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(a) True dictionary
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(b) Training data (a part)
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(c) NMFSC 77
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(d) NN-KSVD 72
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(e) NMF -H 86
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(f) PCDDL 89
Figure 6: (a) True dictionary composed of 90 atoms. (b) Part of the total training data. (c)–(f) Learned dictionaries from NMFSC, NN-KSVD, NMF -H, and PCDDL algorithms. The numbers of learned atoms are 77, 72, 86, and 89, respectively. Note that these resulting dictionaries have been realigned to facilitate comparison with the original dictionary.