Video compression algorithm for dynamic angiographic images
Bruce K. T. Ho, Pongskorn Saipetch, Jun Wei, Marco Ma, John D. Villasenor, Ming-Jing Tsai · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1994
We have developed a compression algorithm that achieves high compression ratio and excellent reconstruction quality for video rate or sub-video rate angiograms. Commercially available technology such as JPEG and MPEG do not satisfy medical requirements due to their severe block artifacts. Our new method takes advantage of the high temporal correlation of the angiographic frames using MPEG motion estimation software, but performs the error frame encoding using wavelet transform which is much more sensitive to localized block artifact features than the conventional discrete cosine transform. Our results show that at ratios up to 20:1, excellent image quality is obtained in reconstructed angiograms. Because of the excellent energy gathering and spatial localization properties of wavelet transform, high image fidelity and compression ratio can be simultaneously achieved. The algorithm is parallelizable and therefore can be implemented relatively easily in real time hardware.