This invention discloses image analysis techniques supporting the interpretation of marks (Figs 6, 7) on a large drawing board (52) for purposes of controlling a Board transcription device (56). In order for users to control such a transcription device (56) by writing on the Board (52) itself, the system recognizes certain markings (Figs 6, 7) and directives drawn by users (51) in accordance with an agreed-upon format for control diagrams conveying information as to the parameters of transcription. In the embodiment herein described, nested squares (152, 154; Fig. 3), spatial region indicators, and symbolic annotation analysis area used to convey command parameters. The present invention demonstrates line drawing analysis techniques that support grouping and manipulation of symbolic tokens in a Scale-Space blackboard data structure.
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