The image package is part of the Octave Forge project. See its homepage for the latest release.

## Contents

## Development

Follows an incomplete list of stuff missing in the image package to be matlab compatible. Bugs are not listed here, search and report them on the bug tracker instead.

### Missing functions

- activecontour
- adapthisteq
- affine2d
- affine3d
- applycform
- bwconvhull
- bwdistgeodesic
- bwlookup
- bwtraceboundary
- bwulterode
- chromadapt
- colorcloud
- convmtx2
- corner
- cornermetric
- cpcorr
- cpselect
- cpstruct2pairs
- dct2
- dctmtx
- imbinarize
- deconvblind
- deconvlucy
- deconvreg
- deconvwnr
- decorrstretch
- demosaic
- dicomanon
- dicomdisp
- dicomuid
- dpxinfo
- dpxread
- fan2para
- fanbeam
- fliptform
- freqz2
- fsamp2
- ftrans2
- fwind1
- fwind2
- gabor
- getimage
- getimagemodel
- getline
- getpts
- getrect
- gradientweight
- grayconnected
- graycoprops
- graydiffweight
- hdrread
- hdrwrite
- iccfind
- iccread
- iccroot
- iccwrite
- idct2
- ifanbeam
- illumgray
- illumpca
- illumwhite
- im2java2d
- ImageAdapter
- imageinfo
- imapplymatrix
- imapprox
- imbinarize
- imboxfilt
- imboxfilt3
- imcolormaptool
- imcontour
- imcontrast
- imdisplayrange
- imdistline
- imellipse
- imfreehand
- imfuse
- imgaborfilt
- imgaussfilt
- imgaussfilt3
- imgca
- imgcf
- imguidedfilter
- imhandles
- imhistmatch
- imline
- immagbox
- immovie
- imoverview
- imoverviewpanel
- impixelinfo
- impixelinfoval
- impixelregion
- impixelregionpanel
- implay
- impoint
- impoly
- improfile
- imrect
- imref2d
- imref3d
- imregconfig
- imregcorr
- imregdemons
- imregister
- imregtform
- imroi
- imscrollpanel
- imsegfmm
- imseggeodesic
- imshowpair
- imtool
- imwarp
- integralBoxFilter
- integralBoxFilter3
- integralImage
- integralImage3
- interfileinfo
- interfileread
- iptaddcallback
- iptcheckhandle
- iptgetapi
- iptGetPointerBehavior
- iptgetpref
- ipticondir
- iptPointerManager
- iptprefs
- iptremovecallback
- iptSetPointerBehavior
- iptsetpref
- iptwindowalign
- isicc
- isrset
- lin2rgb
- makecform
- makeConstrainToRectFcn
- makehdr
- makeresampler
- multithresh
- nitfinfo
- nitfread
- openrset
- para2fan
- projective2d
- regionfill
- rgb2lin
- roifill
- roifilt2
- roipoly
- rsetwrite
- ssim
- tformarray
- tonemap
- truesize
- visboundaries
- warp
- whitepoint
- xyz2double
- xyz2uint16

### Different functions

- with version 2014a, Matlab introduced a new function imtranslate. This function was part of Octave's package since 2002 but Matlab version is completely different. It needs to be rewritten for Matlab compatibility.

### Missing options

- @strel
- missing SE decomposition for the diamond shape
- approximation argument for the ball and disk shapes are not implemented
- the translate method is not yet implemented

- blockproc
- The name-value input arguments have not yet been implemented.

- colfilt
- the option to split the image in smaller blocks before performing the im2col and filtering is ignored. Since that option only allows to use less memory and has no effect on the output is only important for sliding filtering with big blocks size.

- impixel
- interactive selection of points (less than 2 input arguments) is not yet implemented. Ability to create such UIs needs to be implemented in Octave core first.

- imcrop
- messing around with alternative coordinate systems (XData and YData) are not yet implemented.

- imwrap
- no supports for SmoothEdges option

- hough
- no RhoResolution option

### Contributing

- It'd help to group the missing functions above, as per [1] (similar to what was done in the signal package wiki page); please keep the original alphabetical list intact.

### Open Bugs

bug | bug title | status |
---|---|---|

#38087 | image package: graycomatrix incompatibilities with matlab | None |

#41674 | image package: temporary arrays in imresize are doubles | None |

#43218 | image package: imshear causes more signal spread than expected and inconsistent vertical offset | None |

#44396 | image package: bwmorph shrink does not preserve Euler number | Confirmed |

#44799 | image package: imrotate chrashes when using 'spline' as interpolation method | Confirmed |

#44831 | image package: imrotate - different dimensions of output matrix | Confirmed |

#45088 | image package: rangefilt requires domain and image to have equal number of dimensions | In Progress |

#46745 | image package: imresize default method (bicubic) Matlab incompatible for the border pixels | None |

#48529 | image package: compilation warnings under Mac OSX | None |

#50151 | image package: normxcorr2 is not compatible with Matlab | None |

#50188 | image package: poly2mask does incompatible rounding | None |

#50257 | image package: imtranslate is not Matlab compatible | Confirmed |

#50341 | Missing Function imrect in image package | None |

#50429 | image package: xyz2lab changed slightly in Matlab (and other color conversion functions) | None |

#50656 | image package: bwerode does not return right size when there's more dimensions on conn | None |

#50708 | image package: add demosaic.m | Patch Submitted |

#50732 | Image package: infinite error loop when assigning a strel (class) object to a vector | Confirmed |

#51420 | [octave forge] (image) imrotate is less tolerant to missing argument than Matlab | None |

#51719 | [octave forge] (image) watershed unit test failure | None |

#51769 | [octave forge] (image) imresize bilinear interpolation inaccurate | Patch Submitted |

#51884 | [octave forge] (image) bwmorph(blackNwhiteMatrix, "thicken", 1) returns negated result (+ strange behavior at border) | None |

#51979 | [octave forge] (image) Failing unit test for impyramid | None |

#51980 | [octave forge] (image) Failing unit test for edge | None |

#52006 | [octave forge] (image) 'makecform' feature request | Confirmed |

#52119 | [octave forge] (image) Add 'reflect' padding option to imfilter | None |

#52715 | [octave forge] (image) Add full data range option to ycbcrfunc conversions | None |

#52959 | [octave forge] (image) histeq is not compatible with Matlab | None |

#55059 | [octave forge] (image) Failing unit test for grayslice | In Progress |

#55202 | [octave forge] (image) imresize fails for method nearest and image of 1 row | Confirmed |

### Patches

- #8059: [new function for image package] ranktf.m
- #8060: [image package new function] whitepoint.m
- #8722: implement impixelinfo and impixelinfoval
- #8813: image package: Extended image I/O for Analyze 7.5 format to handle big-endian images
- #8866: image package: add metainfo.xml file for Gnome Software
- #8571: image package: three deconvolution routines (Wiener, RL, RLTV)
- #8824: added affine2d class
- #9509: Image package: simple implementation of roipoly function
- #9593: [Octave Forge] (Image) New function demosaic.m from bug #50708
- #9600: [Octave Forge] (Image) New functions: lin2rgb.m and lrgb2lin.m
- #9602: [octave forge] (image) multithresh
- #9603: [Octave Forge] (Image) New functions: xyz2double.m, xyz2single.m, xyz2uint16.m
- #9606: [Octave forge] (image) New function integralImage
- #9717: [octave forge] (image) new function imapplymatrix
- #9722: [octave forge] (image) new objects imref2d and imref3d
- #9729: [octave forge] (image) -- rgb2xyz conversion with adapted whitepoint
- #9730: [octave forge] (image) new function imfuse

## Image Processing Functions

This is a list of Image Processing functions by topic including: missing functions, related bugs and patches, and some alternatives.

Note:

### Basic Read and Write Image Files

Function | Octave Package Version | Related Bugs and Patches | Alternatives | Notes |
---|---|---|---|---|

imfinfo | function is in Octave core | |||

imread | function is in Octave core | cv.imread from mexopencv |
in case of color image, the color order of Octave is RGB/RGBA while OpenCV color order is BGR/BGRA | |

imwrite | function is in Octave core | cv.imwrite from mexopencv |
in case of color image, the color order of Octave is RGB/RGBA while OpenCV color order is BGR/BGRA |

**Missing:** *dicomanon, dicomdisp, dicomuid, dpxinfo, dpxread, interfileinfo, interfileread, nitfinfo, nitfread*

### High Dynamic Range Images - *Not implemented*

### Large Image Files - *Not implemented*

### Type Conversion

Function | Octave Package Version | Related Bugs and Patches | Alternatives | Notes |
---|---|---|---|---|

adaptthresh | - | cv.adaptiveThreshold from mexopencv | ||

demosaic | - | #50708 #9593 | cv.demosaicing from mexopencv | |

gray2ind | function is in Octave core | |||

grayslice | < 1.0.0 | |||

graythresh | 1.0.0 | Octave version has more methods | ||

im2double | 1.0.0 | |||

im2int16 | 2.0.0 | |||

im2java2d | - | |||

im2single | 2.0.0 | |||

im2uint16 | 1.0.0 | |||

im2uint8 | 1.0.0 | |||

imbinarize | - | imbinarize (I) is equivalent to im2bw(I, graythresh(I)),
another option is cv.threshold from mexopencv |
||

imcast | 2.4.0 | Octave Only | ||

imquantize | 2.6.0 | |||

ind2gray | function is in Octave core | |||

ind2rgb | function is in Octave core | |||

label2rgb | 1.0.0 | |||

mat2gray | < 1.0.0 | |||

multithresh | - | #9602 | ||

otsuthresh | - | #9360 | graythresh | otsuthresh(hist) is equivalent to graythresh (hist) |

rgb2gray | function is in Octave core | #53654 | Octave version 4.4.0 and above | |

rgb2ind | function is in Octave core |

### Color

Function | Octave Package Version | Related Bugs and Patches | Alternatives | Notes |
---|---|---|---|---|

colorangle | 2.10.0 (unreleased) | |||

lab2double | 2.6.0 | |||

lab2rgb | 2.6.0 | |||

lab2uint16 | 2.6.0 | |||

lab2uint8 | 2.6.0 | |||

lab2xyz | 2.6.0 | |||

lin2rgb | - | #9600 | ||

ntsc2rgb | 2.8.0 | |||

rgb2lab | 2.6.0 | |||

rgb2lin | - | #9600 | ||

rgb2ntsc | 2.8.0 | |||

rgb2xyz | 2.6.0 | |||

rgb2ycbcr | < 1.0.0 | |||

whitepoint | - | #8060 | ||

xyz2double | - | #9603 | ||

xyz2lab | 2.6.0 | |||

xyz2rgb | 2.6.0 | |||

xyz2uint16 | - | #9603 | ||

ycbcr2rgb | 2.2.0 |

**Missing:** *applycform, chromadapt, colorcloud, iccfind, iccread, iccroot, iccwrite, illumgray, illumpca, illumwhite, imapprox, isicc, makecform*

### Synthetic Images

Function | Octave Package Version | Related Bugs and Patches | Alternatives | Notes |
---|---|---|---|---|

checkerboard | 2.2.0 | |||

imnoise | 2.2.2 | |||

phantom | 2.6.2 |

### Basic Display

Function | Octave Package Version | Related Bugs and Patches | Alternatives | Notes |
---|---|---|---|---|

imshow | function is in Octave core | |||

montage | - |

**Missing:** *imfuse, immovie, implay, imshowpair, iptgetpref, iptprefs, iptsetpref, warp*

### Image Filtering

Function | Octave Package Version | Related Bugs and Patches | Alternatives | Notes |
---|---|---|---|---|

bwareafilt | 2.4.0 | |||

bwpropfilt | 2.4.0 | |||

convmtx2 | - | |||

entropyfilt | 1.0.9 | |||

fibermetric | - | |||

freqz2 | - | |||

fsamp2 | - | |||

fspecial | 1.0.0 | |||

ftrans2 | - | |||

fwind1 | - | |||

fwind2 | - | |||

gabor | - | |||

imboxfilt | - | |||

imboxfilt3 | - | |||

imfilter | 1.0.5 | |||

imgaborfilt | - | |||

imgaussfilt | - | |||

imgaussfilt3 | - | |||

imguidedfilter | - | |||

imsmooth | 1.0.5 | Octave only | ||

integralBoxFilter | - | |||

integralBoxFilter3 | - | |||

integralImage | - | #9606 | cv.integral from mexopencv | |

integralImage3 | - | |||

medfilt2 | < 1.0.0 | |||

medfilt3 | - | |||

nlfilter | < 1.0.0 | |||

normxcorr2 | 2.0.0 | #50151 | ||

ordfilt2 | 1.0.9 | |||

padarray | < 1.0.0 | |||

rangefilt | 1.0.9 | #45088 | ||

stdfilt | 1.0.9 | |||

wiener2 | 2.8.0 |

### Image Arithmetic

Function | Octave Package Version | Related Bugs and Patches | Alternatives | Notes |
---|---|---|---|---|

imabsdiff | 2.0.0 | |||

imadd | 2.0.0 | |||

imapplymatrix | - | #9717 | ||

imcomplement | 1.0.6 | |||

imdivide | 2.0.0 | |||

imlincomb | 2.0.0 | |||

immultiply | 2.0.0 | |||

imsubtract | 2.0.0 |

### Morphological Operations

Function | Octave Package Version | Related Bugs and Patches | Alternatives | Notes |
---|---|---|---|---|

applylut | < 1.0.0 | |||

bwareaopen | 2.2.0 | |||

bwhitmiss | < 1.0.0 | |||

bwlookup | -- | |||

bwmorph | < 1.0.0 | #51884 | ||

bwulterode | -- | |||

conndef | < 1.0.0 | |||

imbothat | 2.0.0 | |||

imclearborder | 2.4.0 | |||

imclose | < 1.0.0 | |||

imdilate | < 1.0.0 | |||

imerode | < 1.0.0 | |||

imextendedmax | 2.8.0 | |||

imextendedmin | 2.8.0 | |||

imfill | 2.6.0 | |||

imhmax | 2.8.0 | |||

imhmin | 2.8.0 | |||

imimposemin | 2.8.0 | |||

imopen | < 1.0.0 | |||

imreconstruct | 2.4.0 | |||

imregionalmax | 2.4.0 | |||

imregionalmin | 2.4.0 | |||

imtophat | < 1.0.0 | |||

iptcheckconn | 2.0.0 | |||

offsetstrel | -- | |||

strel | 2.2.0 | #50732 | ||

watershed | 2.6.0 |

### Image Transforms

Function | Octave Package Version | Related Bugs and Patches | Alternatives | Notes |
---|---|---|---|---|

dct2 | ||||

dctmtx | ||||

fanbeam | ||||

fan2para | ||||

fftshift | ||||

fft2 | ||||

hough | ||||

houghlines | ||||

houghpeaks | ||||

idct2 | ||||

ifftshift | ||||

ifft2 | ||||

iradon | ||||

para2fan | ||||

radon |

### Graphical Interface Interaction

Function | Octave Package Version | Related Bugs and Patches | Alternatives | Notes |
---|---|---|---|---|

imellipse | - | |||

imfreehand | - | |||

imline | - | |||

immagbox | - | |||

imoverview | - | |||

imoverviewpanel | - | |||

impixelinfo | - | #8722 | ||

impixelinfoval | - | #8722 | ||

impixelregion | - | |||

impixelregionpanel | - | |||

implay | - | |||

impoint | - | |||

impoly | - | |||

imrect | - | |||

imscrollpanel | - | |||

iptgetpref | - | |||

iptprefs | - | |||

iptsetpref | - |

- Obs: implay, iptgetpref, iptprefs, iptsetpref functions are on Basic Display section too...