基于区域填充的二值数字图像放大算法

Algorithm for binary digital image magnifying based on area filling

二值数字图像是指仅由2种颜色组成的离散图像。采用一般方法放大二值数字图像,会导致图像的边缘出现模糊与锯齿现象,为此提出一种适合于放大二值数字图像的新算法;采用近邻取样法将图像放大到指定的倍数,通过搜索输入图像确定所有锯齿区域,将其映射到输出图像并进行区域填充;实验结果表明,该算法用于二值数字图像的放大能使图像边缘保持清晰与光滑,与其他方法相比具有明显的优势。

When a binary digital image, which includes only two kinds of color,is magnified with the existing methods, the object borders always look blurred and sawtooth, so a new method is proposed which is fit for the binary digital image. First, the neighbor-sampling method is adapted to magnify the image to the multiple appointed. Then, all the sawtooth areas in the input image are searched in turn and mapped onto the output image where the corresponding areas are filled up. The experiment results show that the new method can keep the borders in the output image smooth and sharp and is superior to the other techniques.