Craic has released a new tool to help count features in images. This can be used in a range of applications such as counting buildings in satellite images, bacterial colonies and cell types in histology images.
It takes the form of a Ruby Sinatra application that fetches remote images and Javascript in the client web page that implements the marking and counting functions.
The user can choose the shape and color of the marker. The current total is updated as features are clicked and the coordinates of each point are stored internally.
The image with the user's marks can then be saved to a PNG format file and the list of coordinate pairs can be displayed in a separate window.
The graphics and interaction are implemented with Canvas and Javascript and make use of the wonderful Canvas2Image code from Jacob Seidelin which allows the current state of a canvas element to be saved to an image file.
The live application is hosted at Heroku and can be accessed at http://counter.craic.com
The code is distributed freely under the terms of the MIT license and is archived at Github
A collection of computer systems and programming tips that you may find useful.
Brought to you by Craic Computing LLC, a bioinformatics consulting company.
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