semi-space

Two-dimensional surfaces {pre-space} {semi-space} can add relative distance information to represent three-dimensional spaces. Semi-spaces are like two-and-a-half-dimension sketches [Marr, 1982].

Sense, and computer, processing uses intensity variations to find symbolic primitives, such as zero crossings, edges, contours, and blobs; detect boundaries and brightnesses; and represent two dimensions. From the primitives, sense and computer processing finds relative surface distances, depths, contours, and orientations and uses surface shading, orientation, scaling, and texture to find object and observer spatial relations, to simulate three dimensions. Later, sense and computer processing uses memory and global information to integrate the two-dimensional and depths-and-distances descriptions to build a three-dimensional model for object representation, manipulation, and recognition.

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