Representation of the distribution of colors in an image
Not to be confused with Image histogram.
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In image processing and photography, a color histogram is a representation of the distribution of colors in an image. For digital images, a color histogram represents the number of pixels that have colors in each of a fixed list of color ranges, that span the image's color space, the set of all possible colors.
The color histogram can be built for any kind of color space, although the term is more often used for three-dimensional spaces such as RGB or HSV. For monochromatic images, the term intensity histogram may be used instead. For multi-spectral images, where each pixel is represented by an arbitrary number of measurements (for example, beyond the three measurements in RGB), the color histogram is N-dimensional, with N being the number of measurements taken. Each measurement has its own wavelength range of the light spectrum, some of which may be outside the visible spectrum.
If the set of possible color values is sufficiently small, each of those colors may be placed on a range by itself; then the histogram is merely the count of pixels that have each possible color. Most often, the space is divided into an appropriate number of ranges, often arranged as a regular grid, each containing many similar color values. The color histogram may also be represented and displayed as a smooth function defined over the color space that approximates the pixel counts.
Like other kinds of histograms, the color histogram is a statistic that can be viewed as an approximation of an underlying continuous distribution of color values.
and photography, a colorhistogram is a representation of the distribution of colors in an image. For digital images, a colorhistogram represents the number...
Histogram equalization is a method in image processing of contrast adjustment using the image's histogram. This method usually increases the global contrast...
An image histogram is a type of histogram that acts as a graphical representation of the tonal distribution in a digital image. It plots the number of...
processing, histogram matching or histogram specification is the transformation of an image so that its histogram matches a specified histogram. The well-known...
the 15-bit truncated color values can be used in the next step to create a smaller histogram. Also, since each 15-bit binary color vector is presumably...
employs the statistical properties of the images is histogram matching. This is a classic algorithm for color transfer, but it can suffer from the problem that...
The histogram of oriented gradients (HOG) is a feature descriptor used in computer vision and image processing for the purpose of object detection. The...
computes the difference between the histograms of two consecutive frames; a histogram is a table that contains for each color within a frame the number of pixels...
algorithm would create a confidence map in the new image based on the colorhistogram of the object in the previous image, and use mean shift to find the...
Image editors have provisions to create an image histogram of the image being edited. The histogram plots the number of pixels in the image (vertical...
highly accurate. Histogram intersection can be used. To do this, a colorhistogram in the intersecting areas is compared to the colorhistogram of the two objects...
usually develops. It is normally diagnosed using ultrasonography and a colorhistogram or clinically by evaluating the infant's passive cervical range of...
The categories (bars) must be adjacent. Histogram (Color). In computer graphics and photography, a colorhistogram is a representation of the distribution...
better. Histogram equalization is a non-linear transform which maintains pixel rank and is capable of normalizing for any monotonically increasing color transform...
clusters in the image. Color or intensity can be used as the measure. A refinement of this technique is to recursively apply the histogram-seeking method to...
resizing, cropping, and red-eye reduction. Users can view a photo's colorhistogram, which allows them to adjust the photo's shadows, highlights and sharpness...
(ii). Color-code the output distribution. When all output values are assigned scenario indices, they are plotted as series in a stacked histogram, visually...
Annual IEEE. IEEE, 2009. Lingala, Mounika; et al. (2014). "Fuzzy logic color detection: Blue areas in melanoma dermoscopy images". Computerized Medical...
as the bars may not accurately represent the data. In such cases, a histogram or box plot may be more appropriate. May be misleading: Bar charts can...
improved by histogram equalization. Smoothing method In drawing, if there is some dissatisfied color, taking some color around dissatisfied color and averaging...
this time, most color quantization was done using the population algorithm or population method, which essentially constructs a histogram of equal-sized...
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