Perhaps you should try some spelling variations:
the preprocessing » the processing (Expand search), their processing (Expand search), image preprocessing (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease pro (Expand search)
decrease of » decrease in (Expand search)
of decrease » or decrease (Expand search), not decrease (Expand search), of decree (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( decrease _ decrease the preprocessing ) OR ( decrease to decrease of decrease ))~.