发明名称 |
FEATURE DESCRIPTOR ENCODING APPARATUS, FEATURE DESCRIPTOR ENCODING METHOD, AND PROGRAM |
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. |
申请公布号 |
US2014321765(A1) |
申请公布日期 |
2014.10.30 |
申请号 |
US201214359229 |
申请日期 |
2012.11.15 |
申请人 |
NEC CORPORATION |
发明人 |
Iwamoto Kota;Mase Ryota |
分类号 |
G06F17/30;G06K9/46;G06T9/00 |
主分类号 |
G06F17/30 |
代理机构 |
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代理人 |
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主权项 |
1. A feature descriptor encoding apparatus comprising:
a feature point detection unit configured to detect feature points from an image and outputs coordinate values; a local feature descriptor extracting unit configured to extract local feature descriptors from local regions centered on the coordinate values of the feature points; a coordinate value scanning unit configured to convert the coordinate values into index values according to a specific scanning method; a sorting unit configured to sort the index values; a difference calculation unit configured to calculate a differential value between two adjacent index values of the sorted index values and output a sequence of differential values; a differential encoding unit configured to encode the sequence of the differential values in a sequential permutation; and a local feature descriptor encoding unit configured to encode the local feature descriptors of the corresponding feature points in the same permutation as that of the sorted index values. |
地址 |
Tokyo JP |