模糊边缘检测算法在水印模糊检测中的应用

在防伪印刷纸张质量检测系统中，纸张防伪水印的模糊是其检测的重要指标之一。为了保证实际防伪印刷纸张质量检测的实时性和准确性，提出了一种水印模糊检测算法，该算法运用一种改进的快速模糊边缘检测算法来进行水印图像的边缘轮廓检测，以得到目标图像的边缘轮廓，然后根据边缘轮廓的边缘信息，通过对边缘轮廓像素进行梯度运算得到边缘的灰阶变化，以边缘像素灰阶变化设计了水印模糊判定函数。经过实验，该算法运算速度较快，准确度较高，具有良好的应用前景。

Application of fuzzy edge detection to watermark blurring detection

The blurring of security watermark is one of the important indicators in the quality inspection system of security printing. In order to ensure the accuracy and the real-time property of quality inspection, an algorithm to measure the blurring of security watermark was proposed. First, a modified fast fuzzy edge detection algorithm was used to detect the contours of watermark images. Then the changes of marginal gray were obtained by calculating the gradients of marginal pixels. Finally an evaluation function to detect the quality of watermarks was designed. Experiments approve that the algorithm is faster and more accurate, and has a good application prospect.