CS 143 / Project 1 / Image Filtering and Hybrid Images
Look at image on right from very close, then from far away.
Hybrid images are static images that change in interpretation as a function of the viewing distance. 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. By blending the high frequency portion of one image with the low-frequency portion of another, you get a hybrid image that leads to different interpretations at different distances. We use image filtering to generate low frequency and high frequency images.
- Hybrid Images.A hybrid image is the sum of a low-pass filtered version of the one image and a high-pass filtered version of a second image.
- Image filtering.Image filtering (or convolution) is a fundamental image processing tool.
Results
| High pass image | Low pass image | Hybrid image | Visualize image |
|---|---|---|---|
|
|||
|
|||
|
|||
|
|||
|
|||
- Gaussian blur for removing the high frequency
- Cutoff frequency = 7
- High pass image = 1 - low pass image
- Reflect across edge for boundary cases