Download ImageJ:

To download imageJ first go to the http://rsbweb.nih.gov/ij/
the page will open

click download
http://rsbweb.nih.gov/ij/download.html
then get latest version of imageJ for your OS . If you are new to use ImageJ then Download ImageJ 1.43 bundled with 32-bit Java 1.6.0_10 (25MB) other wise download without java for windows OS.

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Medical Image Processing tool:

ImageJ:
ImageJ is a public domain, Java-based image processing program developed at the National Institutes of Health. ImageJ was designed with an open architecture that provides extensibility via Java plugins and recordable macros. Custom acquisition, analysis and processing plugins can be developed using ImageJ's built-in editor and a Java compiler. User-written plugins make it possible to solve many image processing and analysis problems, from three-dimensional live-cell imaging, to radiological image processing,multiple imaging system data comparisonsto automated hematology systems.ImageJ's plugin architecture and built in development environment has made it a popular platform for teaching image processing.

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peptide bond:

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Amino Acids:

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Dancing protein:

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protein structure:

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primary structure analysis:

Tool:
Radar:De novo repeat detection in protein sequences 
 I entered the protein albumin in uniprot and get the following result It gave the number of repeats present in  the sequence.
http://www.ebi.ac.uk/Tools/es/cgi-bin/jobresults.cgi/radar/radar-20101102-1505421645.html

 

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