Fig. 1. Example of TerraSAR-X image data. We display in (a) the modulus of a SAR image u : Ω → C, and in (b) the modulus of û over a single period Ω̂ (high values are displayed in dark, low values in bright, white meaning zero). The Fourier spectrum (b) reveals the presence of zero-padding (û is zero everywhere outside of a rectangular sub-frequency domain ω̂ ( Ω̂ delimited by the red dashed line), showing that the image u was oversampled.
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