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PICO is an interactive editor for digitized graphic images. Editing operations are defined in a simple expression language based on the C language. The editor treats images as an ordered set of pixel structures stored in two-dimensional arrays. PICO checks editing commands for syntax, translates them into programs, optimizes and then executes them, all within a few seconds of run time. The command structure is similar to that of conventional multifile text editors with options for reading, writing, and transforming digitized images.
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Gerard J. Holzmann (1987) studied this question.
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