Implementing the frequency filtering into a dictionary image

In our previous research we have proposed new method for image compression which was based on LZ77 dictionary algorithm. We introduced two modifications such as inaccurate color matching and noise acceptance. Experimental results presented in that paper proved that the new method of image compression gives promising results as compared with original LZ77 dictionary algorithm. In this paper, we propose to supplement the previous algorithm with frequency content reduction. To this end we propose an interpolation based scaling and a compression along the vertical axes. The obtained results are compared to the previously proposed method.