A digital watermarking algorithm in binary text image: Because of the weak information hiding immunity of binary text image, many watermarking methods based on gray or color images are useless.
改进的二值文本图像水印算法：由于二值图像信息隐藏免疫力差，绝大多数基于灰度或彩色图像的水印算法不再适用。
The image of point target in the imaging area is only several or dozens of pixels. And its strength is relatively weak and drowned in the noise, no obvious size, shape, texture, and other information.
点目标的成像面积仅为几个或几十个象素，目标强度相对较弱，无明显的尺寸、形状、纹理信息可供后续处理系统进行分析使用。
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