What Are Features?
A feature is a piece of information in an image that is relevant to solving a certain problem. It could be something as simple as a single pixel value, or more complex like edges, corners, and shapes. You can combine multiple simple features into a complex feature.
Applying certain operations to an image produces information that could be considered a feature as well. Computer vision and image processing have a large collection of useful features and feature-extracting operations.
Basically, any inherent or derived property of an image could be used as a feature to solve tasks.
00:33 These features are derived from modifying the original image in some meaningful way. We might intuitively think of facial features as the parts of our face, like the nose, the mouth, or the eyes. Soon, we’ll learn about digital image features called Haar-like features, which can be used to detect the presence of our own facial features.
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