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. Author manuscript; available in PMC: 2011 Mar 31.
Published in final edited form as: Opt Express. 2010 Dec 6;18(25):26441–26449. doi: 10.1364/OE.18.026441

Fig. 6.

Fig. 6

Image magnitudes before and after unconstrained modes were removed from HIO reconstructions with various missing center sizes for σ = 4.6 cell (top row) and σ = 7.5 cell (bottom row). Up to 13 missing speckles, the artifacts in reconstructed images are negligible in both cases. Unconstrained mode removal works well up to 21 missing speckles for the σ = 4.6 cell, and 30 for the σ = 7.5 cell. Above that level, artifacts cannot be completely removed. When the missing speckle number is greater than 48, permanent artifacts are present in images in both cases.