IMAGING GLOSSARY
Histogram (imaging)A tabulation of pixel value populations displayed as
a bar chart where the x-axis represents all the possible pixel values and
the y-axis is the total image count of each given pixel value.
A histogram counts how many pixels in the image have a given intensity
value or range of values. Each histogram intensity value or range of values
is called a bin. Each bin contains a positive number that represents the
number of pixels in the image that fall within the bin's range.
A typical 8-bit gray-scale histogram contains 256 bins. Each bin has a
range of a single intensity value. Bin 0 contains the number of pixels in
the image that have a gray-scale value of 0 or black; bin 255 contains the
number of white (255) pixels. When the collection of bins are sorted (0-255)
and charted, the graph displays the intensity distributions of all the
images pixels.
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