本文選題：LED + 視覺當量��； 參考：《華中科技大學》2015年碩士論文

【摘要】：在LED芯片生產(chǎn)工藝流程中,LED芯片在進行封裝之前需要進行光電參數(shù)測試,然后進行分類分選,后續(xù)芯片封裝對分選后的芯片的排列精度要求很高。為了保證芯片的排列精度,在LED檢測分選一體機出廠前必須對其進行精度標定。然而,LED一體機精度標定比較復雜,而且當前的標定效率非常低。本文通過提出LED一體機視覺標定方法,并相應(yīng)的設(shè)計一套視覺標定裝置對相機視覺當量和旋轉(zhuǎn)中心及傳動比進行標定,主要內(nèi)容如下:首先對一般設(shè)備機床的精度標定方法進行分析,并著重對機器視覺相機標定方法的研究現(xiàn)狀進行了介紹。針對LED一體機需要進行標定的幾個部分進行了分析,并就設(shè)備視覺相關(guān)的標定提出技術(shù)方案。建立視覺系統(tǒng)相機成像幾何模型,分析鏡頭畸變對相機標定的影響。對視覺當量的標定方法進行了介紹,并設(shè)計一套標定裝置對其進行標定,實驗對比使用標定裝置前后的標定效果。對偏角芯片角度校正的原理進行分析,通過最小二乘法擬合出供給區(qū)旋轉(zhuǎn)中心坐標。采用標定板上圓點圖案對旋轉(zhuǎn)中心及傳動比進行標定,并通過偏角芯片的角度校正實驗驗證了由視覺標定的傳動比機械設(shè)計的傳動比精度更高。最后,采用標定裝置和原標定方法分別對視覺當量和旋轉(zhuǎn)中心及傳動比進行連續(xù)標定實驗,并將標定結(jié)果進行對比。實驗結(jié)果顯示采用標定裝置進行視覺標定時標定精度更高,而且耗時也明顯短很多。
[Abstract]:In the process of LED chip production, the LED chip needs to be tested by photoelectric parameters before packaging, and then classified and sorted. The subsequent chip packaging requires high arrangement precision of the separated chip. In order to ensure the precision of chip arrangement, the LED integrated machine must be calibrated before it leaves the factory. However, the precision calibration of LED integrated machine is complicated, and the calibration efficiency is very low. In this paper, the visual calibration method of LED integrated machine is proposed, and a set of visual calibration device is designed to calibrate the camera visual equivalent, rotation center and transmission ratio. The main contents are as follows: firstly, the precision calibration method of machine tool is analyzed, and the research status of machine vision camera calibration method is introduced. This paper analyzes several parts of LED integrated machine which need to be calibrated, and puts forward the technical scheme of equipment vision related calibration. The geometric model of camera imaging in visual system is established, and the effect of lens distortion on camera calibration is analyzed. The calibration method of visual equivalent is introduced, and a set of calibration device is designed to calibrate it. The principle of angle correction is analyzed, and the rotation center coordinates of feed region are fitted by least square method. The rotation center and the transmission ratio are calibrated by using the dot pattern on the calibration board, and the accuracy of the transmission ratio designed by the vision calibration than the mechanical design is verified by the angle correction experiment of the deflection chip. Finally, the visual equivalent, the rotation center and the transmission ratio were calibrated continuously by the calibration device and the original calibration method, respectively, and the calibration results were compared. The experimental results show that the calibration accuracy is higher and the time consuming is much shorter.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TP391.41;TN312.8

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本文編號：2098388