Programming Cameras and Pan-Tilts: with DirectX and Java

本书介绍如何利用DirectX和Java为各种应用编程摄像头及全方位云台设备,包括从零开始构建DirectShow过滤器,并介绍了实现所需计算机视觉概念的方法。书中详细说明了如何为不同应用场景编程摄像头,适用于Visual C++.NET和Java Media Framework。

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The rapid rise of PC-based cameras has lead to the enormous growth of software applications that use real-time video programming. These applications include video conferencing, computer games, scientific research, automated security and surveillance, industrial inspection, and Web cameras. Previously, developers had to search through manufacturer manuals or research papers in computer vision or image processing to learn how to program devices for these applications.

Programming Cameras and Pan-Tilts with DirectX and Java is the first book to offer practical tools and techniques for those struggling to gain an in-depth understanding of programming computer vision applications with live camera streams and pan-tilt devices. It shows how to build DirectShow filters from scratch and introduces computer vision concepts as needed to understand the code. Special emphasis is devoted to DirectShow programming and popular computer vision applications such as segmentation and tracking.

*Shows step-by-step how to program cameras for a variety of applications in both Visual C++ .NET and the Java Media Framework (JMF).
*Describes programming methods proven in industrial and research settings that can be used with any camera that connects to a PC through a DirectShow-compliant frame grabber.
*Provides easy-to-understand explanations of the underlying concepts of the code examples suitable for those studying computer vision, image processing, or multimedia.
*Includes a CD-ROM with all the source code from the book and a companion Web site with additional code and application examples.

http://rapidshare.com/files/50543004/1558607560.rar
### Photo-SLAM 技术概述 Photo-SLAM 是一种先进的实时 SLAM(Simultaneous Localization and Mapping)系统,能够在单目、双目以及 RGB-D 相机上实现高效的定位与高质量的地图构建。它通过结合光度优化和几何建图方法,在多个维度上提升了系统的性能。 #### 定位效率与地图质量 Photo-SLAM 的核心优势在于其能够实现实时的高精度定位和高真实感的地图生成。具体而言,该系统在不同类型的传感器数据上进行了广泛验证,证明了其卓越的表现[^1]。无论是基于单目的稀疏特征点追踪还是利用 RGB-D 数据的深度信息,Photo-SLAM 均能提供稳定的姿态估计并生成细致的地图模型。 #### 单目相机的应用 对于单目相机,由于缺乏直接的距离测量能力,传统的 SLAM 方法通常依赖于三角化技术来恢复场景尺度。然而,这可能导致较大的累积误差。相比之下,Photo-SLAM 利用了光度一致性约束,即使仅依靠单一视角下的图像序列也能有效减少漂移现象,并保持较高的定位准确性[^4]。 ```python def single_camera_photo_slam(image_sequence): """ Simulates the core process of Photo-SLAM using a monocular camera. Args: image_sequence (list): A list of images captured by the mono-camera. Returns: tuple: Estimated trajectory, dense map representation. """ estimated_trajectory = [] dense_map = [] for frame in image_sequence: # Perform photometric optimization to refine pose estimation optimized_pose = perform_photometric_optimization(frame) # Update global map with new observations updated_dense_map = update_global_map(optimized_pose, frame) estimated_trajectory.append(optimized_pose) dense_map.extend(updated_dense_map) return estimated_trajectory, dense_map ``` #### 双目相机的优势 当扩展至双目配置时,额外的基线距离允许系统即时获取部分深度信息,从而进一步增强初始状态估计的可靠性。在此基础上,Photo-SLAM 继续发挥其独特的能力——即通过对齐重建后的彩色点云与当前观测值间的差异来进行精细化调整[^2]。 #### RGB-D 数据处理 针对配备有深度传感功能的 RGB-D 设备,Photo-SLAM 不仅继承了上述优点,还能充分利用预计算好的精确深度场完成更加复杂的任务,比如室内环境扫描或者动态障碍物规避等应用场景。此外,得益于现代硬件平台的支持,整个流程可以在资源受限的小型移动装置上流畅运行,展现出极强的实际部署价值[^3]。 --- ###
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