opencv
OpenCV
OpenCV is the fundamental library for Image Processing. v5.0 (2025) modernizes deep learning support and licensing.
When to Use
- Image Manipulation: Resizing, cropping, color space conversion (BGR -> RGB).
- Classic CV: Edge detection (Canny), Feature matching (SIFT/ORB).
- Video I/O: Reading/Writing webcams or video files.
Core Concepts
BGR
OpenCV reads images as Blue-Green-Red (not RGB) by default. History quirks.
cv::Mat
The core matrix structure (in C++). In Python, it's just a NumPy array.
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