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Example images from observer study to determine spatial frequencies of useful content. Left column: two examples from the CL2 dataset. Second column: log magnitude of Fourier transform of the original image. Third column: Results of bandpass filtering. Right column: User‐adjustable bandpass filter. The observer selected 0.051‐0.254 cycles/mm for the top image and 0.079‐0.289 cycles/mm for the lower image. The scales are the pixel coordinates from the top left corner
