Version 2.2.2 (R12) Image Processing Toolbox

This table summarizes what's new in Version 2.2.2 (R12).

New Features and Changes	Version Compatibility Considerations	Fixed Bugs and Known Problems
Yes Details below	No	Fixed bugs Details

New features and changes introduced in this version are:

• New Demo

• Support For Function Handles

• Documentation Enhanced

• Major Bug Fixes

New Demo

The Image Processing Toolbox 2.2.2 includes the new landsatdemo function, which is a demo that illustrates how to construct color composite images from multispectral Landsat data.

Support For Function Handles

The following functions have been updated to support function handles, a new MATLAB 6.0 language feature:

• blkproc

• colfilt

• nlfilter

• qtdecomp

• roifilt2

The MATLAB language has a new data type called the function handle. The function handle captures all the information about a function that MATLAB needs to evaluate it. You can pass a function handle in an argument list to other functions.

Documentation Enhanced

The online documentation was enhanced for Release 12 by adding a "Getting Started" section, and by adding glossaries of relevant terms at the beginning of several chapters.

Major Bug Fixes

imshow Fixes

You can now display the same image twice using imshow, without the previous problem of having the images appear to move slightly the second time.

Also, you can now use the syntax imshow(I,[]) when all the elements of I are the same. Now imshow displays I using an intermediate shade of gray. Previously, imshow would generate an error for this case. (This fix was introduced in the Image Processing Toolbox 2.2.1 (Release 11.1).)

bwlabel Segmentation Violation Eliminated

You can now pass a matrix to bwlabel that contains values other than 0 or 1. bwlabel treats any nonzero element as an object element. Previously, bwlabel would cause a segmentation violation for this case. (This fix was introduced in the Image Processing Toolbox 2.2.1 (Release 11.1).)

dilate and erode Return Correct Answers

The dilate and erode functions now return the correct answer in all cases. In prior versions of the Image Processing Toolbox, in some cases these functions returned the incorrect answer if you specified the frequency-domain option with a structuring element that contained more than 255 elements.

freqz2 Fixes

The freqz2 function now returns correct values for the frequency scaling. Also, freqz2 no longer uses an excessive amount of memory.

fspecial Function's Log Option

The Log option of the fspecial function now returns correctly scaled values.

Improved Display for imcrop, improfile, and roipoly

The animated lines that the imcrop, improfile, and roipoly functions display on top of images are now displayed clearly.

Version 3.0 (R12+) Image Processing Toolbox

Compatibility Summary for Image Processing Toolbox

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