Sample images of one person from the AR database.

<p>Sample images of one person from the AR database.</p

Comparisons of related works.

<p>Comparisons of related works.</p

Impact of patch size on PMR (1–5 denote the training sample size per subject).

<p>Impact of patch size on PMR (1–5 denote the training sample size per subject).</p

Training (the first row) and testing (the second row) sample images of a person in the Extended Yale B database.

<p>Training (the first row) and testing (the second row) sample images of a person in the Extended Yale B database.</p

Sample images of the LFW database.

<p>Sample images of the LFW database.</p

Diagram of patch-based matrix regression for face recognition.

<p>Diagram of patch-based matrix regression for face recognition.</p

(a) Original image; (b) observed image; (c) error image; (d) rearranged error image; (e) distributions of error image; and (f) distributions of singular values of error image.

<p>(a) Original image; (b) observed image; (c) error image; (d) rearranged error image; (e) distributions of error image; and (f) distributions of singular values of error image.</p

Recognition rate curves of PMR and MSPMR versus the variations in the regularization parameter in different face recognition scenarios.

<p>Recognition rate curves of PMR and MSPMR versus the variations in the regularization parameter in different face recognition scenarios.</p

Recognition rates (%) on the AR database testing with scarves.

<p>Recognition rates (%) on the AR database testing with scarves.</p

Training and testing images of a person in the AR database.

<p>Training and testing images of a person in the AR database.</p