Table 2 Proposed image compression and decompression applied to colour images (original image size = 3.75Â MB)
From: A novel high-frequency encoding algorithm for image compression
Image name | Block size used by DCT | Factor F for each layer [Y, Cb, Cr] | Compressed image size (KB) | Bit rate/pixel | 2D RMSE | 3D RMSE |
|---|---|---|---|---|---|---|
WALL | \( 64\times 64 \) | [5,5,5] | 14 | 0.0036 | 2.4 | 0.25 |
\( 64\times 64 \) | [10, 10, 10] | 7.6 | 0.0019 | 2.8 | 2.11 | |
\( 64\times 64 \) | [25, 25,25] | 5.0 | 0.001 | 3.5 | 0.59 | |
CORNER | \( 32\times 32 \) | [10,10,10] | 20 | 0.0052 | 5.34 | 0.14 |
\( 32\times 32 \) | [20, 20, 20] | 10 | 0.0026 | 6.7 | 0.65 | |
\( 64\times 64 \) | [30, 30,30] | 5.1 | 0.0013 | 8.26 | 2.08 | |
METAL | \( 32\times 32 \) | [2, 25, 25] | 25.2 | 0.0065 | 4.19 | 1.89 |
\( 32\times 32 \) | [5, 25, 25] | 13.4 | 0.0034 | 4.48 | 2.04 | |
\( 64\times 64 \) | [5, 25, 25] | 9.8 | 0.0025 | 4.73 | 2.00 |