边缘检测算子在提取图像金色区域中的应用

Application of Several Edge Detection Operator in Golden Area Extraction

为了提取图像中适合金墨印刷的金色区域,对边缘检测的方法进行了深入探讨,运用各种边缘检测算子分割图像。利用MATLAB对Roberts算子、Sobel算子、Prewitt算子、Log算子、Canny算子进行实验验证和分析。结果表明,边缘检测的方法基本上可以实现边缘轮廓的闭合,简单图像能产生连续的闭合轮廓,相比复杂图像效果要好,特别是对于那些背景不是太复杂的图像,图像分割的效果比较理想。分析比较几种算子,运用Canny算子进行边缘检测分割效果较好。

In order to extract the gold region for metallic ink printing, the paper utilizes many kinds of operators to carry the image edge detection. Several common edge detection operators （Roberts operator, Prewitt operator, Sobel operator, Log operator and Canny operator） in digital processing can be loaded from MATLAB＇s function library. The experiments were carried out on various images with different textures and background contents, and the segmentation effect compared and analyzed. The experiments showed that the edge detection algorithm could form closed contour, which from the simple images is better than that from the complex images. Es- pecially, for the uniform or flat background, the image segmentation effect is better. Analysis and comparison of the several operators indicates that Canny operator is the best for edge detection.