In this letter, we conduct a comparative study and investigate the relationship between two well-known techniques in hyperspectral image detection and classification: orthogonal subspace projection (OSP) and constrained energy minimization (CEM). It is shown that they are closely related and essentially equivalent provided that the noise is white with large SNR. Based on this relationship, the performance of OSP can be improved via data-whitening and noise-whitening processes.
|Number of pages||5|
|Journal||IEEE Transactions on Geoscience and Remote Sensing|
|Issue number||6 PART II|
|State||Published - Jun 2003|
- Constrained energy minimization (CEM)
- Hyperspectral imagery
- Orthogonal subspace projection (OSP)