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2. Cropping (image) - Wikipedia

   en.wikipedia.org/wiki/Cropping_(image)

   Cropping is the removal of unwanted outer areas from a photographic or illustrated image. The process usually consists of the removal of some of the peripheral areas of an image to remove extraneous visual data from the picture, improve its framing, change the aspect ratio, or accentuate or isolate the subject matter from its background.

3. Hair removal - Wikipedia

   en.wikipedia.org/wiki/Hair_removal

   Hair removal. Anterior view of major and minor (lighter color) body hair growth areas in anatomically typical females and males. Hair removal, also known as epilation or depilation, is the deliberate removal of body hair or head hair . Hair typically grows all over the human body and can vary in thickness and length across human populations.

4. Top-hat transform - Wikipedia

   en.wikipedia.org/wiki/Top-hat_transform

   In mathematical morphology and digital image processing, a top-hat transform is an operation that extracts small elements and details from given images.There exist two types of top-hat transform: the white top-hat transform is defined as the difference between the input image and its opening by some structuring element, while the black top-hat transform is defined dually as the difference ...

5. Stain removal - Wikipedia

   en.wikipedia.org/wiki/Stain_removal

   Soaking. This is a common method used in households to remove a variety of stains. Depending on the stains composition, the stained material is left to soak in a container of warm or cool water and solvent. Such solvents can include laundry detergent, bleach, peroxide, vinegar, or a cleaning product with enzymes.

6. Graph cuts in computer vision - Wikipedia

   en.wikipedia.org/wiki/Graph_cuts_in_computer_vision

   We usually use two distributions: one for background modelling and another for foreground pixels. Use a Gaussian mixture model (with 5–8 components) to model those 2 distributions. Goal: Try to pull apart those two distributions. Texon. A texon (or texton) is a set of pixels that has certain characteristics and is repeated in an image. Steps:

7. Noise reduction - Wikipedia

   en.wikipedia.org/wiki/Noise_reduction

   Noise reduction is the process of removing noise from a signal. Noise reduction techniques exist for audio and images. Noise reduction algorithms may distort the signal to some degree. Noise rejection is the ability of a circuit to isolate an undesired signal component from the desired signal component, as with common-mode rejection ratio .