三维扫描技术获取的三维轮廓数据体积较大, 不便于三维数字博物馆数据的实时传输和显示。针对这个问题, 提出了基于复合抖动技术的三维轮廓数据压缩方法。首先, 利用虚拟结构光投影系统实现三维轮廓数据的图像存储。然后, 对图像的不同通道使用不同的抖动技术进行处理, 并将结果保存到8位灰度图中主要的3位或者3幅1位逻辑图中, 实现三维轮廓数据的进一步压缩存储。实验表明, 与提供的三维模型格式相比提出方法的数据压缩比高达75.9∶1, 非常适合三维轮廓数据的实时传输、重建与显示。

The size of three dimensional (3D) profile data is too large for the 3D digital museum to properly transmit and display in real time. To solve the problem, this paper proposes a 3D profile data compression method based on composite dithering technique. Firstly, 3D profile data are stored into 24 bit image by utilizing the virtual structured-light projection system. Then, different dithering methods are applied to the different channels of the image, and the results are saved into the three most significant bits of the 8 bit grayscale image or three 1 bit logical images, to achieve a further compression of 3D profile data. The experimental results show that the proposed method achieves a compression ratio up to 75.9∶1 compared with the provided 3D model format, and is very suitable for real-time transmission, reconstruction and display of 3D profile data.