便携式数字视频设备的图像编码技术研究

Research on the Image Coding Techniques for Portable Digital Video Devices

便携式数字视频设备的广泛应用使得如何在无线环境下传送中大尺寸和高分辨率图像视频成为主要难题,本文提出并实现了一种适用于便携式数字视频设备的中大尺寸和高分辨率图像的传送技术。我们采用DWT变换和嵌入式码流组织技术,实现了图像的渐进式传输和接受方驱动的感兴趣区域压缩和传送技术,可以在低带宽条件下快速、交互地传送清晰的、指定感兴趣区域的图像。实验和实际应用证明,本文所提出的算法适合在低带宽、不可靠无线信道下实现图像的编码与传输,能够为用户提供非常好的实时交互能力。

The wide use of portable digital video devices makes it hard to transmit large-sized and high-resolution images under wireless conditions. This paper designs and realizes a technique,which is suitable for portable digital video devices, for transmitting medium-and large-sized high-resolution images based on DWT transform and the embedded bit stream technology,and then transfer clear and appointed picture rapidly under low-bandwldth conditions. Experiments show that it has better flexibility in picture encoding and transmission under the wireless environment. The system we presented can support long-distance transmission services strongly and can improve the rapid response ability in unreliable wireless channels, so it can solve the matter of real-time interaction with each other.