Give an account of various image enhancement techniques.

Image enhancement refers to the process of improving the visual appearance of an image or making certain features more discernible. Various techniques are employed to achieve this goal, each tailored for specific types of enhancement, such as improving contrast, sharpness, brightness, or reducing noise. The core aim of these techniques is to bring out more meaningful details from an image or to prepare it for further analysis in applications like medical imaging, satellite photography, and computer vision.

One of the primary categories of image enhancement techniques is spatial domain methods, which directly manipulate the pixels in an image. These methods typically involve applying filters to the image. For instance, point operations can alter the pixel values individually, and _________ _______ _____ _________ _____ __________ _________ __________ ____.
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