Paint every region, classify each object, trace clean boundaries, and improve segmentation accuracy through guided challenges, instant feedback, analytics, and creative practice for everyone.
Evaluate a completed mask to see detailed feedback.
| Class | IoU | Dice | Precision | Recall | Pixels sampled |
|---|
| # | Player | Score | Accuracy | Mean IoU | Mode |
|---|
Select the class that matches an image region. Paint the complete area without crossing its visible boundary. Evaluate your work for pixel, overlap, boundary, and efficiency scores.
Keyboard numbers select palette classes. Brackets change brush size. Control or Command plus Z restores the previous mask state.
Semantic segmentation assigns a class to every pixel. Instance segmentation also separates different objects sharing one class. Panoptic segmentation combines both tasks.
Intersection over Union measures overlap between predicted and correct masks. Dice score gives another overlap measure. Boundary accuracy focuses on object edges.
Segmentation helps autonomous vehicles understand roads and people. Medical systems outline organs or suspicious regions. Mapping systems classify land, water, crops, and buildings.
Balanced classes matter because large backgrounds can hide poor object performance. Inspect per-class scores instead of relying only on total accuracy.
An image stores visible colours and textures. A mask stores class labels for pixels. This game displays masks using class-specific colours.
A large background may dominate the image. Mean IoU gives each class more balanced importance. Review recall for smaller objects.
The smart brush stays inside the truth region touched at stroke start. It demonstrates edge-aware assistance while still requiring class selection.
Green pixels were classified correctly. Red pixels were wrong or left unpainted. Strong red boundaries reveal localisation problems.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.