How to learn computer vision?

To learn computer vision, start by building a strong foundation in mathematics, programming, and core concepts. Focus on linear algebra (vectors, matrices, transformations), calculus (derivatives, integrals for understanding algorithms), and basic statistics (probability distributions, data analysis). Python is the most practical language for computer vision due to its extensive libraries. Learn to use NumPy for numerical operations and OpenCV for basic image processing tasks like filtering, edge detection, and color space conversions. For example, use OpenCV’s cv2.Canny() function to detect edges in an image or cv2.cvtColor() to convert RGB images to grayscale. Understanding these tools and operations will help you manipulate and analyze images programmatically.

Next, move to practical projects and machine learning integration. Start with simple tasks like building a face detection system using Haar cascades in OpenCV or implementing image classification with pre-trained models like ResNet via TensorFlow or PyTorch. As you progress, explore machine learning techniques such as training a convolutional neural network (CNN) from scratch on datasets like MNIST or CIFAR-10. For example, use PyTorch’s nn.Conv2d layers to create a CNN that classifies handwritten digits. Experiment with frameworks like Keras or Fast.ai for higher-level abstractions. Dive into object detection with models like YOLO or Mask R-CNN, and try implementing semantic segmentation using architectures like U-Net. Platforms like Kaggle offer datasets and competitions to test your skills.

Finally, deepen your knowledge by exploring advanced topics and staying updated. Study topics like generative adversarial networks (GANs) for image synthesis, 3D computer vision with depth sensors like LiDAR, or real-time video processing with techniques like optical flow. Read research papers from conferences like CVPR or ICCV to understand state-of-the-art methods. For example, implement a GAN using PyTorch to generate synthetic faces or use OpenCV’s calcOpticalFlowFarneback() to track motion in video frames. Engage with the community through GitHub (contribute to open-source projects), forums like Stack Overflow, and tutorials on Medium or Towards Data Science. Continuous practice, experimentation, and applying theory to real-world problems are key to mastering computer vision.