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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. Opening (morphology) - Wikipedia

   en.wikipedia.org/wiki/Opening_(morphology)

   The images below present a simple opening-by-reconstruction example which extracts the vertical strokes from an input text image. Since the original image is converted from grayscale to binary image, it has a few distortions in some characters so that same characters might have different vertical lengths.

4. Kernel (image processing) - Wikipedia

   en.wikipedia.org/wiki/Kernel_(image_processing)

   The nearest border pixels are conceptually extended as far as necessary to provide values for the convolution. Corner pixels are extended in 90° wedges. Other edge pixels are extended in lines. Wrap The image is conceptually wrapped (or tiled) and values are taken from the opposite edge or corner. Mirror The image is conceptually mirrored at ...

5. Edge-preserving smoothing - Wikipedia

   en.wikipedia.org/wiki/Edge-preserving_smoothing

   Anisotropic diffusion generates small conductance at the location of the edge of the image to prevent the heat flow over the edge, thus making the anisotropic diffusion filter edge-preserving. In the graph-based interpretation, the small conductance corresponds to a small weight of an edge of the graph describing a probability of a random walk ...

6. Template:Remove border - Wikipedia

   en.wikipedia.org/wiki/Template:Remove_border

   This image (or all images in this article or category) needs to have its border removed. This may also refer to rectangular solid or translucent space around and/or beside the image that needs to be removed to center the image better. Where borders are desired, they should be added with wikimarkup or code.

7. 9-slice scaling - Wikipedia

   en.wikipedia.org/wiki/9-slice_scaling

   9-slice scaling (also known as Scale 9 grid, 9-slicing or 9-patch) is a 2D image resizing technique to proportionally scale an image by splitting it in a grid of nine parts. [1] The key idea is to prevent image scaling distortion by protecting the pixels defined in 4 parts (corners) of the image and scaling or repeating the pixels in the other ...