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各位晚上好,关于JPEG的概念问题
旧的JPEG标准(和JPEG2000相比)是不是也有"有损压缩"和"无损压缩"两种方式,有的文章上说只能进行"有损压缩",有的文章说两种都支持.不知该听谁的好,哪位搞图像的大侠指点一下,最好能帮忙发一份JPEG标准的文档资料(英文的更佳),本人要完成上面压下来的任务,写篇综述时刚好可以引用.E-Mail:steve_xiacn@yahoo.com.cn,先谢过各位了.
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steve_shun 2003-07-29
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诸位学长,哪位知道何处有直接支持JPEG2000显示的浏览器插件.我只见过支持LWF格式的插件,是个徳国公司产的,但不好用.支持JP2和J2K的都未曾见过.
karach 2003-07-29
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附加英文资料：
Details of the new JPEG-2000 standard, which is due to be published in March 2000, were released at the July meeting of SC29.
The new standard will cover bi-level, gray-level and color images.
It will provide a lower bit-rate mode of operation than the existing JPEG and JBIG standards it will replace, and will provide better rate distortion and subjective image quality.
Low bit-rate compression performance
– Below 0.25bpp grey scale images
Lossless and lossy compression
– Both in the same codestream
Large images
– Images greater than 64Kx64K
Single decompression architecture：Current architecture has 44 modes (not all used)
Transmission in noisy environments
Computer Generated Imagery
Compound documents
– Text (bi-level) images
Details of the new JPEG-2000 standard, which is due to be published in March 2000, were released at the July meeting of SC29.
The new standard will cover bi-level, gray-level and color images.
It will provide a lower bit-rate mode of operation than the existing JPEG and JBIG standards it will replace, and will provide better rate distortion and subjective image quality.
Low bit-rate compression performance
– Below 0.25bpp grey scale images
Lossless and lossy compression
– Both in the same codestream
Large images
– Images greater than 64Kx64K
Single decompression architecture：Current architecture has 44 modes (not all used)
Transmission in noisy environments
Computer Generated Imagery
Compound documents
– Text (bi-level) images
karach 2003-07-29
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如果要全部资料，karach@163.com
karach 2003-07-29
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JPEG2000提供了比JPEG和JBIG更低的位速率，将提供更好的速率失真和图象质量
必将替换现有的JPEG标准
具备的特征：
低位速率压缩性能：低于0.25bpp的灰度等级图像
在同一位流中包含有损和无损压缩 ///////////////////////////答案在这里
支持大于64K×64K的大型图象压缩
单一的解压体系结构：支持44种模式的操作
支持噪音环境的传输
支持计算机生成的图像
支持符合文档的压缩（例如，文本图像）
这是我们的教案！
必将替换现有的JPEG标准
具备的特征：
低位速率压缩性能：低于0.25bpp的灰度等级图像
在同一位流中包含有损和无损压缩 ///////////////////////////答案在这里
支持大于64K×64K的大型图象压缩
单一的解压体系结构：支持44种模式的操作
支持噪音环境的传输
支持计算机生成的图像
支持符合文档的压缩（例如，文本图像）
这是我们的教案！
xzygod 2003-07-28
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是的，jpeg有无损的标准，信发不过去，qq:170528 msn xzygod@hotmail.com
steve_shun 2003-07-28
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stevexiashun@vip.sina.com