Abstract:

Due to the experimental precision influenced by the radial distortion of general CCD vidicon, a radial distortion amendment method of Matlab image-process based on vertical wicking measurement was proposed. In this paper, Barrel-shaped distortion was collected by self-made calibration templet when using 1/2.5′CCD, and on this basis it constructs the relationship between trim size and the distorted image pels under the practical shooting distance. This amendment method based on the experimental demand of vertical wicking measurement takes a 300 mm sized distorted image as the object which is divided equally into 1mm pitch. According to the relation between the height of the hypotenuse representing the size of the distorted image and the right angle side representing the non-distorted image size in the right triangle, it regulates the pels in the fluctuation 0.5 mm of the center axis and 1 mm in number as the non-distorted images pels. The results show that the amendment can improve the image precision of wicking height extracted by Matlab image-process.