Motion vector detection apparatus, motion vector detection method, and image capturing apparatus

A motion vector detection method for detecting a motion vector for an entire image, which is used to correct any blur in images to be continuously captured, comprising:

• a motion vector detection step of detecting motion vectors for respective blocks obtained by dividing an image into the respective blocks each having a predetermined size;
• a classifying step of classifying the respective blocks into groups based on the motion vectors detected in the motion vector detection step;
• a representative motion vector calculation step of calculating representative motion vectors which represent the motion vectors of the blocks that belong to the groups classified in the classifying step;
• a first determination step of determining whether each of the groups classified in the classifying step corresponds to a first group or a second group which moves relative to the first group;
• and
• a selection step of selecting, when the number of blocks included in a the second group exceeds a threshold, the representative motion vector corresponding to the second group as the motion vector for the entire image, and selecting, when the number of blocks included in the second group does not exceed the threshold, the representative motion vector corresponding to the first group as the motion vector for the entire image.