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Vision coordinate measurement in the calculation of feature point imaging centers

+1) + Port [g (+1, _ 『+1) a g (, _『 +1)] Finally, according to g (u,[link widoczny dla zalogowanych],) and g (u, _, +1) should be inserted: g (Ⅱ, t,[link widoczny dla zalogowanych],) = g (i,) (1 A a) (1 A b) + g (i +1,) a (1 A b) + g (i, +1) (1 A a) b + g ( i +1, +1) abI. /: R. / '\-JJr \ (r Figure 2 in the actual calculation, if for any u, value, provided that its value does not exceed [],[] Ⅱ, the largest integer,[link widoczny dla zalogowanych], then the above formula :=[.,= [t,] a = u a [u] b = t, a [port] which can be drawn upon by the centroid coordinate interpolation is calculated as follows: or (, yni) + u (u, Vi )=---- - L - ~ (5) plant (Y) + g (Ui) y (,[link widoczny dla zalogowanych], yni) + (, Vi) yc =------ L - I (6) plant (Y) +. g (ui) where, m for the interpolation points; n by (1) OK. Fourth, experimental analysis experiment using ROPERSCIENTIFIC's Co0l-SNAP camera, lenses ENIR lens with a focal plant = 8mm, CCD image plane pixels to 1392 (H) × 1040 (V), gray level as 1024. target probe from the CCD camera distance of about 1000mm,[link widoczny dla zalogowanych], objective characteristics of the probe has 5 points, aperture, such as .1 mm, 5 characteristic points of equal distance between the center distance , processing error is <0.01mm. Figure 3 shows the interpolation centroid algorithm and edge fitting the calculated three characteristic points of the two curves of the standard deviation of the center distance. curve from the 8 groups (abscissa) plotted the experimental data. The solid line is the interpolation centroid algorithm, dashed line for the introduction of the edge fitting. Figure 3 shows the center of mass distance interpolation is smaller than the standard deviation of the center of the edge obtained from the fitting method the standard deviation. interpolate the center of maximum from the standard deviation is less than 0.025 pixels. Therefore, the disc spring preload on the coordinate measuring machine positioning error of indication of broad Xuegui Xia Song Jianzhuo Xiaowei Zhao (Harbin Measuring Instruments, Harbin 150040, China) Abstract This paper summarizes the pre-set dish Spring positioning error of coordinate measuring machine, showing the impact of error and the solution. Keywords coordinate measuring machine disc spring air bearing positioning error of coordinate measuring machine for accurate positioning error correction, a direct impact on the indication of coordinate measuring machines error. And play in the flotation air bearing disc spring pre-load effect should be able to perform its normal role, will be directly related to the flotation coordinate measuring machine accurate positioning error correction, it can be said, pre-load disc Spring is the flotation coordinate measuring machine is one of the most important part, but their importance in the design and processing technology of its original arrangement and even the installation process has to. to the people are not paid enough attention. in the coordinate measuring machine The base supporting air bearing surface or the surface of the guide rail surface is very good, the relevant parts of the flotation in the air bearing relative to the fine under the rail surface friction-free movement position, in order to achieve complete measurement tasks. After the air bearing preload changes on the supply with a corresponding resilient, and pre-load the disc spring in the air bearing has a buffer, absorbing, storing energy and become rigid to achieve the role of dynamic equilibrium. If the pre-load disc spring in the flotation air bearing can not play its proper role, then the coordinate measuring machine positioning error of the benchmark is difficult to be precise in the process of debugging the amendment, and thus coordinate measuring machine accuracy of the error indication will be will be seriously affected. disc spring is steel stamping, is cut conical shape, in accordance with the provisions of the relevant national standards, the ideal disc spring shown in Figure 1.. limonene j {ll3 with interpolation centroid algorithm can achieve 40 sub-pixel CCD. V. CONCLUSIONS In this paper, the window based on first-order differential variable metric interpolation centroid algorithm expectations and making symmetrical shapes, especially the center of symmetry to strike imaging center, with high precision, is expected to achieve 40 sub-pixel CCD, and have some self-adaptive and effective noise rejection performance of the sound in Figure 3. References [1] ZhijiangZhang, YingjieYu. etc.Probeimagingvisioncoordinatemeasuringsystemusingsinglecamera.AE.MED-V01.10.1999 :175-180 [ ,],[
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