Compare And Analyze Of The Errors For Photogrammetry

Reserch intention:An significant part of Biomechanics studies is on how to obtain scientific and authentic kinematic parameters in order to illuminate the nature of movement from Biomechanics perspective. Improved accuracy of statistics is imperative to meet the requirements for an in-depth understanding of technical details of human motions and more faithful results.Currently,photographic image analysis has been a major method in parameter research of Human Biomechnics.Reserch method:Panning photographic measuring method,three-dimensional photographic measuring method.Reserch conclusion and suggestion:1,In the panning photographic method,the bigger the image of markers is,the smaller the error is and the horizontal direction produces smaller errors than the vertical direction.In addition,the angle of the camera main axis and the vertical direction should within 20°.2,In the three-dimensional photographic measuring method,the control point should be well-distributed in the control space.The larger the number of control point,the higher the calibration accuracy.When the radius of the control space within 4.5 meters,the calibration accuracy has reduces;when the radius of the control space within 6 meters and within 7.5 meters,the calibration accuracy remarkable drop.3.In the three-dimensional photographic measuring method,if the movement exceed the control space,we suggest that markers should at the two sides of the control point in the imaging of the two camera. Simultaneously the angle of cameras' main axis in 60°to 120°,the smaller the angle,the better the calibration accuracy. 4,In the three-dimensional photographic measuring method, calibration accuracy will be better when the image is larger.But it is not the image bigger well,if the image is too large,the lens distortion can reduce the calibration accuracy in edge of the image.5,In the three-dimensional photographic measuring method,in the control space,SIMI,Ariel and ShiXun analysis systems basically have the same calibration accuracy.Out of the control space,the error of the Ariel and ShiXun analysis systems is basically the same,but the error of the SIMI is larger.And the error of DLTI6 algorithm in the SIMI analysis systems is larger than the other three algorithms,the cause need advanced research.