Image representation method and processing device based on local PCA whitening
US10424052B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2015 |
| Grant date | Sep 24, 2019 |
| Priority date | — |
| Expiry date | Oct 12, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/464
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An image representation method and processing device based on local PCA whitening. A first mapping module maps words and characteristics to a high-dimension space. A principal component analysis module conducts principal component analysis in each corresponding word space, to obtain a projection matrix. A VLAD computation module computes a VLAD image representation vector; a second mapping module maps the VLAD image representation vector to the high-dimension space. A projection transformation module conducts projection transformation on the VLAD image representation vector obtained by means of projection. A normalization processing module conducts normalization on characteristics obtained by means of projection transformation, to obtain a final image representation vector. An obtained image representation vector is projected to a high-dimension space first, then projection transformation is conducted on a projection matrix computed in advance and vectors corresponding to words, to obtain a low-dimension vector; and in this way, the vectors corresponding to the words are consistent. The disclosed method and the processing device can obtain better robustness and higher performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.