Opencv for Android(安卓)之透视变换

 /**     * 透视变换     * @param in 原图像     * @param point 定位到的四个点     * @return     */    private  Mat getWarpPersPective(Mat in,Point [] point){        MatOfPoint2f reusltPoint2f=null,srcPoint2f=null;        Mat out=new Mat();        Point []targetPoints=new Point[4];        for (int i=0;i<4;i++){            targetPoints[i]=new Point();        }  //这里拿到倾斜的长度作为宽高 结果可能比真正矫正的图片略小点 但是矫正效果还是很不错的    double rect_width = Math.sqrt(Math.abs(point[0].x - point[1].x)*Math.abs(point[0].x - point[1].x) +            Math.abs(point[0].y - point[1].y)*Math.abs(point[0].y - point[1].y));    double rect_height =  Math.sqrt(Math.abs(point[0].x - point[2].x)*Math.abs(point[0].x - point[2].x) +            Math.abs(point[0].y - point[2].y)*Math.abs(point[0].y - point[2].y));    double moveValueX = 0.0;    double moveValueY = 0.0;    targetPoints[0].x = 0.0 + moveValueX; targetPoints[0].y = 0 + moveValueY;// top_left    targetPoints[2].x = 0.0 + moveValueX; targetPoints[2].y = rect_height + moveValueY;// bottom_Left    targetPoints[1].x = rect_width + moveValueX; targetPoints[1].y = 0.0 + moveValueY;// top_Right    targetPoints[3].x = rect_width + moveValueX; targetPoints[3].y = rect_height + moveValueY;// bottom_Right    reusltPoint2f=new MatOfPoint2f(targetPoints);//这里需要将四个点转换成Mat    srcPoint2f=new MatOfPoint2f(point);    Mat tranform=getPerspectiveTransform(reusltPoint2f,srcPoint2f); // 透视变换    warpPerspective(in,out,tranform,new Size(rect_width,rect_height),INTER_LINEAR | WARP_INVERSE_MAP);    showImage(out);     return out;//变换后的Mat}

效果图如下这里只是对原图片进行了黑白处理只是为了处理更快而已

原图片变换后的图片

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