遥感摄影在对地观测中的应用日益增多,为了能使更多的人较直观地认识遥感摄影系统,研究开发遥感摄影模拟系统对于在实验室模拟真实遥感摄影系统有重要意义.该模拟装置用普通可见光线阵 CCD 相‘机推帚采集图像,且图像数据无线传输.在电...遥感摄影在对地观测中的应用日益增多,为了能使更多的人较直观地认识遥感摄影系统,研究开发遥感摄影模拟系统对于在实验室模拟真实遥感摄影系统有重要意义.该模拟装置用普通可见光线阵 CCD 相‘机推帚采集图像,且图像数据无线传输.在电路设计中遵从系统模块化设计思想,提出了以 TI 公司的DSP(TMS320VC5402)和 A7121无线收发模组为核心器件的发射系统和接收系统的设计方案,通过 USB 芯片PDIUSBD12实现了采集电路与计算机的通信.给出了相应的硬件设计和软件流程图,调试结果表明该系统可以满足对图像进行实时采集并显示的要求.展开更多
In this paper,spatially angular multiplexing technique in pulsed digital holography and an optical system based on this technique are introduced.Optical simulation and calculating analysis show that the designed syste...In this paper,spatially angular multiplexing technique in pulsed digital holography and an optical system based on this technique are introduced.Optical simulation and calculating analysis show that the designed system can be employed to record ultra-fast events of a time resolution in nanosecond.展开更多
The paper presents the method of the valuation of random noise in the photogrammetric images, based on wavelets. The proposed method involves the analysis of the dynamics of the components of wavelet decomposition on ...The paper presents the method of the valuation of random noise in the photogrammetric images, based on wavelets. The proposed method involves the analysis of the dynamics of the components of wavelet decomposition on several resolution levels. The hypothesis was made that the noise-free images are characterized by systematically growing variances of the single components with growing decomposition. This hypothesis was. studied on several dozen fragments of airborne images recorded both with a photogrammetric analogue camera and digital camera. For all the studied photos taken with a digital camera, the hypothesis of growing variances of details was confirmed. The images from an analogue camera had different dynamics of variance, and the cause was recognized as random noise, caused by the grains from of the photographs. Referring to earlier applications of wavelets to noise evaluation, the proposed method is characterized by smaller dependence upon the structure and texture of the image.展开更多
文摘遥感摄影在对地观测中的应用日益增多,为了能使更多的人较直观地认识遥感摄影系统,研究开发遥感摄影模拟系统对于在实验室模拟真实遥感摄影系统有重要意义.该模拟装置用普通可见光线阵 CCD 相‘机推帚采集图像,且图像数据无线传输.在电路设计中遵从系统模块化设计思想,提出了以 TI 公司的DSP(TMS320VC5402)和 A7121无线收发模组为核心器件的发射系统和接收系统的设计方案,通过 USB 芯片PDIUSBD12实现了采集电路与计算机的通信.给出了相应的硬件设计和软件流程图,调试结果表明该系统可以满足对图像进行实时采集并显示的要求.
文摘In this paper,spatially angular multiplexing technique in pulsed digital holography and an optical system based on this technique are introduced.Optical simulation and calculating analysis show that the designed system can be employed to record ultra-fast events of a time resolution in nanosecond.
文摘The paper presents the method of the valuation of random noise in the photogrammetric images, based on wavelets. The proposed method involves the analysis of the dynamics of the components of wavelet decomposition on several resolution levels. The hypothesis was made that the noise-free images are characterized by systematically growing variances of the single components with growing decomposition. This hypothesis was. studied on several dozen fragments of airborne images recorded both with a photogrammetric analogue camera and digital camera. For all the studied photos taken with a digital camera, the hypothesis of growing variances of details was confirmed. The images from an analogue camera had different dynamics of variance, and the cause was recognized as random noise, caused by the grains from of the photographs. Referring to earlier applications of wavelets to noise evaluation, the proposed method is characterized by smaller dependence upon the structure and texture of the image.
