Читать книгу Change Detection and Image Time-Series Analysis 1 - Группа авторов - Страница 20

By increasing the size of the SE, change objects can be modeled at different scales, while exploring the interaction with the surrounding regions to preserve more geometrical details. Accordingly, a more comprehensive description of change objects is obtained through multiscale analysis. Therefore, a multiscale ensemble is conducted on the reconstructed SCVs. Let be the stacking of the reconstructed SCVs (i.e. at a given size i, having a dimensionality of 2×B. It is defined as:

[1.12]

Then, the extended SCV is defined as an integration of sequential with lower and upper bounds equal to u and v, respectively:

[1.13]

Consequently, an extended SCV feature set with 2×B×M dimensionality is built, where M is the length of components in the sequence, i.e. M = v − u + 1. It is worth noting that S[u, v] extends the change representation along the spectral direction, as well as considering the multiscale spatial information in the ensemble process. Then, S[u, v] is used as the input for the detector.

Figure 1.4. Block scheme of the proposed superpixel-level multiclass CD approach