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Outline

For ease of experimentation, the application consists of two separate parts, one concerned with selection and display of samples from images, and the other concerned with the actual color perception and categorization model (Figure ).

The display program runs under X Windows, and allows one to display a 24-bit RGB image (a TrueColor Visual, in X lingo) acquired from, for instance, a camera and frame grabber, or a color scanner. It also allows one to select samples (blobs) of a certain pre-defined size (currently pixels) from the image using the mouse, which will be passed to the categorization program. It can subsample the entire image using the same blob size, and pass the result to the categorization program. Finally, it can draw boxes around blobs, whose center coordinates it gets from the categorization program.

The categorization program is a collection of Mathematica functions that can

• Name the (average) color of a blob pointed out on the image being displayed by the display program, and provide a goodness value.

• Point out examples of a named color category on the image, and provide a goodness value.

• Select one from a number of samples whose color best fits a given category, specified by name.