PCA compression

Step 1.

Select a compression method: Edit → Compress → PCA compression

Step 2.

Select the desired percent variance from a dialogue window. Higher number of variance will give more bands and low compression ratio. Significant level of information might be preserved. Lower number will have very few principal components.

Step 3.

Select a folder to save the compressed datafile. The file name will be generated automatically as compressed datacube_95%.mat, where the number indicated selected percent variance.  

After completion, IDCube calculates the compression ratio by comparing the size of the original data and the size of the compressed data. This information, along with the number of independent components and the size of the saved file, is then displayed to the user.

The message box indicates that the new compressed datacube file can be opened in a usual way.