What are best method for feature extraction in image?

The best method for feature extraction depends on the specific application and dataset. Classical methods like Scale-Invariant Feature Transform (SIFT), Histogram of Oriented Gradients (HOG), and Speeded-Up Robust Features (SURF) are effective for detecting edges, textures, and shapes in images. These methods work well for traditional applications like object tracking and image matching. For more complex tasks, deep learning-based methods, such as convolutional neural networks (CNNs), are widely used. Layers in CNNs automatically learn hierarchical features from raw pixel data, making them highly effective for tasks like classification and object detection. Pre-trained models like VGG, ResNet, and EfficientNet can be fine-tuned for specific feature extraction needs. Additionally, attention-based models like Vision Transformers (ViT) have gained popularity for their ability to capture global relationships in images. Combining classical and deep learning methods can sometimes yield the best results, especially in hybrid workflows.