Image package

The image package is part of the octave-forge project. See its homepage for the latest release.

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.

Roadmap

The following are missing targets for the next minor release of the image package (version 2.8.0). Small bug fixes, build fixes, and regressions may still be released before in a patch release (Version 2.6.X).

• add ellipse properties to regionprops (see bug #44100) (done)
• speed up regionprops for large images with many small objects (probably work around for loop with labeled == labelid)
• support passing bwconncomp output to regionprops (and then fix bwpropfilt to use that instead of a labeled image)
• ND support on imfilter
• check if normxcorr2 is Matlab compatible and investigate making use of fftconvn since it's likely to receive large input
• investigate implementing the missing deconvolution functions (see patch #8571)
• anything else that is done or submitted before the above are done

Missing functions

this entire section is about the current development version. If a Matlab function is missing from the list and does not appear on the current release of the package, confirm that is also missing in the development sources before adding it.

• activecontour
• adapthisteq
• affine2d
• affine3d
• applycform
• axes2pix
• bwconvhull
• bwdistgeodesic
• bwlookup
• bwpack
• bwtraceboundary
• bwulterode
• bwunpack
• convmtx2
• corner
• cornermetric
• cpcorr
• cpselect
• cpstruct2pairs
• dct2
• dctmtx
• deconvblind
• deconvlucy
• deconvreg
• deconvwnr
• decorrstretch
• demosaic
• dicomanon
• dicomdisp
• dicomuid
• dpxread
• dpxinfo
• fan2para
• fanbeam
• fliptform
• freqz2
• fsamp2
• ftrans2
• fwind1
• fwind2
• gabor
• getimage
• getimagemodel
• getline
• getpts
• getrect
• gradientweight
• graycoprops
• grayconnected
• graydiffweight
• hdrread
• hdrwrite
• houghlines -- (see hough_line)
• houghpeaks
• iccfind
• iccread
• iccroot
• iccwrite
• idct2
• ifanbeam
• im2java2d
• ImageAdapter
• imageinfo
• imapplymatrix
• imapprox
• imbinarize
• imboxfilt
• imboxfilt3
• imcolormaptool
• imcontour
• imcontrast
• imdisplayrange
• imdistline
• imellipse
• imextendedmax
• imextendedmin
• imfindcircles
• imfreehand
• imfuse
• imgaborfilt
• imgaussfilt
• imgaussfilt3
• imgca
• imgcf
• imguidedfilter
• imhandles
• imhistmatch
• imhmax
• imhmin
• imimposemin
• imline
• immagbox
• immovie
• imoverview
• imoverviewpanel
• impixelinfo
• impixelinfoval
• impixelregionpanel
• impixelregion
• 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
• makecform
• makeConstrainToRectFcn
• makehdr
• makeresampler
• multithresh
• nitfinfo
• nitfread
• openrset
• otsuthresh
• para2fan
• projective2d
• regionfill
• roifill
• roifilt2
• roipoly
• rsetwrite
• ssim
• tformarray
• tonemap
• truesize
• visboundaries
• viscircles
• warp
• whitepoint
• wiener2
• 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
#38085	image package: fails to build with --enable-64 (entropyfilt)	Confirmed
#38087	image package: graycomatrix incompatibilities with matlab	None
#38345	image package: __spatial_filtering__() always returns class double	Confirmed
#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	Patch Reviewed
#46745	image package: imresize default method (bicubic) Matlab incompatible for the border pixels	None
#48529	image package: compilation warnings under Mac OSX	None
#50071	OF image: bwfill(...,4) in Octave behaves like bwfill(...,8) in MATLAB and vice versa	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
#50783	image package: imlincomb is not compatible with Matlab	none
#50874	bwdist call causes application crash	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
• #9235: image package: improve filtering functions (stdfilt, entropyfilt) and add tests (also medfilt2, ordfilt2, rangefilt)
• #9244: image package: regionprops.m - new properties ConvexHull, ConvexImage, ConvexArea, Solidity

Image Processing Functions (this section is under construction)

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

Note: This section is under construction so this list is still incomplete

Basic Read and Write Image Files

Function	Octave Package Version	Related Bugs and Patches	Alternatives	Notes
imfinfo	2.6.1
imread	2.6.1		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	2.6.1		cv.imwrite from mexopencv	in case of color image, the color order of Octave is RGB/RGBA while OpenCV color order is BGR/BGRA

Type Conversion

Function	Octave Package Version	Related Bugs and Patches	Alternatives	Notes
adaptthresh	-		cv.adaptiveThreshold from mexopencv
demosaic	-	#50708	cv.demosaicing from mexopencv
gray2ind	2.6.1
grayslice	2.6.1
graythresh	2.6.1			Octave version has more methods
im2double	2.6.1
im2int16	2.6.1
im2java2d	-
im2single	2.6.1
im2uint16	2.6.1
im2uint8	2.6.1
imbinarize	-		imbinarize (I) is equivalent to im2bw(I, graythresh(I)), another option is cv.threshold from mexopencv ||
imcast	2.6.1			Octave Only
imquantize	2.6.1
ind2gray	2.6.1
ind2rgb	2.6.1
label2rgb	2.6.1
mat2gray	2.6.1
multithresh	-
otsuthresh	-		graythresh	otsuthresh(hist) is equivalent to graythresh (hist)
rgb2gray	2.6.1
rgb2ind	2.6.1

Image Filtering

Function	Octave Package Version	Related Bugs and Patches	Alternatives	Notes
bwareafilt	2.6.1
bwpropfilt	2.6.1
convmtx2	-
entropyfilt	2.6.1
fibermetric	-
freqz2	-
fsamp2	-
fspecial	2.6.1
ftrans2	-
fwind1	-
fwind2	-
gabor	-
imboxfilt	-
imboxfilt3	-
imfilter	2.6.1
imgaborfilt	-
imgaussfilt	-
imgaussfilt3	-
imguidedfilter	-
imsmooth	2.6.1			Octave only
integralBoxFilter	-
integralBoxFilter3	-
integralImage	-
integralImage3	-
medfilt2	2.6.1	#9235
medfilt3	-
nlfilter	2.6.1
normxcorr2	2.6.1	#50151
ordfilt2	2.6.1	#9235
padarray	2.6.1
rangefilt	2.6.1	#45088 #9235
stdfilt	2.6.1	#9235
wiener2	-