Hybrid Image of Bird and Plane
The goal of this assignment is to write an image filtering function and use it to create hybrid images. These images are perceived in a different manner by human eyes depending on distance from the screen. The basic idea is that high frequency tends to dominate perception when it is available, but, at a distance, only the low frequency (smooth) part of the signal can be seen. Therefore, blending both high frequency part of one image and low frequency part of another image, we form an hybrid image. The two step process involved:
The image on the right top of this page shows a hybrid image formed using a plane and a bird. Here, the low frequencies of plane are retained and added with the high frequencies of bird. The resultant hybrid image after addition is seen.
Image 1 - LPF | Image 2 - HPF | Hybrid Image = Image 1 + Image 2 | Downsampling |
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The above shown are five pairs of hybrid images with their downsampled versions. For each pair, the high frequency image, low frequency component image is also shown. Different cut off frequency is used for different pairs. For Marilyn and Einstein it is kept to 3, whereas for fish and submarine its modified to 5. For others, it's kept at 7. The effect of both images being present in the hybrid image is seen clearly with downsampling.