Cuboid Grouping
Cuboid Grouping allows users to link multiple cuboids that move together in the real world—maintaining their relative positions throughout a sequence. This is particularly useful when tracking objects that are physically connected or consistently aligned. The grouping helps improve annotation accuracy, ensures spatial consistency, and reduces the need for manual frame-by-frame adjustments. It’s a good and lean feature, enhancing both annotation quality and workflow efficiency without adding complexity.
Useful when tracking objects that are physically connected or consistently aligned.
Use Case
Agri-Tech – Tractor with a Towed Implement Grouping ensures the implement maintains a fixed offset behind the tractor across the sequence, saving time and reducing annotation drift.
Autonomous Driving – Cabin and a Trailer Helps track multi-part vehicles moving together while preserving their orientation and spacing.
Benefits
Good: Maintains consistent spatial relationships between grouped cuboids, improving annotation accuracy across frames.
Lean: Reduces manual alignment work, especially in sequences where linked objects appear across long spans.
Flexible: Grouping can be applied and ungrouped selectively over any frame range, offering precise control.
Steps to Use Cuboid Grouping
Multi-select cuboids to be grouped by holding down the Ctrl key.
Hover over the cuboid that should lead the group, then right-click (contextual click).
Choose ‘Group’ from the context menu.
The grouping feature will confirm the range and prevent the user from providing a range where both annotations are not present.
To ungroup:
Navigate to the frame where the grouping should end.
Right-click the lead cuboid and select ‘Ungroup’.
The ungroup will confirm the range the ungrouping action should be applied to.
Tip: Use grouping to avoid drift and rework when dealing with attached or coordinated objects that stay aligned throughout a sequence.
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