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1. 发明授权

US6137589A Efficient storage of dithered raster image data in a printer or the like 失效
标题翻译：将抖动光栅图像数据高效地存储在打印机等中
公开(公告)号：US6137589A
公开(公告)日：2000-10-24
申请号：US137714
申请日：1998-08-21
申请人： Pere Obrador , Jordi Gonzalez , Jae Noh
发明人： Pere Obrador , Jordi Gonzalez , Jae Noh
IPC分类号： G06T9/00 , H04N1/411 , B41B15/00 , B41J15/00 , G06F15/00
CPC分类号： G06T9/007 , H04N1/411
摘要： Already stored uncompressed raster data are selectively compressed before any new raster data can be processed and stored. Both compressed and uncompressed raster data is preferably stored in the same size blocks, and the Raster Objects are preferably divided at Render Swath boundaries. Assuming that the Raster Object data has been or will be compressed by means of a known dither matrix, that dither matrix is used in the compression process to eliminate all but the data essential to reconstruct the dithered image, and the pixels of the original image are preferably successively processed along a predetermined scan path and the resultant linear pixel array is divided into successive runs which may each be encoded such that when those encoded runs are assembled into a replica of the original image and both the original image and the replica image are dithered with the same predetermined dither matrix, the dithered replica image is identical to the dithered original image. The dither-matrix based compression of the raster data is preferably followed by Golomb Rice compression.
摘要翻译：在可以处理和存储任何新的光栅数据之前，已经存储的未压缩光栅数据被选择性地压缩。压缩和未压缩的栅格数据都优选地存储在相同大小的块中，并且栅格对象优选地在渲染栅极边界处被划分。假设光栅对象数据已经或将通过已知的抖动矩阵进行压缩，则在压缩处理中使用该抖动矩阵以消除重建抖动图像所必需的所有数据，并且原始图像的像素为优选地沿着预定扫描路径连续处理，并且所得到的线性像素阵列被划分成连续的运行，每个运行可以被编码，使得当这些编码的运行被组装成原始图像的副本并且原始图像和副本图像都被抖动使用相同的预定抖动矩阵，抖动的复制图像与抖动的原始图像相同。栅格数据的基于抖动矩阵的压缩优选地跟随着Golomb Rice压缩。

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