Device-free activity recognition plays a crucial role in smart building, security, and human–
computer interaction, which shows its strength in its convenience and cost-efficiency …

In this correspondence, we propose a novel method to extract illumination insensitive
features for face recognition under varying lighting called the Gradientfaces. Theoretical …

A face image can be represented by a combination of large-and small-scale features. It is
well-known that the variations of illumination mainly affect the large-scale features (low …

The task of action recognition in dark videos is useful in various scenarios, eg, night
surveillance and self-driving at night. Though progress has been made in action recognition …

Illumination processing is a challenging task in face recognition. Although numerous
techniques have been proposed to tackle this problem, none of them can achieve high …

Recognizing human faces in various lighting conditions is quite a difficult problem. The
problem becomes more difficult when face images are taken in extremely high dynamic …

Face recognition under varying lighting conditions is challenging, especially for single
image based recognition system. Exacting illumination invariant features is an effective …

Face recognition is one of a complex biometrics in the field of pattern recognition due to the
constraints imposed by variation in the appearance of facial images. These changes in …

Illumination problem is still a bottleneck of robust face recognition system, which demands
extracting illumination invariant features. In this field, existing works only consider the …

The invention relates to a method of representing a virtual object in a view of a real
environment which comprises the steps of providing image information of a first image of at …