Posture estimation system, posture estimation apparatus, error correction method, and error correction program

A posture estimation system comprising:

• a marker that is mounted on an object;
• a camera that captures an image of the object;
• an analysis section that analyzes a posture of the object on a basis of a position of the marker included in a captured image captured by the camera;
• an inertial measurement section that is provided on the object to detect motion of the object;
• a calculation section that calculates calculated posture information indicating the posture of the object on a basis of detection information indicating a detection result from the inertial measurement section;
• an estimation section that estimates the posture of the object on a basis of the calculated posture information and analyzed posture information indicating the posture of the object analyzed by the analysis section;
• and
• a correction section that corrects an error included in the calculated posture information on a basis of the analyzed posture information,
• wherein the analyzed posture information includes a time stamp indicating a timing of image capturing of the captured image for which the analyzed posture information has been obtained by analysis,
• wherein the detection information includes a time stamp indicating a timing of detection of motion of the object by the inertial measurement section,
• wherein a sampling rate of the inertial measurement section is greater than a sampling rate of the image capturing, and
• wherein the correction section corrects a current piece of the calculated posture information on a basis of a difference between the analyzed posture information and the calculated posture information calculated on a basis of the detection information including a time stamp closest to the time stamp included in the analyzed posture information.