Research Article
Underwater Acoustic Image Encoding Based on Interest Region and Correlation Coefficient
Table 1
8 kinds of isometric transformations.
| Index | Transformation name | Transformed pixel |
| 1 | Identity transformation | | 2 | Axisymmetric reflection on the vertical axis | | 3 | Axisymmetric reflections on the horizontal | | 4 | Symmetric reflection on the main diagonal | | 5 | Symmetric reflection on the sub-diagonal | | 6 | 90° counterclockwise about the center | | 7 | 180° counterclockwise about the center | | 8 | 270° counterclockwise about the center | |
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