Fig. 5

Plot of a vertical, b horizontal and c diagonal wavelet coefficients of frame no. 130 from Intelligent Room video sequence: The grey colour line shows the original shadow pixels, and the arrow mark in grey colour indicates the end of the shadow points. The blue colour square indicates the detected shadow pixels using skewness, and the arrow mark in blue colour indicates the end of the shadow points. The black and red squares indicate the detected shadow pixels using standard deviation [26] (σ) and relative standard deviation [27] (σ/μ)