Fluency Function Approximation Method for D. T. P.
Fluency Function Approximation Method for D. T. P.
复制标题
D.T.P.的流畅函数逼近法
DOI：
10.11413/nig1987.39.169
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
K. Wada
中科院分区：
文献类型：
--
作者：
K. Toraichi;F. Kawazoe;K. Nakamura;T. Sugiyama;K. Wada
为了构建一个使用PC机和大型打印机的新型出版系统，使其能够产生高质量的文本、图表、插图等印刷品，需要一种新颖的编码方法，以保证解码后的图像在仿射变换放大或缩小后的质量。然而，传统的编码方法不能声称已经满足了这样的要求。本文提出了一种编码和解码二值图像的算法，该算法使用流畅函数自适应地逼近直线、圆弧和曲线形式的轮廓。此外，本文还导出了一种紧支持的2次采样函数来精确而简单地逼近曲线。为了证明我们提出的编码方法的有效性，我们在PC上实现了一个发布系统。利用该系统，基于CCITT测试文档，我们在解码图像的视觉质量和压缩比方面与MMR格式进行了比较。实验结果表明，即使在调整尺寸时，也能保持解码图像的质量，没有锯齿噪声。此外，我们的出版系统制作的招牌实际上已经在几个现场活动中使用。
To construct a new publishing system using PC and large-sized printer that can produce high quality printed matters comprising text, charts, and illustrations, etc, a novel coding method is needed to ensure the quality of decoded images even on Affine-transformed enlargement or reduction. Conventional coding methods, however, cannot claim to have satisfied such a requirement. This paper proposes an algorithm for encoding and decoding binary images by adaptively approximating the contours using Fluency functions in the form of straight lines, arcs, and curved lines that were proposed by one of the authors. Also, in this paper, we derives compactly supported sampling function of degree 2 to approximate curved lines with accuracy and simplicity. In order to demonstrate the usefulness of our proposed coding method, we implemented a publishing system on a PC. Using this system, we compared our method and the MMR format in terms of the visual quality of decoded images and compression ratio based on the CCITT test documents. From the experimental results, we demonstrate that the quality of the decoded images was also maintained without the jaggy noises even on resizing. Furthermore signboards produced by our publishing system have actually been used in several live events.