Size Reduction: Greyscale Image Test

For my second image, I used a grey-scale picture of Ingrid Daubechies, which was included with the S-Plus Wavelets toolkit.

Comparing the 64x64 images with the original 256x256 version:
Original Image
Pixel Skipping
Pixel Averaging
Discrete Wavelet Transform
All three methods give a good representation of the original. The Pixel Averaged image is fuzzier than the other two, and the DWT image preserves the details (such as the edges of the glasses and the lock of hair on her forehead) better than the other two. This is especially obvious if the images are expanded back to the original size.

Go to the next example: Color Image Go to the last example: Binary Image Go to the main text: Image Size Reduction Algorithms