Human Skeleton Detection from Semi-constrained Environment Video Topics: Color and Texture Analyses; Event and Human Activity Recognition; Image Enhancement and Restoration; Object Detection and Localization; Segmentation and Grouping; Shape Representation and Matching In Proceedings of the 12th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications - Volume 5 VISAPP: VISAPP, 384-389, 2017 , Porto, Portugal