Image processing in machine learning involves various techniques to extract or enhance information from images, with applications ranging from medical imaging to remote sensing. The article discusses six prominent methods: image restoration, which uses a degradation model to reverse deterioration effects; linear filtering, which employs convolution to transform pixel values; independent component analysis (ICA) to separate mixed signals; pixelation, where images are resized to observable pixel levels; template matching, a simple object detection method by aligning a template over a larger image; and image generation using Generative Adversarial Networks (GANs), where a generator and discriminator improve each other to create realistic images. Each technique offers unique advantages and applications, emphasizing the importance of experience in selecting the appropriate method for specific machine learning projects.