STYDY ON LINE IMAGE TRANSMISSION OF HIGH-RESOLUTION PRINTED IMAGE PROCESSING SYSTEM

STYDY高分辨率印刷图像处理系统在线图像传输

• 批准号: 05452361
• 负责人: YAHAGI Takashi
• 金额: $ 4.74万
• 依托单位: CHIBA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452361/
• 关键词: Image Compression; Online Transmission; Printed Image; High-resolution Image; Image Processing System; JPEG; DCT; Block Size; 画像伝送; データ伝送; 伝送方式

Tehre have been proposed many kinds of digital image coding methds, and the JPEG method seems to most powerful. The JPEG method has already been adopted as an international standard for image compression. However, there are some shortcomings in this method. For example, the block size for DCT (Discrete Cosine Transform) is fixed to be 8*8. For high-resolution digital images, there are many pixels to be processed at a time. Therefore, it is very important to investigate how to compress an image efficiency.We have studied this problem, and found a very hopeful method foa compressing high-resolution digital images. The basic idea to to vary the block size for DCT according to the properties of local images. In this case, the relation between the block size and the properties of images are very important. We found a very useful index for determining the block size. This is called an activity index and it is very easy to obtain the value of the index. Based on this idea, we tried many kings of simulations for high-resolution images called SCID (Standard Co ; or Image Data) which will be adopted an international high-resolution digital color images. It was found that the proposed method is very effective for online transmission of high-resolution printed images.

目前已经提出了多种数字图像编码方法，其中JPEG方法是最有效的一种。JPEG方法已经被采用作为图像压缩的国际标准。然而，这种方法也存在一些缺点。例如，DCT（离散余弦变换）的块大小固定为8*8。对于高分辨率数字图像，一次要处理许多像素。因此，研究如何有效地压缩图像是非常重要的，我们对这个问题进行了研究，找到了一种很有希望的压缩高分辨率数字图像的方法。其基本思想是根据局部图像的性质来改变DCT的块大小。在这种情况下，块大小和图像属性之间的关系是非常重要的。我们发现了一个非常有用的索引来确定块的大小。这被称为活动指数，并且很容易获得指数的值。基于这一思想，我们尝试了许多种模拟高分辨率图像称为SCID（标准Co ;或图像数据），这将是一个国际高分辨率数字彩色图像。实验结果表明，该方法对于高分辨率印刷图像的在线传输是非常有效的。