The intensity asymmetry inf uence on identifying error of stereo images

Abstract

The issues of increasing the accuracy and reliability of identifi cation of stereoscopic images due to a priori estimation of a specifi c identifi cation error that occurs when the intensity of the control image is asymmetric near the analyzed point (within the “window” of identifi cation) are considered. The mechanism of occurrence of such an error has been studied, a method for its prediction has been developed. The work methodology includes geometric analysis, analytical description of the image forming process and computer modeling. A certain version of the geometry of a stereoscopic television system is considered – with identical cameras, the optical axes of which are parallel to each other and orthogonal to the stereoscopic base. The a priori information used for the solution is the position of the relief reference plane. A technique for determining the center of intensity used in the method of predicting the identifi cation error has been developed. Using computer simulation, the infl uence of the asymmetry of the center of intensity relative to the center of the “window” on the identifi cation error and the possibility of its prediction is clearly demonstrated. The developed method can be used to make a decision to conduct a search procedure on the second stereo image or to reject the analyzed point in case of an unacceptably large predicted identifi cation error, as well as to limit the search interval on the second image and adjust the size of the “window” if necessary.