In this paper, the techniques of image preprocessing and measuring stations' arrangement needed in a method for
measuring missile target's 3D poses based on the stereovision principle were studied. A strategy of combining region
segmentation technology with mathematical morphological tools to detect the contour of object, and then applying
Hough transform method together with the least squares fit skills to obtain the central axis line of the object on the image
plane was proposed and tested. The test results consistently show that the strategy has high degree of accuracy. The
matters need attention in measurement stations' arrangement were illustrated. All of this can be as the important
references for practicing the pose measurement method.
Practical application of two types of method for CCD camera's image center measurement is researched. With regard to image center, pixels' distribution to image plane is still symmetrical even under the influence of lens distortion. Based on this, with direct optical method, the image center is determined by the symmetry of pixels' position in vertical and horizontal directions on image plane. With lens distortion based perspective projection method, a complete imaging model is built and image center is a key element of the model. Two kinds of main lens distortion are considered in the model. Test is carried out and the comparison is made for two methods. The second method's strong convergence property is verified.
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