Fig. 1

Interlaced BI-RL with 2×2 rectangularly-down-sampled blocks. The observed image g of size 200×200, which is blurred by a Gaussian PSF k of size 41×41, is decomposed to 2×2 rectangularly-down-sampled blocks. The starting image f ⁰ is computed from g by RL. The first sub-iteration of interlaced BI-RL updates pixel values on Ω ₁ by using g ^[1] as the observed data and f ⁰ as the starting image. The resulting image of this process is f ^1/4. The second sub-iteration of interlaced BI-RL updates pixel values on Ω ₂ by using g ^[2] as the observed data and f ^1/4 as the starting image. The resulting image of this process is f ^2/4. Similarly, the third and fourth sub-iterations of interlaced BI-RL update pixel values on Ω ₃ and Ω ₄. This completes one iteration of interlaced BI-RL with four blocks