Figure 3From: Sparse CT reconstruction based on multi-direction anisotropic total variation (MDATV) The Shepp-Logan phantom and edges. (a) The original Shepp-Logan phantom with display gray scale window of [0,1], (b) its horizontal edges E h , (c) rotated horizontal edges E hr , (d) gradient image with display gray scale window of [0,0.01], and (e) vertical edges E v , (f) rotated vertical edges E vr . The edges are rotated counterclockwise by 45°.Back to article page