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                                                                                                                                                              您的位置>首頁>新聞動態> 影響視覺檢測設備精度的三個重要因素

                                                                                                                                                              發布時間: 2022-04-15    瀏覽量:107
                                                                                                                                                              機器視覺

                                                                                                                                                                隨著自動化工業的發展,機器視覺技術得到了廣泛的應用。例如,在自動化制造行業中,利用機器視覺測量和檢測工件的各種尺寸參數,如長度測量、圓測量、角度測量、圓弧測量、面積測量等。不僅可以獲取在線產品的尺寸參數,還可以對產品進行在線實時判斷和排序,應用廣泛。

                                                                                                                                                                基于機器視覺技術的檢測系統具有成本低、精度高、安裝方便等優點。再加上強大的可視化軟件,易于調整,靈活方便,測量數據可存儲,便于建立統計分析,快速發現和解決問題,是行業檢測技術的選擇。

                                                                                                                                                                然而,在一些機器視覺檢測項目中,許多客戶都遇到了檢測精度的問題。例如,要求以10um的精度測量加工零件的外部尺寸、內徑和外徑。目前很多配置選擇500萬攝像頭,理論上可以達到10um的精度。但是實際客戶測試的精度離10um的要求還很遠,能做到30um就很不錯了。誤差大的主要原因如下:

                                                                                                                                                              機器視覺


                                                                                                                                                                1.工業相機的選擇:很多客戶出于成本考慮選擇CMOS相機。拍攝物體邊緣時,其邊緣輪廓對比度差,噪聲大,給軟件測量帶來較大誤差。通常推薦使用CCD芯片相機。

                                                                                                                                                                2.相機鏡頭的選擇:因為很多機械部分的高度差,所以有很大的景深。但是由于視角的原因,普通鏡頭很難捕捉到零件的內壁,使得軟件很難找到真實準確的邊緣輪廓,對圖像處理算法提出了更高的要求。

                                                                                                                                                                  3.光源的選擇:很多客戶會選擇普通背光。目測精度不高時,背光有價格優勢。在要求較高的前提下,背光的原理是利用光通過漫反射板產生均勻柔和的光,在某一點產生的光會發散到空間的任意角度。檢測圓形和圓柱形物體時,會在被檢測物體的邊緣產生衍射。同時,光源的亮度對圖像的明暗也有很大的影響。

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