Cubic Video Coding using 3-D Wavelet Transform

在本研究中，我们提出了一种新的基于相位运动估计的三维视频编码方案，以及一种新的三维EZW-IP编码器。在诸如MPEGIH.26x的传统视频编码方法中，采用了使用运动估计和DCT变换的混合编码方案。然而，实际上，这些方法仅使用几个帧的时间相关性。我们注意到这里，并旨在使用更多的时间相关性，以减少冗余。基于相位的运动补偿方法有效地补偿了相邻帧之间的运动。此外，在所提出的方法中，不需要逐帧地为每个输入图像准备参考图像。收集8个预测错误帧，并生成一个CUBE。采用三维EZW-IP编码方法。我们的编码方案提供了一些理想的功能，包括精确的比特率控制，质量和分辨率的可伸缩性，渐进传输，以及良好的压缩性能。此外，我们提出了一种新的四叉树结构的运动估计方法的基础上，相位相关，以减少预测误差。在传统的视频编码方案中，它们使用块匹配（BM）运动补偿和频率变换。然而，传统的BM方法在运动补偿部分的问题是计算要求高的任务。我们的目标是减少计算时间，并提出了一种新的四叉树结构的相位相关运动估计。相位相关法比BM法计算效率高。四叉树分层算法不仅减少了运动补偿误差，而且降低了计算复杂度。通过一些例子，我们提出的方法提供了一个很好的压缩性能和减少计算时间相比，BM方法。

In this research, we present a new three dimensional video coding scheme based on a Phase-based motion estimation, and new three dimensional EZW-IP coder. In the conventional video coding methods like MPEGIH.26x, hybrid coding scheme using motion estimation and DCT transform is adapted. However actually, these methods use only the temporal correlation of several frames. We pay attention here, and aimed to use much more temporal correlation to reduce the redundancy. The motions between successive frames are compensated effectively by phase-based motion compensation method. Moreover, it is not necessary to prepare the reference image for each input image frame by frame in this proposed method. 8 predicted-error frames are collected, and one CUBE is generated. And it is encoded by 3-D EZW-IP method. Our coding scheme provides some desirable features including exact bit-rate control, quality and resolution scalability, progressive transmission, and good compression performance.Furthermore, we propose a new quadtree-structured motion estimation method based on a phase correlation to reduce the prediction error. In the conventional video coding scheme, they use block-matching(BM) motion compensation and the frequency transform. However the problem of the conventional BM method in the part of motion compensation is the computational demanding task. We aim to reduce the computational times and present a novel quadtree-structured phase correlation motion estimation. Phase correlation method is very computationally efficient than the BM method. Quadtree hierarchy scheme reduces not only motion compensation errors but also the computational complexity. Through some examples, our proposed method provides a good compression performance and reduction of computational times as compared to BM method.