I want to learn Computer Vision. Where should I start?

To start learning computer vision, focus on three areas: foundational concepts, practical implementation, and machine learning integration. Begin by understanding core principles like image representation (pixels, color spaces), basic operations (filtering, edge detection), and coordinate systems. Learn to use libraries like OpenCV and Pillow for hands-on experimentation. For example, use OpenCV in Python to load an image, convert it to grayscale, and apply a Gaussian blur. This helps you grasp how algorithms process visual data. Study linear algebra basics (matrices, transformations) and calculus concepts (gradients) since they underpin many computer vision techniques.

Next, explore machine learning fundamentals, as modern computer vision relies heavily on neural networks. Start with convolutional neural networks (CNNs) using frameworks like TensorFlow or PyTorch. Train a simple CNN to classify handwritten digits using the MNIST dataset, which introduces key ideas like layers, activation functions, and backpropagation. Then experiment with pre-trained models like ResNet or MobileNet for tasks such as object recognition. For instance, use PyTorch’s TorchVision library to load a pre-trained ResNet model and classify images from the CIFAR-10 dataset. This bridges theory with real-world applications while teaching transfer learning—a critical skill for efficient model training.

Finally, build projects that solve concrete problems. Create an object detection system using YOLO to identify specific items in webcam footage, or implement image segmentation with U-Net for medical imaging analysis. Use OpenCV to track moving objects in video streams using optical flow. Participate in Kaggle competitions like the Dogs vs. Cats classification challenge to test your skills. Leverage open-source datasets like COCO or ImageNet for realistic scenarios. For example, train a model to detect kitchen utensils in COCO images. Contribute to open-source computer vision projects or replicate papers from arXiv to deepen your understanding. Consistent practice with real datasets and tools will solidify your expertise.