A Method Of Car Number Plate Extraction Using Two Kinds Of Modified Hough Transformations

Hyungjin Choi; Takeshi Agui; Masayuki Nakajima

doi:10.1117/12.976507

13 October 1987 A Method Of Car Number Plate Extraction Using Two Kinds Of Modified Hough Transformations

Hyungjin Choi, Takeshi Agui, Masayuki Nakajima

Proceedings Volume 0845, Visual Communications and Image Processing II; (1987) https://doi.org/10.1117/12.976507
Event: Cambridge Symposium on Optics in Medicine and Visual Image Processing, 1987, San Diego, CA, United States

Abstract

In this paper, we propose a method of extracting the regions of car number plates using two kinds of modified Hough transformations. One is a parameter restricted Hough transformation(PRH) and the other is a hierarchical parameter restricted Hough transformation(HPRH). The PRH algorithm, in which the range of the parameter plane is restricted, reduces the computation time and the storage capacity than the usual Hough transformation. The HPRH algorithm uses a hierarchical structure of image, and it also includes the PRH algorithm. The hierarchical structure reduces the picture points to be processed.

Citation Download Citation

Hyungjin Choi, Takeshi Agui, and Masayuki Nakajima "A Method Of Car Number Plate Extraction Using Two Kinds Of Modified Hough Transformations", Proc. SPIE 0845, Visual Communications and Image Processing II, (13 October 1987); https://doi.org/10.1117/12.976507

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