Adaptive Zoom Distance Measuring System of Camera Based on the Ranging of Binocular Vision

Zhiyan Zhang; Wei Qian; Lei Pan; Yanjun Li
May 2012
Modern Applied Science;May2012, Vol. 6 Issue 5, p43
Academic Journal
Binocular vision ranging, according to the principle of parallax, represents the three dimensional depth in a parallax of 2d image plane. In order to improve the measurement accuracy of the binocular vision ranging, an adaptive zoom distance measuring methodology is focused on in the work. The causes of the error generation during the ranging process and its improvement difficulties are discussed. SIFT (Scale-invariant feature transform) is introduced to obtain parallax. With the samples of focal length acquired through the distance formula, the focal length function about distance is fitted through the least square method. A new distance formula is derived from the focal length function and the distance formula. In addition, a corresponding system is developed to realize the ranging process. To illustrate the procedure of the combination approach, an experiment is conducted with the developed system. The data from the experiment show that this technique can achieve accurate ranging. With the adaptive zoom method, ranging accuracy can reach more than 90%.


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