Technical GlossaryComputer Vision

Two-Stage Detector

An architectural approach that first proposes candidate regions and then classifies them for more precise object detection.

Two-stage detectors are strong in settings where precision and box quality matter more than raw speed. In the first stage, regions likely to contain objects are proposed, and in the second stage these regions are evaluated in more detail. This can be advantageous in challenging settings such as small objects, crowded scenes, and medical imagery. Faster R-CNN is one of the classic examples of this approach.