一种基于迭代阈值法的身份证图像二值化算法研究

Study of Binarization Method of Identification Card Scanned Image

针对身份证扫描图像受激光防伪阴影网格线影响较大的特点,对图像二值化的方法进行了深入分析和研究,提出了一种基于像素邻域特征的迭代阈值方法。该算法模型简单、易于实现,能滤除噪声、使字符笔划清晰地从背景中分割出来,获得了较好的二值化效果。

The identification card scanned image is seriously affected by laser restraining false shadow grid, several binarization methods of document image are studied according to this characteristic, an image binarization method is proposed , which is called iterative threshold methodbased on the neighborhood feature of the pixels . The arithmetic and the implementation is easy. The character strokes can segmented from the background distinctly, it has a good cancellation of the noise, consequentlya better effect of binariztion is aquired.