Annotate

1. Start Annotation

1.1 Manual Annotation

Click the Draw Polygon button [C] in the toolbar to start manually annotating a polygon.

Manual annotation offers two methods: clicking and dragging.

1.1.1 Clicking Method

Clicking is the most common annotation method, with each click adding a polygon vertex.

1.1.2 Dragging Method

By pressing and holding the left mouse button and dragging the mouse, (0.15s per point)

Tip

With the Dragging method, you can easily draw curves.

1.1.3 Shift Key Constraint

Hold the Shift key while drawing to constrain lines to horizontal, vertical, or 45-degree angles.

Tip

This feature is useful for annotating objects with regular shapes like buildings, documents, or signs. The line will automatically snap to the nearest 0°, 45°, 90°, 135°, or 180° direction.

1.2 Semi-automatic Annotation

Utilizes SAM with point and bounding box prompts.

1.2.1 Point Prompt

Click the Segment anything point button [Q] in the toolbar to start SAM point prompt.

1.2.2 Box Prompt

Click the Segment anything box button [W] in the toolbar to start SAM box prompt.

1.2.3 Text Prompt

Since v1.5.0, ISAT supports the text prompt function based on sam3.

Input a prompt text for prediction.

Using the categories set in ISAT to prediction.

1.2.4 Visual Prompt

Since v1.5.2, ISAT supports the visual prompt function based on sam3.

Use the positive box and negative box for prediction.

2. Finish Annotation

Click the Finish annotation button [E] in the toolbar to end the annotation.

When using sam point prompt or box prompt, finish annotation will convert the mask into a polygon on the canvas.

Tip

ISAT offers multiple conversion methods, which you can find in the settings interface.

Contour mode:

External contours

Only max contour

All contours

For detailed usage, please refer to Contour mode.

3. Cancel Annotation

Click the Cancel annotation button [Esc] in the toolbar to end the annotation.

4. Backspace

Click the Backspace button [Z] in the toolbar to return to the previous annotation state.

5. Video Annotation

ISAT uses SAM2 or SAM3 for video annotation, provides the functions of annotating the next frame, the next five frames, and the entire video.

Tip

Video annotation process:

Select SAM2, SAM2.1 or SAM3 model.
Start the video annotation with an already annotated frame.
Click the Video segment once button or Video segment five times button or Video segment button.