Breeuwer M, Heusdens R, Gunnewiek R K, Zwart P, Haas H P
Philips Research WY82, Eindhoven, The Netherlands.
Int J Card Imaging. 1995;11 Suppl 3:179-86. doi: 10.1007/BF01143138.
Medical x-ray images are increasingly stored and transmitted in a digital format. To reduce the required storage space and transmission bandwidth, data compression can be applied. In this paper we describe a new method for data compression of cardio-angiographic x-ray image series. The method is based on so-called overlapped-transform coding. A comparison with the well-known block-based transform-coding methods JPEG and MPEG is presented. We found that overlapped-transform coding does not introduce any blocking artefacts, in contrast to block-based transform coding, which introduces clearly visible blocking artefacts at compression ratios above 8. Clinical evaluations of the new method have pointed out that the image quality obtained at a compression ratio of 12 is adequate for diagnostic applications.
医学X光图像越来越多地以数字格式存储和传输。为了减少所需的存储空间和传输带宽，可以应用数据压缩。在本文中，我们描述了一种用于心血管造影X光图像序列数据压缩的新方法。该方法基于所谓的重叠变换编码。本文还将其与著名的基于块的变换编码方法JPEG和MPEG进行了比较。我们发现，与基于块的变换编码不同，重叠变换编码不会引入任何块状伪影，而基于块的变换编码在压缩比高于8时会引入明显可见的块状伪影。对新方法的临床评估指出，在压缩比为12时获得的图像质量足以用于诊断应用。
