Image Processing Toolbox Release Notes

Chapter 5
Image Processing Toolbox 3.2 Release Notes

New Features

This section introduces the new features and enhancements added in the Image Processing Toolbox 3.2 since Version 3.1 (Release 12.1).

The new features introduced in the Image Processing Toolbox, Version 3.2, include:

More error checking of input images, specifically input classes, attributes and option string processing, with clearer error messages
Support for writing DICOM files
Changes to how binary images are represented. (Support for the new MATLAB logical data type.)
Enhancements to several existing functions

If you are upgrading from a release earlier than Release 12.1, then you should also see New Features.

Writing DICOM Files

The Image Processing Toolbox now supports writing files in Digital Imaging and Communications in Medicine (DICOM) format, using the dicomwrite function. Previous releases of the toolbox supported reading DICOM files with the dicomread function and reading metadata from a DICOM file using the dicominfo function.

Representing Binary Images

In previous releases, toolbox functions that returned binary images returned them as uint8 logical arrays. The toolbox used the presense of the logical flag to signify that the data range in the file was [0,1].

With this release, the toolbox returns binary images as logical arrays, using the new MATLAB logical data type. For more information about the new logical class, see the MATLAB 6.5 Release Notes.

Changes to Existing Functions

The Image Processing Toolbox, Version 3.2, includes changes to these existing functions.

Function
Description of Change

circshift
Moved into MATLAB

freqz2
Checks for insignificant real part in addition to insignificant imaginary part

getnhood
Returns a logical array

gray2ind
More efficient memory usage

imfill
New syntax for grayscale images does not require 'holes' argument. This option is selected automatically.

imlincomb
Accepts more than two images as input and you can specify the output class

immovie
Flicker during movie creation eliminated

imtransform
Linear and bicubic interpolation are faster

ordfilt2
Uses a different algorithm for binary images that improves processing speed for these images

roifilt2
More efficient. Operation is performed only on the region of interest, not the entire image.

Function	Description of Change
`circshift`	Moved into MATLAB
`freqz2`	Checks for insignificant real part in addition to insignificant imaginary part
`getnhood`	Returns a logical array
`gray2ind`	More efficient memory usage
`imfill`	New syntax for grayscale images does not require `'holes'` argument. This option is selected automatically.
`imlincomb`	Accepts more than two images as input and you can specify the output class
`immovie`	Flicker during movie creation eliminated
`imtransform`	Linear and bicubic interpolation are faster
`ordfilt2`	Uses a different algorithm for binary images that improves processing speed for these images
`roifilt2`	More efficient. Operation is performed only on the region of interest, not the entire image.

Major Bug Fixes Major Bug Fixes

Chapter 5Image Processing Toolbox 3.2 Release Notes

Chapter 5
Image Processing Toolbox 3.2 Release Notes