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Scaling

Scaling can be performed by a diagonal matrix, M ∈ R2x2, as shown here:

Here, S_v denotes the scale factor along the vertical direction, and S_h denotes the scale factor along the horizontal direction (see Figure 2.6 for an illustration). We can also choose to follow up the scaling with a translation, by having a nonzero translation vector, b:

Figure 2.6 Image scaling of the retina

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