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  2. Edge detection - Wikipedia

    en.wikipedia.org/wiki/Edge_detection

    Edge thinning is a technique used to remove the unwanted spurious points on the edges in an image. This technique is employed after the image has been filtered for noise (using median, Gaussian filter etc.), the edge operator has been applied (like the ones described above, Canny or Sobel) to detect the edges and after the edges have been ...

  3. Binary image - Wikipedia

    en.wikipedia.org/wiki/Binary_image

    A binary image can be stored in memory as a bitmap, a packed array of bits. A 640×480 image requires 37.5 KiB of storage. Because of the small size of the image files, fax machine and document management solutions usually use this format. Most binary images also compress well with simple run-length compression schemes.

  4. Afterimage - Wikipedia

    en.wikipedia.org/wiki/Afterimage

    An afterimage in general is an optical illusion that refers to an image continuing to appear after exposure to the original image has ceased. Prolonged viewing of the colored patch induces an afterimage of the complementary color (for example, yellow color induces a bluish afterimage).

  5. Image file format - Wikipedia

    en.wikipedia.org/wiki/Image_file_format

    An image file format is a file format for a digital image. There are many formats that can be used, such as JPEG , PNG , and GIF . Most formats up until 2022 were for storing 2D images, not 3D ones.

  6. Censorship of images in the Soviet Union - Wikipedia

    en.wikipedia.org/wiki/Censorship_of_images_in...

    Later Soviet sources claimed that the extra watch was actually an Adrianov compass [9] and that Khaldei, in order to avoid controversy, doctored the photo to remove the watch from Ismailov's right wrist. [10] [11] Khaldei also copied smoke in the background of another photo to make the scene more dramatic. [11]

  7. Contrast (vision) - Wikipedia

    en.wikipedia.org/wiki/Contrast_(vision)

    Contrast is the difference in luminance or color that makes an object (or its representation in an image or display) visible against a background of different luminance or color. The human visual system is more sensitive to contrast than to absolute luminance; thus, we can perceive the world similarly despite significant changes in illumination ...

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