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ITK includes a number of iterators including the {em itkImageLinearConstIteratorWithIndex} and {em
itkImageLinearIteratorWithIndex} that support visiting voxels along
lines parallel to the image axes. This is particularly useful for
separable filters. This [...]
Tiff images are widely used and domain and instrument specific
information is often included in some tags. There isn't any standard
way of making use of this information in ITK at present. This article
introduces some minor additions to the ITK tiff reader to [...]
It is sometimes useful to apply a filter to a region defined by a
mask. This article introduces a simple ``mask adaptor'' filter that
allows this type of operation to be tested easily. It is applicable to filters that do not need any pixel location [...]
It is often useful to be able to compute the component of image gradient in a direction defined by a shape of some form, rather than relative to the image axis. This article introduces a simple method for doing this based on distance transforms that is [...]
Logic operations such as $I > J$, where I and J are images are useful
when generating masks. This submission includes $==$, $>$, $>=$, $<$
and $<=$ filters based on the existing logic filters. This is a very
minor submission - there may already be easy [...]
Morphological area attribute openings and closingscite{Cheng92,Vincent93a} are connected set
operations that are able to remove parts of an image that meet certain
criteria without changing the rest of the image. This article describes a number of
classes [...]
Morphological erosion and dilation filters employ a structuring function, with flat structuring functions being the most common example. This article will use the term ``parabolic'', but much of the literature uses ``quadratic'' structuring functions are less [...]
Morphological reconstruction may be implemented in a number of
different ways. ITK has an iterative method and a non iterative
method. This article compares the performance of another non iterative
method and finds a significant improvement.
The report details some modifications made to the ITK
{em ConnectedComponentImageFilter} in an attempt to improve
performance. Some interesting observations were made during this
process. A new filter using a different algorithm to perform the [...]
Using intensity histograms to estimate image thresholds is a long established practice in image processing and image analysis and a wide variety of techniques have been developed. Different techniques are appropriate for different intensity distributions. [...]
Grayscale dilation and erosion are basic transformations of mathematical morphology. Used together
or with other transformations, they are very useful tools for image analysis. However, they can be very
time consuming, especially with 3D images, and with [...]
It is sometimes useful to be able to apply binary morphological operations, such as erosions and dilations, to labelled images in a fashion that preserves the labels. This article introduces a specialised class implementing parallel methods described in beare [...]
Facet Analyser: ParaView plugin for automated facet detection and measurement of interplanar angles of tomographic objects
Published in The MIDAS Journal
Published in The MIDAS Journal
The presented ParaView plugin allows easy access to the algorithm described in Ref 1. It enables analysis of faceted objects that exhibit distortions in their digital representation, e.g. due to tomographic reconstruction artifacts.
The contributed [...]
This report discusses various definitions and implementations of the watershed transform as well as providing an introduction to some well known techniques for applying the watershed transform to practical problems. The discussion will be focused on new and [...]
Finding regional extrema of images is an important step in a number of
morphological algorithms, such as some versions of the watershed
transformfootnote{This work started because we were trying to compare
different watershed algorithms}. Regional extrema [...]
Kernel based filtering is one of the fundamental tools of image
analysis and processing. A number of approaches have been developed
over the years that allow efficient implementation of such filters
even when the kernel size is large. This article reviews [...]
There is great interest in the use of graphics processing units (GPU)for general purpose applications because the highly parallel architectures used in GPUs offer the potential for huge performance increases. The use of GPUs in image analysis applications has [...]
