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. 2016 Oct 5;43(11):5889–5902. doi: 10.1118/1.4963812

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© 2016 American Association of Physicists in Medicine.

0094-2405/2016/43(11)/5889/14/$30.00

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FIG. 4. — Pooled histogram features from the discriminative coefficient matrix. $f (\cdot)$ = pooling technique; α = sparse code.