Browsing by Author "LOT, RC"

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GRAY-SCALE HOUGH TRANSFORM FOR THICK LINE DETECTION IN GRAY-SCALE IMAGES
(1995-05-01)
LOT, RC
;
TSAI, WH
;
資訊工程學系
;
Department of Computer Science
A new extension of the Hough transform, called gray-scale Hough transform (GSHT), is proposed for detecting thick lines (called bands) in a gray-scale image. The use of the conventional Hough transform (CHT) usually requires the preprocessing steps of thresholding and edge detection (or thinning) before the transform can be performed on a gray-scale image containing bands. This causes loss of useful gray and position relationship existing among the pixels of a band, and requires certain postprocessing steps to recover the band in the original image. The proposed GSHT with a gray-scale image as the direct input removes this shortcoming, requiring neither preprocessing nor postprocessing step in detecting bands in a gray-scale image. Experimental results, showing the feasibility of the proposed approach, are also included.