Door & Frame Segmentation

Project overview

Interior doors were segmented into the four components a decorator would treat separately: the leaf itself, the frame it hangs in, the architrave around the opening and the skirting that runs into it.

The classes are narrow, often only a few pixels wide where a frame meets a wall, and they meet each other at mitred joints that have to be cut correctly for the result to look right when a single component is recoloured.

Work performed

• Traced the door leaf including any glazing bars or panel mouldings.
• Separated the frame from the leaf along the rebate, including where the door stands open.
• Cut architrave as its own class and followed the mitre at each corner.
• Continued skirting behind the architrave only as far as it remained visible.
• Annotated doors seen at an angle, where perspective compresses one side of the frame.
• Checked narrow classes at high zoom to confirm they had not been merged into the wall.

What made it hard

• Frame and architrave are only a few pixels apart at typical listing resolution.
• Mitred corners need a clean diagonal cut rather than a squared-off approximation.
• Open doors show the frame rebate, which belongs to a different class than the face.
• White-on-white schemes give almost no contrast between leaf, frame and wall.
• Angled views compress the far side of the frame to a sliver.
• Skirting runs behind furniture and reappears, which breaks the mask into fragments.

Result

A component-level door dataset supporting independent refinishing of leaf, frame, architrave and skirting, with clean mitres and no merged narrow classes.

Final deliverable

Delivered four-class polygon masks per door, reviewed specifically for narrow-class integrity and mitre accuracy.