Main Content

colorize

Estimate color image of hyperspectral data

所有的页面崩溃

Syntax

coloredImage = colorize(hcube)
coloredImage = colorize(hcube,band)
[coloredImage,indices] = colorize(___)
___= colorize(___,Name,Value)

Description

example

coloredImage= colorize(hcube)estimates a false-color image of hyperspectral data based on the three most informative bands of thehypercubeobjecthcube.

coloredImage= colorize(hcube,band)returns a false-color image using the specified spectral bandsband.

example

[coloredImage,indices] = colorize(___)returns the indices of the bands used in the color image.

___= colorize(___,Name,Value)specifies options using one or more name-value pair arguments in addition to any combination of arguments from previous syntaxes. Use this syntax to specify the options to estimate false-colored and color-infrared (CIR) images of the input data.

Note

This function requires theImage Processing Toolbox™ Hyperspectral Imaging Library. You can install theImage Processing Toolbox Hyperspectral Imaging Libraryfrom Add-On Explorer. For more information about installing add-ons, seeGet and Manage Add-Ons.

Examples

collapse all

This example uses:

Open Live Script

Read a hyperspectral data into the workspace.

hcube = hypercube('paviaU.dat');

Estimate a false-color image of the hyperspectral data.

coloredImg = colorize(hcube);

Display the false-color image.

imshow(coloredImg)

This example uses:

Open Live Script

Read a hyperspectral data into the workspace.

hcube = hypercube('paviaU.dat');

Estimate an RGB image of the hyperspectral data. Increase the image contrast by applying contrast stretching.

coloredImg = colorize(hcube,"Method","rgb","ContrastStretching",true);

Display the contrast-stretched RGB image.

imshow(coloredImg)

Input Arguments

collapse all

Input hyperspectral data, specified as ahypercubeobject. TheDataCubeproperty of thehypercubeobject stores the hyperspectral data cube as anM-by-N-by-Cnumeric array, whereCis the number of bands.

Spectral band numbers, specified as a 3-element vector of positive integers. All elements of the vector must be less than or equal to the total number of bandsCin the input data.

Data Types:double

Name-Value Arguments

Specify optional pairs of arguments asName1=Value1,...,NameN=ValueN, whereNameis the argument name andValueis the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Before R2021a, use commas to separate each name and value, and encloseNamein quotes.

Example:colorize(hcube,'Method','rgb')

Method used to visualize the bands, specified as the comma-separated pair consisting of'Method'和其中的一个选项。

  • 'falsecolored'— Create a false-color image consisting of the three most informative bands selected usingselectBandsfunction.

  • 'rgb'— Create an RGB image by dividing the spectral range into red (R), green (G), and blue (B) bands. The red band ranges from 600 nm to 700 nm, the green band ranges from 500 nm to 600 nm, and the blue band ranges from 400 nm to 500 nm. The displayed R, G, and B channels consist of the most representative bands within the corresponding spectral range based on the correlation coefficient metric.

  • 'cir'— Create a color-infrared (CIR) image by dividing the spectral range into near infrared (NIR), R, and G bands. The NIR band ranges from 760 nm to 960 nm, the red band ranges from 600 nm to 700 nm, and the green band ranges from 500 nm to 600 nm. The displayed channels consist of the most representative bands within the corresponding spectral range based on the correlation coefficient metric.

To create RGB or CIR images, theWavelengthproperty of thehypercubeobjecthcubemust have wavelengths in each of the corresponding ranges.

Data Types:char|string

Perform contrast stretching of the image, specified as the comma-separated pair consisting of'ContrastStretching'and the logical0(false) or1(true). Whentruethecolorizefunction applies contrast-limited adaptive histogram equalization, using theadapthisteqfunction.

Data Types:logical

Output Arguments

collapse all

Color image, returned as anM-by-N-by-3 numeric array. Each of the three color planes contains one band of the hyperspectral image.

Data Types:single|double

Indices of the selected bands, returned as a 3-element column vector of positive integers.

Data Types:double

Version History

Introduced in R2020a

See Also

|