Improvement of Sentinel-1 Remote Sensing Data Classification by DWT and PCA

Figure 6

One level of DWT decomposition of an image. LH image corresponds to the lines low-pass and then the columns high-pass-filtered version of the image; HL image corresponds to the lines high-pass and then the columns low-pass-filtered version of the image. HH image corresponds to the lines high-pass and then the columns high-pass-filtered version of the image.