通過(guò)攝像頭TWAIN 接口將百分表圖像提取出來(lái)后，使用區(qū)域分割的方法，將儀表表盤(pán)
各個(gè)部分特征提取出來(lái)：采用消影法獲得指針，Ostu 的類(lèi)間方差方法分割二值化指針，Hough 變換獲得指針邊緣直線進(jìn)而得到表盤(pán)中心，并利用百分表的特征將數(shù)字與刻度分離并分別進(jìn) 行標(biāo)記與識(shí)別。通過(guò)實(shí)驗(yàn)可以看到，這種基于數(shù)字、刻度與指針進(jìn)行綜合識(shí)別的方法，具有良好的識(shí)別效果。
關(guān)鍵詞：百分表； 圖像識(shí)別； 霍夫變換；最大類(lèi)間方差
Abstract: After detection of the certigratemeter by camera through TWAIN interface, every partof the meter can be obtained by region segmentation: achieve points by shadow elimination, segment the binary pointers by the way of criterion of maximum between-cluster which is put forward by Ostu, acquire the edge line of the points and center by Hough transform , and then stamp and recognise them after separating the numbers and grates according to the image character of Dial Indicator. Finally, the experiment shows that the method of synthetical recognition to numbers, grates, and pointers is very feasible.
Keyword: Dial Indicator, Image Recognition，Hough transform, criterion of maximum
between-cluster