Abstract: In computer-aided design systems, the most critical step when analyzing the geometric structure of a part from a two-dimensional raster drawing is to extract the contour lines of the part.

contour drawing - shows outlines, shapes and edges but not fine detail, texture, tone or colour cross contour drawing - uses lines drawn across surfaces to suggest their depth and form tonal study - ...

Abstract: In this paper, we propose a counting system based on contour extraction and recognition for identifying ships at sea, by controlling the range of pixel values of the gray scale image in ...

Assuming that children make drawings as artists do, by selecting drawing systems appropriate to their intention from a repertoire, this study asked what systems for contour and form children from ...