Method and apparatus for detecting motion vector, and method and apparatus for processing image signal

A motion vector detecting apparatus comprising:

• a pulldown detecting unit which detects whether a 3D image signal in which a left-eye image signal and a right-eye image signal are compressed and disposed within one frame is a pulldown-converted image signal;
• an LR separating unit which outputs an LR separation signal separated into the left-eye image signal and the right-eye image signal in each of frames having the same image content by sequentially separating the left-eye image signal and the right-eye image signal for each frame in any order within a repetition period in which frames having the same image content are repeated, when the pulldown detecting unit detects that the 3D image signal is a pulldown-converted image signal;
• a frame delay LR separating unit which outputs a frame delay LR separation signal separated into a left-eye image signal and a right-eye image signal in a frame before one repetition period by allowing the left-eye image signal and the right-eye image signal of the LR separation signal to correspond to each other, when the pulldown detecting unit detects that the 3D image signal is a pulldown-converted image signal;
• a motion vector detecting unit which detects a first motion vector of the left-eye image signal through the left-eye image signal of the LR separation signal and the left-eye image signal of the frame delay LR separation signal and a second motion vector of the right-eye image signal through the right-eye image signal of the LR separation signal and the right-eye image signal of the frame delay LR separation signal;
• and
• an LR combination unit which delays any one of the first motion vector and the second motion vector to coincide the timings of both frames and combines the first motion vector and the second motion vector in units of frames to output the combined first motion vector and second motion vector as a motion vector.