Video compression of coronary angiograms based on discrete wavelet transform with block classification
- Massachusetts General Hospital, Boston, MA (United States). Dept. of Radiology
- Univ. of California, Los Angeles, CA (United States)
- Atrium Technology Co., Ltd., Bangkok (Thailand)
A new method of video compression for angiographic images has been developed to achieve high compression ratio ({approximately}20:1) while eliminating block artifacts which leads to loss of diagnostic accuracy. This method adopts motion picture experts group`s (MPEG`s) motion compensated prediction to take advantage of frame to frame correlation. However, in contrast to MPEG, the error images arising from mismatches in the motion estimation are encoded by discrete wavelet transform (DWT) rather than block discrete cosine transform (DCT). Furthermore, the authors developed a classification scheme which label each block in an image as intra, error, or background type and encode it accordingly. This hybrid coding can significantly improve the compression efficiency in certain cases. This method can be generalized for any dynamic image sequences applications sensitive to block artifacts.
- OSTI ID:
- 415606
- Journal Information:
- IEEE Transactions on Medical Imaging, Journal Name: IEEE Transactions on Medical Imaging Journal Issue: 6 Vol. 15; ISSN 0278-0062; ISSN ITMID4
- Country of Publication:
- United States
- Language:
- English
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