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Boolean Combinations
Combining binary images using Boolean logic makes it possible to select structures or objects based on multiple criteria. For example, the thresholded binary images from the red, green and blue channels in the example do not by themselves select balloons of a single color. This interactive tutorial shows how combinations of binary images can accomplish this.
The tutorial initializes with a cartoon image of balloons of various colors appearing in the Specimen Image window. The Display Image buttons show either the original color image, or the thresholded Red, Green or Blue channels in the Specimen Image window. Adjacent to the Specimen Image window is the Boolean Combination window that shows the result of combining various color channels of the specimen image for the purpose of isolating some of the colored balloons. The Boolean Combination pull-down menu allows selection of various combinations of these channels.
When the Binary Image button is selected, the right hand image shows the resulting Boolean combination as a binary image with the selected pixels white and the background black, and the left hand image shows a binary representation of the thresholded red, green or blue channel (as selected). If the Masked Original button is selected, the right hand image shows the selected pixels with their original colors and the background as black, and the left hand image shows a the original colors for the pixels selected by thresholding the red, green or blue channel.
Contributing Authors
John C. Russ - Materials Science and Engineering Dept., North Carolina State University, Raleigh, North Carolina, 27695.
Matthew Parry-Hill, and Michael W. Davidson - National High Magnetic Field Laboratory, 1800 East Paul Dirac Dr., The Florida State University, Tallahassee, Florida, 32310.
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