中文摘要：

预测和排序方法可使含水印图像获得高保真度，但不能在全平滑分块中嵌入信息。为此，提出一种基于基像素定位的数字图像平滑区域可逆信息隐藏方法。将含有／2个像素的全平滑子块中的第一个像素作为基像素，使用分块位置图进行定位来预测分块中其他像素的灰度值，使得其余n-1位可用于顺序嵌入信息比特。实验结果表明，该方法可保证较高的嵌入质量，能有效提升容量和峰值信噪比。

英文摘要：

High fidelity in watermarked image can be obtained based on prediction and sorting. However, information cannot be embedded into a whole smooth block. For this problem,a novel reversible information hiding method based on location of benchmark pixels in smooth region is proposed for digital images. It takes the first pixel as the benchmark pixel in all smooth sub block with n pixels. The block location map is used for localization to predict gray value of other pixels in the block. Thus, the remaining n - 1 pixels can be used to embed information bits. Experimental results verify the proposed method guarantees high fidelity. The method can also effectively improve the capacity and peak signal to noise ratio.