At this stage, through Pairing_Color_Unit, the input RGB image is paired in six opposing color channel pairs: R-R, R-G, R-B, G-G, G-B and B-B [1,35,48]. These pairs are then concatenated, which gives 12 channels, R, R, R, G, R, B, G, G, G, B, B, B, as illustrated in Figure 3. This is the step for choosing the color channels to oppose. The set of concatenated color channels is then fed to the encoder.
Pairing_Color_Unit: input RGB color image is transformed in 6 opposing color channel pairs; these are then concatenated to obtain 12 color channels.
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