Performing covert biometric recognition in surveillance environments has been regarded as a grand challenge, considering the adversity of the conditions where recognition should be carried out (e.g., poor resolution, bad lighting, off-pose and partially occluded data). This special issue compiles a group of approaches to this problem.
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Proença et al. (2018) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: