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Comparison of Matlab functions and Ops

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  • The intention is to help developers switch from MATLAB to Ops by showing equivalent operations.

Import, Export, and Conversion

Read and Write Image Data from Files

| imread

| Read image from graphics file

| imwrite

| Write image to graphics file

| imfinfo

| Information about graphics file

| nitfinfo

| Read metadata from National Imagery Transmission Format (NITF) file

| nitfread

| Read image from NITF file

| dpxinfo

| Read metadata from DPX file

| dpxread

| Read DPX image

| analyze75info

| Read metadata from header file of Analyze 7.5 data set

| analyze75read

| Read image data from image file of Analyze 7.5 data set

| interfileinfo

| Read metadata from Interfile file

| interfileread

| Read images in Interfile format

Read and Write Image Data from DICOM Files

| dicomanon

| Anonymize DICOM file

| dicomdict

| Get or set active DICOM data dictionary

| dicomdisp

| Display DICOM file structure

| dicominfo

| Read metadata from DICOM message

| dicomlookup

| Find attribute in DICOM data dictionary

| dicomread

| Read DICOM image

| dicomuid

| Generate DICOM unique identifier

| dicomwrite

| Write images as DICOM files

High Dynamic Range Images

| hdrread

| Read high dynamic range (HDR) image

| hdrwrite

| Write Radiance high dynamic range (HDR) image file

| makehdr

| Create high dynamic range image

| tonemap

| Render high dynamic range image for viewing

Large Image Files

| ImageAdapter

| Interface for image I/O

| isrset

| Check if file is R-Set

| openrset

| Open R-Set file

| rsetwrite

| Create reduced resolution data set from image file

Image Type Conversion

| gray2ind

| Convert grayscale or binary image to indexed image

| ind2gray

| Convert indexed image to grayscale image

| mat2gray

| Convert matrix to grayscale image

| rgb2gray

| Convert RGB image or colormap to grayscale

| ind2rgb

| Convert indexed image to RGB image

| label2rgb

| Convert label matrix into RGB image

| demosaic

| Convert Bayer pattern encoded image to truecolor image

| imbinarize

| Binarize image by thresholding

| imquantize

| Quantize image using specified quantization levels and output values

| multithresh

| Multilevel image thresholds using Otsu's method

| adaptthresh

| Adaptive image threshold using local first-order statistics

| otsuthresh

| Global histogram threshold using Otsu's method

| graythresh

| Global image threshold using Otsu's method

| grayslice

| Convert grayscale image to indexed image using multilevel thresholding

| im2double

| Convert image to double precision

| im2int16

| Convert image to 16-bit signed integers

| im2java2d

| Convert image to Java buffered image

| im2single

| Convert image to single precision

| im2uint16

| Convert image to 16-bit unsigned integers

| im2uint8

| Convert image to 8-bit unsigned integers

Color

| rgb2lab

| Convert RGB to CIE 1976 L*a*b*

| rgb2ntsc

| Convert RGB color values to NTSC color space

| rgb2xyz

| Convert RGB to CIE 1931 XYZ

| rgb2ycbcr

| Convert RGB color values to YCbCr color space

| lab2rgb

| Convert CIE 1976 L*a*b* to RGB

| lab2xyz

| Convert CIE 1976 L*a*b* to CIE 1931 XYZ

| xyz2lab

| Convert CIE 1931 XYZ to CIE 1976 L*a*b*

| xyz2rgb

| Convert CIE 1931 XYZ to RGB

| ycbcr2rgb

| Convert YCbCr color values to RGB color space

| ntsc2rgb

| Convert NTSC values to RGB color space

| lab2double

| Convert L*a*b* data to double

| lab2uint16

| Convert L*a*b* data to uint16

| lab2uint8

| Convert L*a*b* data to uint8

| xyz2double

| Convert XYZ color values to double

| xyz2uint16

| Convert XYZ color values to uint16

| iccfind

| Search for ICC profiles

| iccread

| Read ICC profile

| iccroot

| Find system default ICC profile repository

| iccwrite

| Write ICC color profile to disk file

| isicc

| True for valid ICC color profile

| makecform

| Create color transformation structure

| applycform

| Apply device-independent color space transformation

| imapprox

| Approximate indexed image by reducing number of colors

| colorcloud

| Display 3-D color gamut as point cloud in specified color space

| whitepoint

| XYZ color values of standard illuminants

Synthetic Images

| checkerboard

| Create checkerboard image

| phantom

| Create head phantom image

| imnoise

| Add noise to image

Display and Exploration

Basic Display

| imshow

| Display image

| montage

| Display multiple image frames as rectangular montage

| immovie

| Make movie from multiframe image

| implay

| Play movies, videos, or image sequences

| warp

| Display image as texture-mapped surface

| iptgetpref

| Get values of Image Processing Toolbox preferences

| iptprefs

| Display Image Processing Toolbox Preferences dialog box

| iptsetpref

| Set Image Processing Toolbox preferences or display valid values

Interactive Exploration with the Image Viewer App

| imtool

| Image Viewer app

| imageinfo

| Image Information tool

| imcontrast

| Adjust Contrast tool

| imdisplayrange

| Display Range tool

| imdistline

| Distance tool

| impixelinfo

| Pixel Information tool

| impixelinfoval

| Pixel Information tool without text label

| impixelregion

| Pixel Region tool

| immagbox

| Magnification box for scroll panel

| imoverview

| Overview tool for image displayed in scroll panel

| iptgetpref

| Get values of Image Processing Toolbox preferences

| iptprefs

| Display Image Processing Toolbox Preferences dialog box

| iptsetpref

| Set Image Processing Toolbox preferences or display valid values

Build Interactive Tools

| imageinfo

| Image Information tool

| imcolormaptool

| Choose Colormap tool

| imcontrast

| Adjust Contrast tool

| imcrop

| Crop image

| imdisplayrange

| Display Range tool

| imdistline

| Distance tool

| impixelinfo

| Pixel Information tool

| impixelinfoval

| Pixel Information tool without text label

| impixelregion

| Pixel Region tool

| impixelregionpanel

| Pixel Region tool panel

| immagbox

| Magnification box for scroll panel

| imoverview

| Overview tool for image displayed in scroll panel

| imoverviewpanel

| Overview tool panel for image displayed in scroll panel

| imsave

| Save Image Tool

| imscrollpanel

| Scroll panel for interactive image navigation

| imellipse

| Create draggable ellipse

| imfreehand

| Create draggable freehand region

| imline

| Create draggable, resizable line

| impoint

| Create draggable point

| impoly

| Create draggable, resizable polygon

| imrect

| Create draggable rectangle

| imroi

| Region-of-interest (ROI) base class

| getline

| Select polyline with mouse

| getpts

| Specify points with mouse

| getrect

| Specify rectangle with mouse

| getimage

| Image data from axes

| getimagemodel

| Image model object from image object

| imagemodel

| Image Model object

| axes2pix

| Convert axes coordinates to pixel coordinates

| imattributes

| Information about image attributes

| imgca

| Get current axes containing image

| imgcf

| Get current figure containing image

| imgetfile

| Display Open Image dialog box

| imhandles

| Get all image objects

| iptaddcallback

| Add function handle to callback list

| iptcheckhandle

| Check validity of handle

| iptgetapi

| Get Application Programmer Interface (API) for handle

| iptGetPointerBehavior

| Retrieve pointer behavior from graphics object

| ipticondir

| Directories containing IPT and MATLAB icons

| iptPointerManager

| Create pointer manager in figure

| iptremovecallback

| Delete function handle from callback list

| iptSetPointerBehavior

| Store pointer behavior structure in graphics object

| iptwindowalign

| Align figure windows

| makeConstrainToRectFcn

| Create rectangularly bounded drag constraint function

| truesize

| Adjust display size of image

Geometric Transformation, Spatial Referencing, and Image Registration

Geometric Transformations

| imcrop

| Crop image

| imresize

| Resize image

| imrotate

| Rotate image

| imtranslate

| Translate image

| impyramid

| Image pyramid reduction and expansion

| imwarp

| Apply geometric transformation to image

| fitgeotrans

| Fit geometric transformation to control point pairs

| imtransform

| Apply 2-D spatial transformation to image

| findbounds

| Find output bounds for spatial transformation

| fliptform

| Flip input and output roles of TFORM structure

| makeresampler

| Create resampling structure

| maketform

| Create spatial transformation structure (TFORM)

| tformarray

| Apply spatial transformation to N-D array

| tformfwd

| Apply forward spatial transformation

| tforminv

| Apply inverse spatial transformation

| checkerboard

| Create checkerboard image

| affine2d

| 2-D Affine Geometric Transformation

| affine3d

| 3-D Affine Geometric Transformation

| projective2d

| 2-D Projective Geometric Transformation

| images.geotrans.PiecewiseLinearTransformation2D

| 2-D piecewise linear geometric transformation

| images.geotrans.PolynomialTransformation2D

| 2-D Polynomial Geometric Transformation

| images.geotrans.LocalWeightedMeanTransformation2D

| 2-D Local Weighted Mean Geometric Transformation

Spatial Referencing

| imwarp

| Apply geometric transformation to image

| imregister

| Intensity-based image registration

| imregtform

| Estimate geometric transformation that aligns two 2-D or 3-D images

| imshow

| Display image

| imshowpair

| Compare differences between images

| imfuse

| Composite of two images

| imref2d

| Reference 2-D image to world coordinates

| imref3d

| Reference 3-D image to world coordinates

Automatic Registration

| imregister

| Intensity-based image registration

| imregconfig

| Configurations for intensity-based registration

| imregtform

| Estimate geometric transformation that aligns two 2-D or 3-D images

| imregcorr

| Estimates geometric transformation that aligns two 2-D images using phase correlation

| imregdemons

| Estimate displacement field that aligns two 2-D or 3-D images

| imfuse

| Composite of two images

| imshowpair

| Compare differences between images

| registration.metric.MattesMutualInformation

| Mattes mutual information metric configuration object

| registration.metric.MeanSquares

| Mean square error metric configuration object

| registration.optimizer.RegularStepGradientDescent

| Regular step gradient descent optimizer configuration object

| registration.optimizer.OnePlusOneEvolutionary

| One-plus-one evolutionary optimizer configuration object

Control Point Registration

| cpselect

| Control Point Selection Tool

| fitgeotrans

| Fit geometric transformation to control point pairs

| cpcorr

| Tune control-point locations using cross correlation

| cpstruct2pairs

| Convert CPSTRUCT to valid pairs of control points

| normxcorr2

| Normalized 2-D cross-correlation

| cp2tform

| Infer spatial transformation from control point pairs

Image Enhancement

Contrast Adjustment

| imadjust

| Adjust image intensity values or colormap

| imcontrast

| Adjust Contrast tool

| imsharpen

| Sharpen image using unsharp masking

| locallapfilt

| Fast Local Laplacian Filtering of images

| localcontrast

| Edge-aware local contrast manipulation of images

| localtonemap

| Render HDR image for viewing while enhancing local contrast

| histeq

| Enhance contrast using histogram equalization

| adapthisteq

| Contrast-limited adaptive histogram equalization (CLAHE)

| imhistmatch

| Adjust histogram of image to match N-bin histogram of reference image

| decorrstretch

| Apply decorrelation stretch to multichannel image

| stretchlim

| Find limits to contrast stretch image

| intlut

| Convert integer values using lookup table

| imnoise

| Add noise to image

Image Filtering

| imfilter

| N-D filtering of multidimensional images

| imgaussfilt

| 2-D Gaussian filtering of images

| imgaussfilt3

| 3-D Gaussian filtering of 3-D images

| fspecial

| Create predefined 2-D filter

| imguidedfilter

| Guided filtering of images

| normxcorr2

| Normalized 2-D cross-correlation

| wiener2

| 2-D adaptive noise-removal filtering

| medfilt2

| 2-D median filtering

| medfilt3

| 3-D median filtering

| ordfilt2

| 2-D order-statistic filtering

| stdfilt

| Local standard deviation of image

| rangefilt

| Local range of image

| entropyfilt

| Local entropy of grayscale image

| nlfilter

| General sliding-neighborhood operations

| gabor

| Create Gabor filter or Gabor filter bank

| imgaborfilt

| Apply Gabor filter or set of filters to 2-D image

| imboxfilt

| 2-D box filtering of images

| imboxfilt3

| 3-D box filtering of 3-D images

| integralImage

| Calculate integral image

| integralImage3

| Calculate 3-D integral image

| integralBoxFilter

| 2-D box filtering of integral images

| integralBoxFilter3

| 3-D box filtering of 3-D integral images

| bwareafilt

| Extract objects from binary image by size

| bwpropfilt

| Extract objects from binary image using properties

| padarray

| Pad array

| freqz2

| 2-D frequency response

| fsamp2

| 2-D FIR filter using frequency sampling

| ftrans2

| 2-D FIR filter using frequency transformation

| fwind1

| 2-D FIR filter using 1-D window method

| fwind2

| 2-D FIR filter using 2-D window method

| convmtx2

| 2-D convolution matrix

Morphological Operations

| bwhitmiss

| Binary hit-miss operation

| bwmorph

| Morphological operations on binary images

| bwulterode

| Ultimate erosion

| bwareaopen

| Remove small objects from binary image

| imbothat

| Bottom-hat filtering

| imclearborder

| Suppress light structures connected to image border

| imclose

| Morphologically close image

| imdilate

| Dilate image

| imerode

| Erode image

| imextendedmax

| Extended-maxima transform

| imextendedmin

| Extended-minima transform

| imfill

| Fill image regions and holes

| imhmax

| H-maxima transform

| imhmin

| H-minima transform

| imimposemin

| Impose minima

| imopen

| Morphologically open image

| imreconstruct

| Morphological reconstruction

| imregionalmax

| Regional maxima

| imregionalmin

| Regional minima

| imtophat

| Top-hat filtering

| watershed

| Watershed transform

| conndef

| Create connectivity array

| iptcheckconn

| Check validity of connectivity argument

| applylut

| Neighborhood operations on binary images using lookup tables

| bwlookup

| Nonlinear filtering using lookup tables

| makelut

| Create lookup table for use with bwlookup

| strel

| Morphological structuring element

| offsetstrel

| Morphological offset structuring element

Deblurring

| deconvblind

| Deblur image using blind deconvolution

| deconvlucy

| Deblur image using Lucy-Richardson method

| deconvreg

| Deblur image using regularized filter

| deconvwnr

| Deblur image using Wiener filter

| edgetaper

| Taper discontinuities along image edges

| otf2psf

| Convert optical transfer function to point-spread function

| psf2otf

| Convert point-spread function to optical transfer function

| padarray

| Pad array

ROI-Based Processing

| roipoly

| Specify polygonal region of interest (ROI)

| poly2mask

| Convert region of interest (ROI) polygon to region mask

| regionfill

| Fill in specified regions in image using inward interpolation

| roicolor

| Select region of interest (ROI) based on color

| roifilt2

| Filter region of interest (ROI) in image

| imellipse

| Create draggable ellipse

| imfreehand

| Create draggable freehand region

| impoly

| Create draggable, resizable polygon

| imrect

| Create draggable rectangle

| imroi

| Region-of-interest (ROI) base class

Neighborhood and Block Processing

| ImageAdapter

| Interface for image I/O

| blockproc

| Distinct block processing for image

| bestblk

| Determine optimal block size for block processing

| nlfilter

| General sliding-neighborhood operations

| col2im

| Rearrange matrix columns into blocks

| colfilt

| Columnwise neighborhood operations

| im2col

| Rearrange image blocks into columns

Image Arithmetic

| imabsdiff

| Absolute difference of two images

| imadd

| Add two images or add constant to image

| imapplymatrix

| Linear combination of color channels

| imcomplement

| Complement image

| imdivide

| Divide one image into another or divide image by constant

| imlincomb

| Linear combination of images

| immultiply

| Multiply two images or multiply image by constant

| imsubtract

| Subtract one image from another or subtract constant from image

Image Analysis

Object Analysis

| bwboundaries

| Trace region boundaries in binary image

| bwtraceboundary

| Trace object in binary image

| visboundaries

| Plot region boundaries

| edge

| Find edges in intensity image

| imfindcircles

| Find circles using circular Hough transform

| viscircles

| Create circle

| imgradient

| Gradient magnitude and direction of an image

| imgradientxy

| Directional gradients of an image

| imgradient3

| Find 3-D gradient magnitude and direction of images

| imgradientxyz

| Find the directional gradients of a 3-D image

| hough

| Hough transform

| houghlines

| Extract line segments based on Hough transform

| houghpeaks

| Identify peaks in Hough transform

| qtdecomp

| Quadtree decomposition

| qtgetblk

| Block values in quadtree decomposition

| qtsetblk

| Set block values in quadtree decomposition

Region and Image Properties

| regionprops

| Measure properties of image regions

| bwarea

| Area of objects in binary image

| bwareafilt

| Extract objects from binary image by size

| bwconncomp

| Find connected components in binary image

| bwconvhull

| Generate convex hull image from binary image

| bwdist

| Distance transform of binary image

| bwdistgeodesic

| Geodesic distance transform of binary image

| bweuler

| Euler number of binary image

| bwperim

| Find perimeter of objects in binary image

| bwpropfilt

| Extract objects from binary image using properties

| bwselect

| Select objects in binary image

| graydist

| Gray-weighted distance transform of grayscale image

| imcontour

| Create contour plot of image data

| imhist

| Histogram of image data

| impixel

| Pixel color values

| improfile

| Pixel-value cross-sections along line segments

| corr2

| 2-D correlation coefficient

| mean2

| Average or mean of matrix elements

| std2

| Standard deviation of matrix elements

| bwlabel

| Label connected components in 2-D binary image

| bwlabeln

| Label connected components in binary image

| labelmatrix

| Create label matrix from bwconncomp structure

| bwpack

| Pack binary image

| bwunpack

| Unpack binary image

Texture Analysis

| entropy

| Entropy of grayscale image

| entropyfilt

| Local entropy of grayscale image

| rangefilt

| Local range of image

| stdfilt

| Local standard deviation of image

| graycomatrix

| Create gray-level co-occurrence matrix from image

| graycoprops

| Properties of gray-level co-occurrence matrix

Image Quality

| immse

| Mean-squared error

| psnr

| Peak Signal-to-Noise Ratio (PSNR)

| ssim

| Structural Similarity Index (SSIM) for measuring image quality

Image Segmentation

| activecontour

| Segment image into foreground and background using active contour

| imsegfmm

| Binary image segmentation using Fast Marching Method

| imseggeodesic

| Segment image into two or three regions using geodesic distance-based color segmentation

| gradientweight

| Calculate weights for image pixels based on image gradient

| graydiffweight

| Calculate weights for image pixels based on grayscale intensity difference

| grayconnected

| Select contiguous image region with similar gray values

| graythresh

| Global image threshold using Otsu's method

| multithresh

| Multilevel image thresholds using Otsu's method

| otsuthresh

| Global histogram threshold using Otsu's method

| adaptthresh

| Adaptive image threshold using local first-order statistics

| boundarymask

| Find region boundaries of segmentation

| superpixels

| 2-D superpixel oversegmentation of images

| superpixels3

| 3-D superpixel oversegmentation of 3-D image

| imoverlay

| Burn binary mask into 2-D image

| label2idx

| Convert label matrix to cell array of linear indices

Image Transforms

| bwdist

| Distance transform of binary image

| bwdistgeodesic

| Geodesic distance transform of binary image

| graydist

| Gray-weighted distance transform of grayscale image

| hough

| Hough transform

| dct2

| 2-D discrete cosine transform

| dctmtx

| Discrete cosine transform matrix

| fan2para

| Convert fan-beam projections to parallel-beam

| fanbeam

| Fan-beam transform

| idct2

| 2-D inverse discrete cosine transform

| ifanbeam

| Inverse fan-beam transform

| iradon

| Inverse Radon transform

| para2fan

| Convert parallel-beam projections to fan-beam

| radon

| Radon transform

| fft2

| 2-D fast Fourier transform

| fftshift

| Shift zero-frequency component to center of spectrum

| ifft2

| 2-D inverse fast Fourier transform

| ifftshift

| Inverse FFT shift

3D Volumetric Image Processing

| imboxfilt3

| 3-D box filtering of 3-D images

| imgaussfilt3

| 3-D Gaussian filtering of 3-D images

| imgradient3

| Find 3-D gradient magnitude and direction of images

| imregdemons

| Estimate displacement field that aligns two 2-D or 3-D images

| integralBoxFilter3

| 3-D box filtering of 3-D integral images

| IntegralImage3

| Calculate 3-D integral image

| medfilt3

| 3-D median filtering

| superpixels3

| 3-D superpixel oversegmentation of 3-D image

| imref3d

| Reference 3-D image to world coordinates

| affine3d

| 3-D Affine Geometric Transformation

Code Generation

| adaptthresh

| Adaptive image threshold using local first-order statistics

| boundarymask

| Find region boundaries of segmentation

| bwareaopen

| Remove small objects from binary image

| bwboundaries

| Trace region boundaries in binary image

| bwconncomp

| Find connected components in binary image

| bwdist

| Distance transform of binary image

| bweuler

| Euler number of binary image

| bwlabel

| Label connected components in 2-D binary image

| bwlookup

| Nonlinear filtering using lookup tables

| bwmorph

| Morphological operations on binary images

| bwpack

| Pack binary image

| bwperim

| Find perimeter of objects in binary image

| bwselect

| Select objects in binary image

| bwtraceboundary

| Trace object in binary image

| bwunpack

| Unpack binary image

| conndef

| Create connectivity array

| demosaic

| Convert Bayer pattern encoded image to truecolor image

| edge

| Find edges in intensity image

| fitgeotrans

| Fit geometric transformation to control point pairs

| fspecial

| Create predefined 2-D filter

| getrangefromclass

| Default display range of image based on its class

| grayconnected

| Select contiguous image region with similar gray values

| histeq

| Enhance contrast using histogram equalization

| hough

| Hough transform

| houghlines

| Extract line segments based on Hough transform

| houghpeaks

| Identify peaks in Hough transform

| hsv2rgb

| Convert HSV colormap to RGB colormap

| im2double

| Convert image to double precision

| im2int16

| Convert image to 16-bit signed integers

| im2single

| Convert image to single precision

| im2uint16

| Convert image to 16-bit unsigned integers

| im2uint8

| Convert image to 8-bit unsigned integers

| imabsdiff

| Absolute difference of two images

| imadjust

| Adjust image intensity values or colormap

| imbinarize

| Binarize image by thresholding

| imbothat

| Bottom-hat filtering

| imboxfilt

| 2-D box filtering of images

| imclearborder

| Suppress light structures connected to image border

| imclose

| Morphologically close image

| imcomplement

| Complement image

| imcrop

| Crop image

| imdilate

| Dilate image

| imerode

| Erode image

| imextendedmax

| Extended-maxima transform

| imextendedmin

| Extended-minima transform

| imfill

| Fill image regions and holes

| imfilter

| N-D filtering of multidimensional images

| imfindcircles

| Find circles using circular Hough transform

| imgaborfilt

| Apply Gabor filter or set of filters to 2-D image

| imgaussfilt

| 2-D Gaussian filtering of images

| imgradient3

| Find 3-D gradient magnitude and direction of images

| imgradientxyz

| Find the directional gradients of a 3-D image

| imhist

| Histogram of image data

| imhmax

| H-maxima transform

| imhmin

| H-minima transform

| imlincomb

| Linear combination of images

| immse

| Mean-squared error

| imopen

| Morphologically open image

| imoverlay

| Burn binary mask into 2-D image

| impyramid

| Image pyramid reduction and expansion

| imquantize

| Quantize image using specified quantization levels and output values

| imread

| Read image from graphics file

| imreconstruct

| Morphological reconstruction

| imregionalmax

| Regional maxima

| imregionalmin

| Regional minima

| imresize

| Resize image

| imrotate

| Rotate image

| imtophat

| Top-hat filtering

| imtranslate

| Translate image

| imwarp

| Apply geometric transformation to image

| integralBoxFilter

| 2-D box filtering of integral images

| integralImage

| Calculate integral image

| intlut

| Convert integer values using lookup table

| iptcheckmap

| Check validity of colormap

| iptcheckconn

| Check validity of connectivity argument

| lab2rgb

| Convert CIE 1976 L*a*b* to RGB

| label2rgb

| Convert label matrix into RGB image

| label2idx

| Convert label matrix to cell array of linear indices

| mean2

| Average or mean of matrix elements

| medfilt2

| 2-D median filtering

| multithresh

| Multilevel image thresholds using Otsu's method

| ordfilt2

| 2-D order-statistic filtering

| otsuthresh

| Global histogram threshold using Otsu's method

| padarray

| Pad array

| psnr

| Peak Signal-to-Noise Ratio (PSNR)

| regionprops

| Measure properties of image regions

| rgb2gray

| Convert RGB image or colormap to grayscale

| rgb2hsv

| Convert RGB colormap to HSV colormap

| rgb2lab

| Convert RGB to CIE 1976 L*a*b*

| rgb2ycbcr

| Convert RGB color values to YCbCr color space

| stretchlim

| Find limits to contrast stretch image

| superpixels

| 2-D superpixel oversegmentation of images

| superpixels3

| 3-D superpixel oversegmentation of 3-D image

| watershed

| Watershed transform

| ycbcr2rgb

| Convert YCbCr color values to RGB color space

| imref2d

| Reference 2-D image to world coordinates

| imref3d

| Reference 3-D image to world coordinates

| affine2d

| 2-D Affine Geometric Transformation

| projective2d

| 2-D Projective Geometric Transformation

| strel

| Morphological structuring element

| offsetstrel

| Morphological offset structuring element

GPU Computing

{::nomarkdown} {:/}

| bwdist

| Distance transform of binary image

| bwlabel

| Label connected components in 2-D binary image

| bwlookup

| Nonlinear filtering using lookup tables

| bwmorph

| Morphological operations on binary images

| corr2

| 2-D correlation coefficient

| edge

| Find edges in intensity image

| histeq

| Enhance contrast using histogram equalization

| im2double

| Convert image to double precision

| im2single

| Convert image to single precision

| im2uint8

| Convert image to 8-bit unsigned integers

| im2uint16

| Convert image to 16-bit unsigned integers

| imabsdiff

| Absolute difference of two images

| imadjust

| Adjust image intensity values or colormap

| imbothat

| Bottom-hat filtering

| imclose

| Morphologically close image

| imcomplement

| Complement image

| imdilate

| Dilate image

| imerode

| Erode image

| imfill

| Fill image regions and holes

| imfilter

| N-D filtering of multidimensional images

| imgradient

| Gradient magnitude and direction of an image

| imgradientxy

| Directional gradients of an image

| imhist

| Histogram of image data

| imlincomb

| Linear combination of images

| imnoise

| Add noise to image

| ycbcr2rgb

| Convert YCbCr color values to RGB color space

| imopen

| Morphologically open image

| imreconstruct

| Morphological reconstruction

| imregdemons

| Estimate displacement field that aligns two 2-D or 3-D images

| imresize

| Resize image

| imrotate

| Rotate image

| imshow

| Display image

| imtophat

| Top-hat filtering

| iradon

| Inverse Radon transform

| mat2gray

| Convert matrix to grayscale image

| mean2

| Average or mean of matrix elements

| medfilt2

| 2-D median filtering

| normxcorr2

| Normalized 2-D cross-correlation

| padarray

| Pad array

| radon

| Radon transform

| regionprops

| Measure properties of image regions

| rgb2gray

| Convert RGB image or colormap to grayscale

| rgb2ycbcr

| Convert RGB color values to YCbCr color space

| std2

| Standard deviation of matrix elements

| stdfilt

| Local standard deviation of image

| stretchlim

| Find limits to contrast stretch image