| 摘要 |
An object of the present invention is to reduce the size of encoded feature descriptors. A feature descriptor encoding apparatus includes a feature point detection unit that detects feature points from an image and outputs coordinate values; a local feature descriptor extracting unit that extracts local feature descriptors from local regions centered on the coordinate values of the feature points; a coordinate value scanning unit that converts the coordinate values into index values according to a specific scanning method; a sorting unit that sorts the index values; a difference calculation unit that calculates a differential value between two adjacent index values of the sorted index values and outputs a sequence of differential values; a differential encoding unit that encodes the sequence of the differential values in a sequential permutation; and a local feature descriptor encoding unit that encodes the local feature descriptors of the corresponding feature points in the same permutation as that of the sorted index values. |
