Question 2: Image Filteriing by PCI focus

By using PCI focus, we are also able to operate filtering function. The reason why I tried to make filtered image with this operation is that I wanted to see what filtering function can eliminate dots in band 3. Using this way is useful because it has the "Apply to image" function to see the filtering result immediately.  

 

Through Moduler, it was time-consuming to try all filtering operations to erase one specific noise. I tried Gaussian Filter and Average (Mean) Filter to eliminate dots all over the image, however, both filtering operation was not able to eliminate all dots on Band 3. However, with Mode in Low Pass Filtering in PCI Focus, I was able to see that this filtering system can  clearly eliminate dots in Band 3.