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                                                                                                                                                              您的位置>首頁>新聞動態> 知識分享 | 機器視覺之定位工具的使用

                                                                                                                                                              發布時間: 2020-09-11    瀏覽量:1156


                                                                                                                                                              我們知道,機器視覺主要有以下4種應用功能:

                                                                                                                                                              1. 機器人引導

                                                                                                                                                              2. 缺陷、瑕疵檢測

                                                                                                                                                              3. 尺寸測量

                                                                                                                                                              4. 讀碼、OCR讀取


                                                                                                                                                              任何機器視覺應用的第一步通常會決定該應用的成功與否。此關鍵的第一步就是:

                                                                                                                                                              為物件做好正確的位置尋找。=> 定位


                                                                                                                                                              image.png


                                                                                                                                                              什么是定位工具

                                                                                                                                                              當元件在視野(FOV)中移動時,在元件上檢查一定區域的工具也必須移動,該過程由定位工具定位完成以便:

                                                                                                                                                              ·確定(X、Y)元件位置
                                                                                                                                                              ·確定角度
                                                                                                                                                              ·確定范圍變化

                                                                                                                                                              image.png

                                                                                                                                                              (X、Y)


                                                                                                                                                              image.png

                                                                                                                                                              (角度)


                                                                                                                                                              image.png

                                                                                                                                                              (范圍)


                                                                                                                                                              定位工具 – 固定裝置

                                                                                                                                                              每個定位工具產生一個固定裝置,固定裝置可包括X and/or Y、角度及比例信息。


                                                                                                                                                              ?邊線固定

                                                                                                                                                              只轉換(X或Y)固定

                                                                                                                                                              能夠通過同時利用定位邊線在X與Y方向使用邊線固定

                                                                                                                                                              適用于高速應用場合

                                                                                                                                                              image.png


                                                                                                                                                              ?圓與點固定

                                                                                                                                                              默認忽視角度

                                                                                                                                                              適用于高速應用程序


                                                                                                                                                              image.png


                                                                                                                                                              ?圖案固定

                                                                                                                                                              在搜索區域內尋找邊線組以組成幾何圖形


                                                                                                                                                              image.png


                                                                                                                                                              固定裝置應用案例


                                                                                                                                                              image.png



                                                                                                                                                              實際生產線遇到的難題



                                                                                                                                                              image.png

                                                                                                                                                              零件


                                                                                                                                                              image.png

                                                                                                                                                              尺寸差異


                                                                                                                                                              image.png

                                                                                                                                                              不同供貨商工件差異


                                                                                                                                                              image.png

                                                                                                                                                              模糊與對比度不佳



                                                                                                                                                              image.png

                                                                                                                                                              混雜背景


                                                                                                                                                              image.png

                                                                                                                                                              照明不一致


                                                                                                                                                              定位工具 – PatMax

                                                                                                                                                              PatMax是有效的圖案定位搜索技術,能夠處理旋轉及梯度變化等許多變化。

                                                                                                                                                              ?PatMax可以考慮或忽略 額外特征
                                                                                                                                                              ?PatMax圖案與像素格無關
                                                                                                                                                              ?其特征為表現圖像中不同區域間分界線的輪廓
                                                                                                                                                              ?以特征為基礎的表現形式比以像素表現形式更快并更準確地被轉換。

                                                                                                                                                              image.png



                                                                                                                                                              image.png

                                                                                                                                                              幾何定位學習


                                                                                                                                                              image.png

                                                                                                                                                              定位成功 ,含幾何特征擷取


                                                                                                                                                              image.png

                                                                                                                                                              零件轉動-定位成功


                                                                                                                                                              image.png

                                                                                                                                                              尺寸差異-定位成功


                                                                                                                                                              image.png

                                                                                                                                                              不同供貨商制程-定位成功


                                                                                                                                                              image.png

                                                                                                                                                              模糊與對比不佳-定位成功


                                                                                                                                                              image.png

                                                                                                                                                              零件移動-定位成功



                                                                                                                                                              image.png

                                                                                                                                                              混雜的背景-定位成功


                                                                                                                                                              image.png

                                                                                                                                                              照明不一致-定位成功


                                                                                                                                                              image.png

                                                                                                                                                              ITO - 0


                                                                                                                                                              image.png

                                                                                                                                                              ITO - 1


                                                                                                                                                              image.png

                                                                                                                                                              ITO - 2


                                                                                                                                                              image.png

                                                                                                                                                              ITO - 3


                                                                                                                                                              總結

                                                                                                                                                              定位工具

                                                                                                                                                              ?PatMax
                                                                                                                                                              ?圖案
                                                                                                                                                              ?邊線
                                                                                                                                                              ?圈
                                                                                                                                                              ?點

                                                                                                                                                              image.png

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