**4. Results and discussions**

Satellite Images chosen for testing the algorithm described in Section III are shown in **Figure 3(a)-(c)**. The dimensions of the selected images are 512 x 512.

**Figure 3.** *Three high Resolution Satellite Images.*

*Compression of High-Resolution Satellite Images Using Optical Image Processing DOI: http://dx.doi.org/10.5772/intechopen.94147*

**Figure 4.** *Three extracted images.*


#### **Table 1.**

*Summary of PSNR calculation.*

During zonal filtering operation, images 1(, ), 2(, ) and 3 (, ) have been extracted by Regional Inverse Fourier Transform taking upper spectrum from horizontal direction. Extracted images are shown in **Figure 4(a)-(c)**, respectively. A summary of the PSNR calculation is presented in **Table 1**.
