Binary conversion and slant correction algorithm in preprocessing of license plate recognition 車牌識別預處理中的二值化及傾斜矯正算法
Editing floating - point values can result in minor inaccuracies because of decimal - to - binary conversion of fractional components 編輯浮點值時,由于要將小數(shù)部分從十進制轉(zhuǎn)換為二進制,因此所得的結(jié)果可能存在微小誤差。
To this problem a series of image rectification procedure which utilize geometric rectification theory in vehicle license recognition system are pointed out : we first locate vehicle license and execute the edge detection and binary conversion , then proceed calibration in which we use two calibration scheme looking for control point coordinate , one based on the hough transformation , the other based on image analysis method , and finally realize image correction in geometrical transform and bilinear gray interpolation method 針對此問題本文給出了一套將幾何畸變校正技術應用到汽車牌照自動識別系統(tǒng)中的車牌圖像校正方法:首先提取牌照信息,并對圖像進行邊緣檢測和二值化的預處理;然后提出了基于hough變換控制點提取和基于圖像分析法的控制點提取的兩種實時標定方法;最后通過空間坐標變換和灰度插值完成圖像的校正。