A new double sreganography algorithm based on the boundary pixels of binary images and direction codes was proposed. The secret message of embedded carrier data could be divided into two parts:a set of rules was used in the first part to check boundary pixels in the bit planes for data embedding eligibites. Ensuring correct extraction of the secret data from the stego-image without any other additional information; the second part was carried by the weighted sum of carrier data. The algorithm addressed shows the good performance of simple implementation, large information capacity and high resolution picture.%基于二值图像边缘像素和方向编码,提出一种以灰度图像为载体的双层隐写方法.嵌入栽体数据的秘密信息分为两部分:第一部分利用二值图像边缘像素嵌入信息,利用一组完备的规则,能够准确判断边缘像素是否可以承栽嵌入数据,保证嵌入数据的无差错盲提取；第二部分利用方向编码对载体数据加权和负载.该方法具有实现简单、嵌入信息量大、图像失真小的优点.
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