Motion Digitizer

Now on iPad: digitize video frame by frame with your finger or Apple Pencil, check stick figures and trajectories, and reconstruct 3D motion with DLT.

Motion Digitizer turns video into coordinate data for biomechanics, sports science, physical education and coaching.

Open a video from Files or Photos, then digitize body landmarks frame by frame with a tap or Apple Pencil. The stick figure, trajectories and coordinate table update as you work, so you can check your data at a glance.

DIGITIZE • Frame-by-frame digitizing with finger taps or Apple Pencil, with a magnifier for precise placement • Your own points and stick-figure segments; save point setups and reuse them • Start and end frames and sampling rate for high-speed video (for example 120 or 240 fps) • Trajectories for the current point or for all points

EDIT • Spreadsheet-style coordinate table: tap a cell to jump to that frame and point • Select ranges, copy and paste, and delete • Fill gaps with Catmull-Rom spline interpolation

ANALYZE • Multiple cameras, synchronized by a sync signal • 2D DLT (8 or 15 coefficients) for real-world coordinates on a plane • 3D DLT with two or more cameras to reconstruct 3D coordinates, with epipolar lines, world axes and grid guides • 3D stick-figure view

SHARE • Export coordinates as text files (comma, tab or space delimited; .asc, .2d, .3d and more) • Import coordinate files • Export videos with stick figures and trajectories overlaid

MOTION DIGITIZER PRO Digitizing and viewing are free. Motion Digitizer Pro unlocks saving projects and all exports (coordinates and video). One subscription works on both iPad and Mac.

• Monthly and yearly subscriptions are available. Eligible new subscribers get a 7-day free trial. • Payment is charged to your Apple Account at confirmation of purchase. • The subscription renews automatically unless it is canceled 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 or cancel your subscription in your Apple Account settings after purchase. • Any unused portion of a free trial is forfeited when you purchase a subscription.

To open the purchase screen: tap the Save or Export button, or open Settings (gear icon) > Motion Digitizer Pro.

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