JPEG-LS 和 JPEG-LL 有什么区别？
有关 JPEG-LS 的信息很容易在 Google 和许多 DICOM 章节中找到。 然而，也有一些链接/页面/阅读材料提到了 JPEG-LL。然而，我更深入地研究了 DICOM 标准，没有一章提到过有关 JPEG-LL 的任何内容，但在很多其他一致性声明/论坛/文章中，都提到了 JPEG-LL...
那么，什么和JPEG-LS 和JPEG-LL 和有什么不一样？
Information about JPEG-LS is easily found on Google and in a lot of DICOM chapters.
However, there are links/pages/readings that mention JPEG-LL, too. However, i have taken a deeper look at the DICOM standard, not a chapter has ever mentioned anything about JPEG-LL, but in a lot of other conformance statements/forums/articles, JPEG-LL has been mentioned...
So, what is the difference between JPEG-LS and JPEG-LL?
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我认为JPEG-LL是JPEG的无损版本（通常称为JPEG Lossless），传输语法为1.2.840.10008.1.2.4.70，并且它是最常见的无损压缩。无论如何，它不是最好的（它不支持有符号像素值，并且其压缩率约为 2-2.5）。
JPEG-LS 是一种完全不同的标准，其传输语法为 1.2.840.10008.1.2.4.80，由 HP，它比标准 JPEG 更快且具有更好的比率。然而，它并没有被广泛使用。
I suppose JPEG-LL is the lossless version of the JPEG (usually called JPEG Lossless), with transfer syntax 1.2.840.10008.1.2.4.70, and it's the most common lossless compression. Anyway, it's not the best possible (it does not support signed pixel values, and its compression rates are about 2-2.5).
JPEG-LS is a completely different standard with transfer syntax 1.2.840.10008.1.2.4.80, developped by HP, which is faster and have better ratios than standard JPEG. However, it's not widely used.
我认为 JPEG-LL 指的是 ITU-T T.81、ISO/IEC IS 10918-1 又名 JPEG 无损。 JPEG-LS 指的是 ITU-T T.87、ISO/IEC IS 14495-1。
从技术上讲，JPEG-LL 与互联网网站上常见的 8 位有损 jpeg 完全相同。 JPEG-LS 不太常见。
I supposed JPEG-LL refers to ITU-T T.81, ISO/IEC IS 10918-1 aka JPEG lossless. While JPEG-LS refers to ITU-T T.87, ISO/IEC IS 14495-1.
Technically speaking JPEG-LL is exactly the same standard as the usual 8bits lossy jpeg as found on internet website. JPEG-LS is much much less common.