Simulated image: six segment lines, height = 100, and width = 1,2,4,8,16,32. Pixel values on the lines are 1, and 0 outside.

Left Simulated image + Gaussian noise (sigma=1), and right, filtered image by the ridgelet transform (block size = 128).

Left Simulated image + Gaussian noise (sigma=2), and right, filtered image by the ridgelet transform (block size = 128).

Left Simulated image + Gaussian noise (sigma=5), and right, filtered image by the ridgelet transform (block size = 128).

Left Simulated image + Gaussian noise (sigma=10), and right, filtered image by the ridgelet transform (block size = 128).