Table 1 Proposed image compression and decompression applied to greyscale images (original image size = 1.37Â MB)
From: A novel high-frequency encoding algorithm for image compression
Image name | Block size used by DCT | Factor | Compressed image size (KB) | Bit rate/pixel | 2D RMSE | 3D RMSE |
|---|---|---|---|---|---|---|
FACE1 | \( 16\times 16 \) | 5 | 34.2 | 0.024 | 4.0 | 1.45 |
\( 16\times 16 \) | 10 | 18.3 | 0.012 | 5.12 | 2.48 | |
\( 32\times 32 \) | 5 | 20.7 | 0.014 | 4.79 | 2.25 | |
\( 32\times 32 \) | 10 | 11 | 0.007 | 5.83 | 2.36 | |
\( 64\times 64 \) | 10 | 6.4 | 0.0045 | 6.65 | 2.57 | |
FACE2 | \( 16\times 16 \) | 5 | 21.98 | 0.015 | 2.65 | 1.11 |
\( 16\times 16 \) | 10 | 12.25 | 0.0086 | 3.32 | 1.45 | |
\( 32\times 32 \) | 5 | 14.47 | 0.01 | 3.12 | 0.98 | |
\( 32\times 32 \) | 10 | 7.94 | 0.0056 | 3.8 | 4.0 |