Fig. 1. Ideal circular shaped image filter in 2D domain
Fig. 2. Example of using an ideal circular filter
Fig. 3. Hexagon-shaped filter for multiple frequency selection
Fig. 4. The proposed N-polygon shaped ideal filter for 2D image. N = 6 in this work.
Fig. 5. Sample results of filtered image (high-pass filter) using both circle and polygon shaped filters
Fig. 6. Results of filtered image using circle and hexagon shaped filters
Fig. 7. Results of filtered image using circle and hexagon shaped filters
Table 1. Comparison of PSNR using circular and hexagon shaped filters
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