Design and implementation of a binocular stereo vision-based three-dimensional distance measurement method for situs anterior flexion

Objective: To design a stereoscopic ranging method for anterior flexion ranging using binocular stereo vision technology, and to verify its accuracy. Methods: A binocular camera was used to acquire the test images of the subjects, and OpenPose, an open source framework for human posture recognition, was used to intelligently detect the key points of the hands and reconstruct the 3D coordinates of the key points to complete the distance measurement. Results: A total of 240 sets of binocular images of seated forward bending were collected, and the maximum value was 2.1 mm, the minimum error was 0.1 mm, the average error was within 0.5 mm, and the standard deviation was 0.29. Conclusion: The accuracy of seated forward bending measurement was improved, and it can be applied to the measurement of seated forward bending in school physical fitness test.