Terms
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Definitions
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Binary image
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An image containing only black and white pixels. In MATLAB, a binary image is represented as a logical array of 0's and 1's (which usually represent black and white, respectively). This documentation often uses the variable name BW to represent a binary image in memory.
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Image type
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The defined relationship between array values and pixel colors. The toolbox supports binary, indexed, intensity, and RGB image types.
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Indexed image
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An image whose pixel values are direct indices into an RGB colormap. In MATLAB, an indexed image is represented by an array of class uint8, uint16, or double. The colormap is always an m-by-3 array of class double. We often use the variable name X to represent an indexed image in memory, and map to represent the colormap.
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Intensity image
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An image consisting of intensity (grayscale) values. In MATLAB, intensity images are represented by an array of class uint8, uint16, or double. While intensity images are not stored with colormaps, MATLAB uses a system colormap to display them. We often use the variable name I to represent an intensity image in memory. This term is synonymous with the term grayscale.
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Multiframe image
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An image file that contains more than one image, or frame. When in MATLAB memory, a multiframe image is a 4-D array where the fourth dimension specifies the frame number. This term is synonymous with the term multipage image.
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RGB image
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An image in which each pixel is specified by three values--one each for the red, green, and blue components of the pixel's color. In MATLAB, an RGB image is represented by an m-by-n-by-3 array of class uint8, uint16, or double. We often use the variable name RGB to represent an RGB image in memory.
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Storage class
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The numeric storage class used to store an image in MATLAB. The storage classes used in MATLAB are uint8, uint16, and double. Some function descriptions in the reference chapter of this User's Guide have a section entitled "Class Support" that specifies which image classes the function can operate on. When this section is absent, the function can operate on all supported storage classes.
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