Effect of Intensity Asymmetry on Stereo Image Identification Error

The article addresses the issues of improving the accuracy and reliability in identifying stereo images via a priori estimation of the specific identification error arising from the asymmetry of reference image intensity near the analyzed point (within the identification “window”). The mechanism underlying this error is examined, and a method for its prediction is developed. The work methodology includes a geometric analysis, an analytical description of the imaging process, and computer simulation. A variant of stereoscopic television system geometry is considered, i.e., with identical cameras whose optical axes are parallel to each other and orthogonal to the stereoscopic base. Here, the position of the reference relief plane serves as a priori information for finding a solution. A procedure is developed for determining the intensity center, which is used in the identification error prediction method. Using computer simulation, the author demonstrates the effect produced by the intensity center asymmetry relative to the “window” center on the identification error and the possibility of predicting it. The developed method can be used to decide whether to perform a search procedure for the second stereo image or to reject the analyzed point in case of an unacceptably large predicted identification error, as well as to limit the search interval for the second image and adjust the “window” size if necessary.