Ukasha, Ali Abdelrahman2017-11-272017-11-272010https://repository.sebhau.edu.ly/handle/1/161This study introduced new algorithm of a method known as Trapezoid method for the contour compression. The analysed algorithm is able to approximate efficiently a set of straight segments in a near optimal way in terms of contour quality. Representations of the input contour points are in Cartesian co-ordinates which are processed in such way to obtain vertices and which some of them are chosen as the vertices of the contour polygon. The analysed algorithm has some main advantage compared to the existing methods, it is faster on implementation. The proposed algorithm is compared with Ramer method because it has best quality among well known algorithms; and with Triangle method because it’s high speedity in implementation; in addition to the Trapezoid method (I algorithm) of contour approximation. Computational time of analysed method is estimated depending on a number of numerical operations. This paper shows that the simplicity is additional distinct feature of the proposed algorithm. This work gives an overview of the system architecture, describe the compression technique, and discuss implementation aspects. Experimental results for single and multicontours images are obtained in terms of image quality, compression ratios, and image retrieval timings. It was concluded that the proposed algorithm have high compression efficiency with accepted quality for different type of contours from different languages such as Arabic and English.enPolygonal approximation, contour representation, and contour compressionArticle