Dept. of Electr. Eng., Washington Univ., Seattle, WA.
IEEE Trans Image Process. 1997;6(7):956-64. doi: 10.1109/83.597271.
We present an algorithm for image browsing systems that embeds the output of binary Floyd-Steinberg (1975) error diffusion, or a low bit-depth gray-scale or color error diffused image into higher bit-depth gray-scale or color error diffused images. The benefits of this algorithm are that a low bit-depth halftoned image can be directly obtained from a higher bit-depth halftone for printing or progressive transmission simply by masking one or more bits off of the higher bit-depth image. The embedding can be done in any bits of the output, although the most significant or the least significant bits are most convenient. Due to constraints on the palette introduced by embedding, the image quality for the higher bit-depth halftone may be reduced. To preserve the image quality, we present algorithms for color palette organization, or binary index assignment, to be used as a preprocessing step to the embedding algorithm.
我们提出了一种用于图像浏览系统的算法，该算法将二进制 Floyd-Steinberg（1975）误差扩散的输出，或低比特深度灰度或彩色误差扩散图像嵌入到更高比特深度灰度或彩色误差扩散图像中。该算法的优点是，低比特深度半色调图像可以通过简单地从更高比特深度半色调图像中屏蔽一个或多个比特，直接从更高比特深度半色调图像获得用于打印或渐进传输的半色调图像。嵌入可以在输出的任何位中进行，尽管最高位或最低位最方便。由于嵌入引入的调色板约束，较高比特深度半色调的图像质量可能会降低。为了保持图像质量，我们提出了颜色调色板组织或二进制索引分配的算法，作为嵌入算法的预处理步骤。
