← Computer vision
Lesson 3 of 4
Vision tasks
Watch, read the card, then practise. Object detection · Segmentation
The video for this lesson is being recorded.
Meanwhile, the notes below and the 60-second cards cover the same ideas.
Practise this topicObject detection
Object detection finds what is in an image and where, with a box, a class and a confidence for each object.
Remember: IoU = overlap area ÷ combined area.
Segmentation
Segmentation labels every pixel, giving exact outlines instead of boxes.
Remember: Use segmentation when the exact shape matters.
Try the example in Code Lab
overlap = 25 union = 100 + 100 - overlap print(round(overlap / union, 2))