期刊名称：International Journal of Advanced Research in Computer Engineering & Technology (IJARCET)
印刷版ISSN：2278-1323
出版年度：2012
卷号：1
期号：2
页码：39-42
出版社：Shri Pannalal Research Institute of Technolgy
摘要：The stereo vision ability is the basis that allows the brain to calculate qualitative depth information of the observed scene. The acquisition, storage, processing and comparison of such a huge amount of information require enormous computational power - with which nature fortunately provides us. Therefore, for a technical implementation, one should resort to other simpler measurement principles. The qualitative distance estimates of such knowledge-based passive vision systems can be replaced by accurate range measurements. This is because the basic principle of stereo vision is the extraction of characteristic contrast-related features within the observed scene and the comparison of their position within the two images. High resolution can only be achieved with a relatively large triangulation base and hence large camera systems. Powerful high functionality pixels demodulation of pixels extracts the target's distance and reflectivity from the received optical signal. This extracted information is modulated into the active optical signal during the time of propagation of the light (or time of flight) through the observed scene. Each pixel works like an individual high-precision stopwatch. Both devices have been integrated in separate range cameras working with modulated LED illumination and covering a distance range of 7.5 up to 15 meters. For non-cooperative diffusely reflecting targets these cameras achieve centimeter accuracy. The validity of this equation is confirmed by computer simulations and devices. Thus, prediction can be done on the range accuracy for given integration time, optical power, target distance and reflectance.
关键词：WDR CMOS image sensors; gated vision; global ; shutter; night vision; wide dynamic range; TFT LCD; ARM11
