In an imaging apparatus, a JPEG coding unit makes JPEG data by respectively compressing plural images obtained from an imaging device. A code retention unit retains each JPEG data. A thumbnail data creation unit creates a thumbnail from each of the images. A thumbnail retention unit retains the thumbnail. A feature point detection unit detects a feature point from the thumbnail. A partial image decode unit respectively decodes zones including the feature points from each JPEG data. A displacement amount calculation unit obtains positional information of feature points in the decoded individual zones and calculates a displacement amount of each JPEG data based on the positional information.