Block 118: Template Matching
Find a pattern or sub-image within a larger image.
Concepts
- cv2.matchTemplate() methods: TM_CCOEFF_NORMED
- cv2.minMaxLoc() to find match location
- Drawing bounding box on the match
- Limitations of template matching
Code Examples
See exercise below.
Exercise
Create a small patch from an image and find it using template matching. Draw a rectangle around all matches above a threshold (multi-match).
Homework
What are the main limitations of template matching? When would you need a more powerful approach? Friday