A binary image is a
digital imagethat has only two possible values for each pixel. cite news |url=http://www.codersource.net/csharp_color_image_to_binary.aspx |title=Conversion of a Color Image to a Binary Image |publisher=CoderSource.net |date=2005-04-18 |accessdate=2008-06-11] Typically the two colors used for a binary image are black and white though any two colors can be used. The color used for the object(s) in the image is the foreground color while the rest of the image is the background color.
Binary images are also called "bi-level" or "two-level". (The names "black-and-white", "B&W",
monochromeor monochromatic are often used for this concept, but may also designate any images that have only one sample per pixel, such as grayscale images.) In Photoshopparlance, a binary image is the same as an image in "Bitmap" mode.
Binary images often arise in
digital image processingas masks or as the result of certain operations such as segmentation, thresholding, and dithering. Some input/output devices, such as laser printers, fax machines, and bilevel computer displays, can only handle bilevel images.
The interpretation of the pixel's binary value is also device-dependent. Some systems interprets the bit value of 0 as black and 1 as white, while others reversed the meaning of the values. These are known as "vanilla" and "chocolate" flavours in the
TWAINstandard PC interface for scannersand digital cameras.
A binary image is usually stored in memory as a
bitmap, a packed array of bits.
Binary images can be interpreted as
subsets of the "two-dimensional integer lattice" "Z"2; the field of morphological image processingwas largely inspired by this view.
Connected component labeling
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