Challenge settings
Scene 1
0.50
90 seconds
Score
0
Timer
--:--
Streak
0
Boxes
0/0
Detection canvas
Press Start Challenge, then drag around every object.
Target: All classes
Level: 1
D draw V select Delete remove Ctrl+Z undo
Drag corners to resize. Double-click a box to change its class.
Evaluation summary
Not evaluatedIoU average
0.000
Precision
0.0%
Recall
0.0%
F1 score
0.0%
mAP estimate
0.0%
Centre error
0 px
0
True positives
0
False positives
0
False negatives
Detailed feedback
Your localisation feedback will appear here.
Performance analytics
Custom image and annotations
Coordinates are normalised from zero to one.
Session leaderboard
| # | Player | Score | Accuracy | Mode |
|---|---|---|---|---|
| No scores yet. | ||||
Challenge history
| Round | Scene | Mode | Score | IoU | Precision | Recall | Time |
|---|---|---|---|---|---|---|---|
| Complete a round to create history. | |||||||
How to play and learn
Steps
- Choose a mode, difficulty, class, and IoU threshold.
- Press Start Challenge and drag boxes tightly around objects.
- Choose the correct class before drawing each box.
- Submit detections to compare them with ground truth.
- Review IoU, errors, charts, and suggested adjustments.
IoU formula
IoU = Intersection Area ÷ Union Area
Glossary
- True positive
- A correctly classified box meeting the IoU threshold.
- False positive
- An incorrect class, duplicate box, or weak overlap.
- False negative
- A ground-truth object that was not detected.
- Precision
- The share of submitted boxes that were correct.
- Recall
- The share of real objects successfully detected.