Motion Calibrator

Digitize your calibration video, solve DLT parameters, check the error point by point, and export. Lens distortion, 3D reconstruction and scaling included. iPad and Mac.

Motion Calibrator calibrates cameras for motion analysis. Digitize the control points in your calibration video, solve the DLT parameters, check the calibration error point by point, and export a DLT file for each camera. You can then reconstruct the 3D coordinates of digitized motion with the calibrated cameras. Works on iPad and Mac.

DLT CALIBRATION • 3D DLT (11 parameters) and DLT with lens distortion correction (12, 14 and 16 parameters) • 2D DLT (8 parameters). You can also compute a 2D DLT for any analysis plane (X–Z, Y–Z or X–Y) from a 3D DLT • Import control point coordinates from text or CSV, or type them into a table (mm, cm or m) • Import coordinates digitized in other software (CSV or ASCII) and solve the DLT without video • Slow-motion videos from Photos are imported as the original, without speed ramps

DIGITIZING • Frame-by-frame stepping, zoom, and a loupe for Apple Pencil • Reprojection error for each point, and excluding outliers

ACCURACY CHECKS • 3D view of the camera positions and orientations with the control points, colored by error • Reprojection error per camera, 3D reconstruction error (RMS and max), leave-one-out validation, and error for each camera combination • For 2D, a plot of the error on the analysis plane • Find the lens distortion model with the smallest validation error • Copy the accuracy (mean ± SD) for your paper or report

3D RECONSTRUCTION • Import Motion Digitizer .dtzj files or ASCII files per camera, and compute 3D coordinates with the calibrated DLT • Check them in a 3D animation and export as .rd, .asc, .csv and more

SCALING FROM A KNOWN LENGTH • Convert single-camera coordinates to real length (m) from a scale of known length (2 points on the analysis plane, or 4 points in front of and behind it) • Works with panning shots. Check in a 2D animation and export

FILES • Save control points, digitizing and settings together in a calibration file (.mcal) and open it on another device • DLT files are plain text, one coefficient per line, one file per camera

FREE FEATURES AND SUBSCRIPTION Importing, digitizing, solving the DLT, checking the error, and 3D reconstruction with animation are free. You can also export a single-camera 2D DLT (without distortion correction) and scaled coordinates for free.

Saving and exporting 3D, distortion-corrected or multi-camera DLTs, calibration files, digitized coordinates and 3D coordinates requires a subscription (monthly or yearly). A one-week free trial is available.

• Payment is charged to your Apple Account at confirmation of purchase. • The subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours before the end of the current period. • You can manage your subscription and turn off auto-renew in your Apple Account settings after purchase. • Any unused portion of a free trial is forfeited when you purchase a subscription.

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