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Fast algorithms to detect lines and rectangles in grey-scale images are proposed. At first, a contour image is obtained by the modified edge detection scheme. The linear primitives are extracted in the contour image and joined into line segments by cluster analysis method. The line merging algorithm is developed to get straight lines from segments. Algorithm to detect rectangles from the extracted...
A method for extraction of straight-line-based primitives is proposed. It is based on a bottom-up approach that extracts linear primitives first, then line segments, that are grouped in straight lines. Based on the extracted lines, quadrangles are detected and further approximated by rectangles. The extracted primitives are used in object recognition. The proposed approach provides a good relation...
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