Basics: Image CompressionThe pixel

Basics: Image Compression
The pixel data of a DICOM image object is compressed by a lossless or lossy means. Before images are archived in Impax, they are stored in lossless form in the archive cache, so that all original data can be recovered when the file is uncompressed.

With lossless compression, every single bit of data that was originally in the file remains after the file is uncompressed. All of the information is completely restored. When you view study images on the CD Viewer, Impax has uncompressed the study images before burning them, fully restoring all data contained within the images.

If the Impax cluster receives images from another cluster, these images may already be lossy compressed. Lossy compression reduces a file by permanently eliminating certain information, especially redundant information. When the file is uncompressed, only a part of the original information is still there (although you may not notice it). When viewing images in CD Viewer, look for a triangle in the bottom right corner of an image. This triangle indicates that the image has been lossy compressed.

結果 (繁體中文) 1:

基礎：圖像壓縮
一個DICOM圖像對象的像素數據是由一個無損或有損裝置壓縮。之前的圖像被存檔和的Impax，它們被存儲在檔案高速緩存無損形式，以使所有的原始數據可以在該文件是未壓縮。被回收利用無損壓縮，這是原本文件中的數據的每一個位保持後的文件是未壓縮的。所有的信息完全恢復。當你在CD查看器中查看圖像的研究，擁有的Impax未壓縮的研究燃燒它們，全面恢復包含在圖像中的所有數據之前的圖像。如果集群的Impax從另一個集群接收圖像，這些圖像可能已經有損壓縮的。有損壓縮通過永久消除某些信息，尤其是冗餘信息減少文件。當文件解壓縮，只有原始信息的一部分仍然存在（雖然你可能沒有注意到它）。當觀看圖像和CD查看器，請在圖像的右下角的三角形。這個三角形表示該圖像已被壓縮的有損。