector value suppressing step for decreasing, when the magnitude of first motion vector exceeds the first threshold, the magnitude of first motion vector within a range where the magnitude of first motion vector is larger than the first threshold such that a decrement amount of the magnitude of first motion vector increases as a value between the magnitude of first motion vector and the first threshold increases, and outputting the result as a second motion vector;
• and
• a motion vector value converting step for
• keeping, when the magnitude of second motion vector exceeds a second threshold, the magnitude of second motion vector unchanged from the second threshold to a third threshold larger than the second threshold, and outputting the result as a third motion vector, and
• decreasing, when the magnitude of second motion vector exceeds the third threshold, the magnitude of second motion vector within a range where the magnitude of second motion vector is smaller than the second threshold such that a decrement amount of the magnitude of second motion vector increases as a value between the magnitude of second motion vector and the third threshold increases, and outputting the result as a third motion vector.