目的基于深度图的绘制(DIBR)是一种新型的虚拟视点生成技术,在诸多方面得到了广泛的应用。然而,该技术还不能满足实时性的绘制需求。为了在保证绘制质量不下降的前提下,尽可能地提高绘制速度,提出了一种高效的3D-Warping(3维坐标变换)...目的基于深度图的绘制(DIBR)是一种新型的虚拟视点生成技术,在诸多方面得到了广泛的应用。然而,该技术还不能满足实时性的绘制需求。为了在保证绘制质量不下降的前提下,尽可能地提高绘制速度,提出了一种高效的3D-Warping(3维坐标变换)算法。方法主要在以下3个方面进行了改进:1)引入了深度—视差映射表技术,避免了重复地进行视差求取操作。2)对深度平坦的像素块进行基于块的3D-Warping,减少了映射的次数。对深度非平坦像素块中的像素点采取传统的基于像素点的3D-Warping,保证了映射的准确性。3)针对两种不同的3D-Warping方式,分别提出了相应的插值算法。在水平方向上,改进的像素插值算法对紧邻插值和Splatting(散射)插值算法进行了折中,只在映射像素点与待插值像素点很近的情况下才进行紧邻插值,否则进行Splatting插值;在深度方向上,它对Z-Buffer(深度缓存)技术进行了改进,舍弃了与前景物体太远的映射像素点,而对其他映射像素点按深度值进行加权操作。结果实验结果表明,与标准绘制方案的整像素精度相比,绘制时间平均节省了72.05%;与标准绘制方案的半像素精度相比,PSNR平均提高了0.355 d B,SSIM平均提高了0.001 15。结论改进算法非常适用于水平设置相机系统的DIBR技术中的整像素精度绘制,对包含大量深度平坦区域的视频序列效果明显,不但能够提高绘制的速度,而且可以有效地改善绘制的客观质量。展开更多
The growing demand for current and precise geographic information that pertains to urban areas has given rise to a significant interest in digital surface models that exhibit a high level of detail. Traditional method...The growing demand for current and precise geographic information that pertains to urban areas has given rise to a significant interest in digital surface models that exhibit a high level of detail. Traditional methods for creating digital surface models are insufficient to reflect the details of earth’s features. These models only represent three-dimensional objects in a single texture and fail to offer a realistic depiction of the real world. Furthermore, the need for current and precise geographic information regarding urban areas has been increasing significantly. This study proposes a new technique to address this problem, which involves integrating remote sensing, Geographic Information Systems (GIS), and Architecture Environment software environments to generate a detailed three-dimensional model. The processing of this study starts with: 1) Downloading high-resolution satellite imagery; 2) Collecting ground truth datasets from fieldwork; 3) Imaging nose removing; 4) Generating a Two-dimensional Model to create a digital surface model in GIS using the extracted building outlines; 5) Converting the model into multi-patch layers to construct a 3D model for each object separately. The results show that the 3D model obtained through this method is highly detailed and effective for various applications, including environmental studies, urban development, expansion planning, and shape understanding tasks.展开更多
文摘目的基于深度图的绘制(DIBR)是一种新型的虚拟视点生成技术,在诸多方面得到了广泛的应用。然而,该技术还不能满足实时性的绘制需求。为了在保证绘制质量不下降的前提下,尽可能地提高绘制速度,提出了一种高效的3D-Warping(3维坐标变换)算法。方法主要在以下3个方面进行了改进:1)引入了深度—视差映射表技术,避免了重复地进行视差求取操作。2)对深度平坦的像素块进行基于块的3D-Warping,减少了映射的次数。对深度非平坦像素块中的像素点采取传统的基于像素点的3D-Warping,保证了映射的准确性。3)针对两种不同的3D-Warping方式,分别提出了相应的插值算法。在水平方向上,改进的像素插值算法对紧邻插值和Splatting(散射)插值算法进行了折中,只在映射像素点与待插值像素点很近的情况下才进行紧邻插值,否则进行Splatting插值;在深度方向上,它对Z-Buffer(深度缓存)技术进行了改进,舍弃了与前景物体太远的映射像素点,而对其他映射像素点按深度值进行加权操作。结果实验结果表明,与标准绘制方案的整像素精度相比,绘制时间平均节省了72.05%;与标准绘制方案的半像素精度相比,PSNR平均提高了0.355 d B,SSIM平均提高了0.001 15。结论改进算法非常适用于水平设置相机系统的DIBR技术中的整像素精度绘制,对包含大量深度平坦区域的视频序列效果明显,不但能够提高绘制的速度,而且可以有效地改善绘制的客观质量。
文摘The growing demand for current and precise geographic information that pertains to urban areas has given rise to a significant interest in digital surface models that exhibit a high level of detail. Traditional methods for creating digital surface models are insufficient to reflect the details of earth’s features. These models only represent three-dimensional objects in a single texture and fail to offer a realistic depiction of the real world. Furthermore, the need for current and precise geographic information regarding urban areas has been increasing significantly. This study proposes a new technique to address this problem, which involves integrating remote sensing, Geographic Information Systems (GIS), and Architecture Environment software environments to generate a detailed three-dimensional model. The processing of this study starts with: 1) Downloading high-resolution satellite imagery; 2) Collecting ground truth datasets from fieldwork; 3) Imaging nose removing; 4) Generating a Two-dimensional Model to create a digital surface model in GIS using the extracted building outlines; 5) Converting the model into multi-patch layers to construct a 3D model for each object separately. The results show that the 3D model obtained through this method is highly detailed and effective for various applications, including environmental studies, urban development, expansion planning, and shape understanding tasks.
