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Stability of zoom and fixed lenses used with digital SLR cameras
photogrammetry calibration accuracy stability digital camera zoom lens fixed lens
2015/8/24
Consumer grade digital cameras are widely used for close range photogrammetric applications because of the convenience of digital images and the low cost of capture and reproduction. Since the introdu...
Zoom-dependent calibration for consumer grade-cameras
self calibration camera calibration lens distortion zoom lens
2015/8/24
A significant practical constraint currently applying to the adoption of consumer-grade digital cameras for photogrammetric measurement is the requirement to record images at fixed zoom and focus sett...
应用Zoom FFT方法提高相干测风激光雷达频谱分辨率
激光雷达 相干探测 信号处理 频率细化
2016/8/17
脉冲相干测风激光雷达距离门内的回波具有中频高、频带宽、采样点稀疏等特点。采用传统的信号处理方法， 雷达频谱分辨率很难提高。在研究无线电雷达信号频谱细化技术的基础上， 采用Zoom FFT 频谱细化结合数字滤波器组的方法， 通过仿真研究验证了该方法对提高脉冲相干激光测风雷达的频谱分辨率具有良好效果。文章介绍了Zoom FFT 算法和数字滤波器组的原理，对模拟低频和高频信号进行了仿真，并且利用真实风场...
IMPLEMENTATION OF ZOOM-DEPENDENT CAMERA CALIBRATION IN CLOSE-RANGE PHOTOGRAMMETRY
Zoom-dependent calibration self-calibration close-range photogrammetry zoom lens distortion variation
2014/4/28
The application of consumer-grade cameras for photogrammetric measurement has traditionally been subject to the requirement that imagery is recorded at fixed zoom and focus settings. The camera is the...
Design and Analyses of a Planar Zoom Module as a Beam Expander
planar zoom module beam expander planar optics planar integrated free space optics diffractive optics
2011/11/25
A novel planar zoom module (PZM) is presented in this article. The PZM is realized by integrating optical elements on its surfaces with the folding optical axis and performing the zoom function by tra...
A Usability Evaluation of Web Map Zoom and Pan Functions（图）
Web Map Zoom Pan Interface Design Usability
2008/10/30
Due to limitations on screen size and resolution, the usability of web maps relies heavily on their interface design. The main goal of this research is to find better interface designs for web maps an...