对于灰度图像，位深度量化有多少独特的色调。
For a grayscale image, the bit depth quantifies how many unique shades are available.
本文提出了一种新的对于灰度图像的几何矩的快速算法。
The paper proposes a novel approach to calculate geometric moment for gray level image.
实验表明对于灰度图像中即使0.4比特每像素的隐藏容量，仍可能获得较高的检测可靠性。这一方法同样适用于真彩图像。
Experimental results show that for gray-level images even if secret message capacity is as less as 0.4 bit per pixel, it is possible to achieve a high degree of …
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