Object Detection2026-11-11computer‑visionobject‑detectioniounon‑maximum‑suppressionselective‑searchr‑cnnfaster‑r‑cnnanchorsyolossdfocal‑lossretinanetfeature‑pyramidmean‑average‑precisioncomp9517agenticFinding what is in an image and where: IoU and non-maximum suppression, region proposals, the R-CNN line from R-CNN to Faster R-CNN, one-stage detectors, focal loss with feature pyramids, and how detectors are scored.