*Article* **Human Height Estimation by Color Deep Learning and Depth 3D Conversion**

#### **Dong-seok Lee 1, Jong-soo Kim 2, Seok Chan Jeong 3 and Soon-kak Kwon 1,\***


Received: 7 July 2020; Accepted: 9 August 2020; Published: 10 August 2020

**Abstract:** In this study, an estimation method for human height is proposed using color and depth information. Color images are used for deep learning by mask R-CNN to detect a human body and a human head separately. If color images are not available for extracting the human body region due to low light environment, then the human body region is extracted by comparing between current frame in depth video and a pre-stored background depth image. The topmost point of the human head region is extracted as the top of the head and the bottommost point of the human body region as the bottom of the foot. The depth value of the head top-point is corrected to a pixel value that has high similarity to a neighboring pixel. The position of the body bottom-point is corrected by calculating a depth gradient between vertically adjacent pixels. Two head-top and foot-bottom points are converted into 3D real-world coordinates using depth information. Two real-world coordinates estimate human height by measuring a Euclidean distance. Estimation errors for human height are corrected as the average of accumulated heights. In experiment results, we achieve that the estimated errors of human height with a standing state are 0.7% and 2.2% when the human body region is extracted by mask R-CNN and the background depth image, respectively.

**Keywords:** human-height estimation; depth video; depth 3D conversion; artificial intelligence; convolutional neural networks
