Approach to model human appearance based on sparse representation for human tracking in surveillance

• Main Author: Sangeetha Damotharasamy
• Format: Article
• Language: English
• Published: Wiley 2020-09-01
• Series: IET Image Processing
• Subjects: minimal reconstruction error; target template; local appearance; varying illumination environment; robust tracking algorithm; fine representation
• Online Access: https://doi.org/10.1049/iet-ipr.2018.5961

In human tracking, sparse representation successfully localises the human in a video with minimal reconstruction error using target templates. However, the state‐of‐the‐art approaches use colour and local appearance of a human to discriminate the human from the background regions, and hence fail when the human is occluded and appears in the varying illumination environment. In this study, a robust tracking algorithm is proposed that utilises gradient orientation and fine and coarse sparse representation of the target template. Sparse representation‐based human appearance model utilises weighted gradient orientation that is insensitive to illumination variation. Coarse and fine representation of sparse code facilitates tracking under varying scales. Subspace learning from image gradient orientation is enforced with occlusion detection during the dictionary updation stage to capture the visual characteristics of the local human appearance that supports tracking under partial occlusion with lesser tracking error. The proposed human tracking algorithm is evaluated on various datasets and shows efficient human tracking performance when compared to the other state‐of‐the‐art approaches. Furthermore, the proposed human tracking algorithm is suitable for surveillance applications.