Java 用OpenCV检测矩形

Java 用OpenCV检测矩形,java,android,android-studio,opencv3.0,Java,Android,Android Studio,Opencv3.0,因此,我对OpenCV完全陌生,在过去的2-3天里,我搜索了很多关于如何在Java和Android studio中使用OpenCV来执行透视校正和检测位图中的最大矩形的信息,根据我的搜索,我做了一些工作,但结果位图不正确。我确信我做了很多错误的事情,所以这将是正确的如果有人帮我,那太好了 提前感谢你的帮助 public void onPictureTaken(byte[] data, Camera camera) { Bitmap myImage = BitmapFactory.dec

因此,我对OpenCV完全陌生,在过去的2-3天里,我搜索了很多关于如何在Java和Android studio中使用OpenCV来执行透视校正和检测位图中的最大矩形的信息,根据我的搜索,我做了一些工作,但结果位图不正确。我确信我做了很多错误的事情,所以这将是正确的如果有人帮我,那太好了

提前感谢你的帮助

public void onPictureTaken(byte[] data, Camera camera)
{

    Bitmap myImage = BitmapFactory.decodeByteArray(data, 0, data.length);
    Mat matImage = new Mat(myImage.getHeight(),myImage.getWidth(), CvType.CV_8UC3);
    Bitmap myBitmap32 = myImage.copy(Bitmap.Config.ARGB_8888, true);
    Utils.bitmapToMat(myBitmap32, matImage);

    correctPerspective(matImage);
}

公共静态透视图(Mat imgSource)
{
//将图像转换为黑白图像(8位)
Canny(imgSource.clone(),imgSource,50,50);
//将高斯模糊应用于平滑的点线
GaussianBlur(imgSource,imgSource,neworg.opencv.core.Size(5,5,5));
//找到轮廓
列表等高线=新的ArrayList();
Imgproc.findContours(imgSource、contours、new Mat()、Imgproc.RETR\u LIST、Imgproc.CHAIN\u APPROX\u SIMPLE);
双最大面积=-1;
MatOfPoint temp_contour=等高线。获取(0);
//用于启动的索引0
//点
MatOfPoint2f approxCurve=新的MatOfPoint2f();
对于(int idx=0;idx最大面积){
//检查此轮廓是否为正方形
MatOfPoint2f new_mat=新MatOfPoint2f(temp_contour.toArray());
int contourSize=(int)temp_contour.total();
MatOfPoint2f approxCurve_temp=新的MatOfPoint2f();
Imgproc.approxPolyDP(新垫,近似弯曲温度,轮廓尺寸*0.05,真实);
如果(近似曲线温度总计=4){
最大面积=轮廓面积;
近似曲线=近似曲线温度;
}
}
}
Imgproc.cvtColor(imgSource,imgSource,Imgproc.COLOR_BayerBG2RGB);
双[]双温度;
temp_double=approxCurve.get(0,0);
点p1=新点(温度双精度[0],温度双精度[1]);
temp_double=approxCurve.get(1,0);
点p2=新点(温度双精度[0],温度双精度[1]);
temp_double=approxCurve.get(2,0);
点p3=新点(温度双精度[0],温度双精度[1]);
temp_double=approxCurve.get(3,0);
点p4=新点(温度双精度[0],温度双精度[1]);
列表源=新的ArrayList();
来源.添加(p1);
来源:add(p2);
来源.添加(p3);
来源.增加(第4页);
Mat startM=转换器。矢量点2f到Mat(源);
Mat结果=翘曲(imgSource,startM);
//保存为位图
位图resultBitmap=Bitmap.createBitmap(result.cols(),result.rows(),Bitmap.Config.ARGB_8888);;
Mat tmp=new Mat(result.cols(),result.rows(),CvType.CV_8U,新标量(4));
Imgproc.cvtColor(结果、tmp、Imgproc.COLOR_RGB2BGRA);
Utils.matToBitmap(tmp,resultBitmap);
}

public static Mat warp(Mat inputMat,Mat startM)
{
int resultWidth=1200;
int resultHeight=680;
点ocvPOut4=新点(0,0);
点ocvPOut1=新点(0,结果右侧);
点ocvPOut2=新点(结果宽度,结果宽度);
点ocvPOut3=新点(结果宽度,0);
if(inputMat.height()>inputMat.width())
{
ocvPOut3=新点(0,0);
ocvPOut4=新点(0,结果右侧);
ocvPOut1=新点(结果宽度,结果宽度);
ocvPOut2=新点(结果宽度,0);
}
Mat outputMat=新Mat(结果宽度、结果宽度、CvType.CV_8UC4);
List dest=new ArrayList();
目的地添加(ocvPOut1);
目的地添加(ocvPOut2);
目的地添加(ocvPOut3);
目的地添加(ocvPOut4);
Mat endM=转换器。向量点2f到Mat(dest);
Mat perspectiveTransform=Imgproc.getPerspectiveTransform(startM,endM);
Imgproc.warpPerspective(输入框、输出框、透视变换、新大小(resultWidth、ResultWight)、Imgproc.INTER_立方体);
返回输出矩阵;
}

您找到解决方案了吗
public static void correctPerspective(Mat imgSource)
{

    // convert the image to black and white does (8 bit)
    Imgproc.Canny(imgSource.clone(), imgSource, 50, 50);

    // apply gaussian blur to smoothen lines of dots
    Imgproc.GaussianBlur(imgSource, imgSource, new org.opencv.core.Size(5, 5), 5);

    // find the contours
    List<MatOfPoint> contours = new ArrayList<MatOfPoint>();
    Imgproc.findContours(imgSource, contours, new Mat(), Imgproc.RETR_LIST, Imgproc.CHAIN_APPROX_SIMPLE);

    double maxArea = -1;
    MatOfPoint temp_contour = contours.get(0); 
    // index 0 for starting
    // point
    MatOfPoint2f approxCurve = new MatOfPoint2f();

    for (int idx = 0; idx < contours.size(); idx++) {
        temp_contour = contours.get(idx);
        double contourarea = Imgproc.contourArea(temp_contour);
        // compare this contour to the previous largest contour found
        if (contourarea > maxArea) {
            // check if this contour is a square
            MatOfPoint2f new_mat = new MatOfPoint2f(temp_contour.toArray());
            int contourSize = (int) temp_contour.total();
            MatOfPoint2f approxCurve_temp = new MatOfPoint2f();
            Imgproc.approxPolyDP(new_mat, approxCurve_temp, contourSize * 0.05, true);
            if (approxCurve_temp.total() == 4) {
                maxArea = contourarea;
                approxCurve = approxCurve_temp;
            }
        }
    }

    Imgproc.cvtColor(imgSource, imgSource, Imgproc.COLOR_BayerBG2RGB);

    double[] temp_double;
    temp_double = approxCurve.get(0, 0);
    Point p1 = new Point(temp_double[0], temp_double[1]);

    temp_double = approxCurve.get(1, 0);
    Point p2 = new Point(temp_double[0], temp_double[1]);

    temp_double = approxCurve.get(2, 0);
    Point p3 = new Point(temp_double[0], temp_double[1]);

    temp_double = approxCurve.get(3, 0);
    Point p4 = new Point(temp_double[0], temp_double[1]);

    List<Point> source = new ArrayList<Point>();
    source.add(p1);
    source.add(p2);
    source.add(p3);
    source.add(p4);
    Mat startM = Converters.vector_Point2f_to_Mat(source);

    Mat result = warp(imgSource, startM);

    //Saving into bitmap
    Bitmap resultBitmap = Bitmap.createBitmap(result.cols(),  result.rows(),Bitmap.Config.ARGB_8888);;
    Mat tmp = new Mat (result.cols(), result.rows(), CvType.CV_8U, new Scalar(4));
    Imgproc.cvtColor(result, tmp, Imgproc.COLOR_RGB2BGRA);
    Utils.matToBitmap(tmp, resultBitmap);

}
public static Mat warp(Mat inputMat, Mat startM)
{

    int resultWidth = 1200;
    int resultHeight = 680;

    Point ocvPOut4 = new Point(0, 0);
    Point ocvPOut1 = new Point(0, resultHeight);
    Point ocvPOut2 = new Point(resultWidth, resultHeight);
    Point ocvPOut3 = new Point(resultWidth, 0);

    if (inputMat.height() > inputMat.width())
    {
        ocvPOut3 = new Point(0, 0);
        ocvPOut4 = new Point(0, resultHeight);
        ocvPOut1 = new Point(resultWidth, resultHeight);
        ocvPOut2 = new Point(resultWidth, 0);
    }

    Mat outputMat = new Mat(resultWidth, resultHeight, CvType.CV_8UC4);

    List<Point> dest = new ArrayList<Point>();
    dest.add(ocvPOut1);
    dest.add(ocvPOut2);
    dest.add(ocvPOut3);
    dest.add(ocvPOut4);

    Mat endM = Converters.vector_Point2f_to_Mat(dest);

    Mat perspectiveTransform = Imgproc.getPerspectiveTransform(startM, endM);

    Imgproc.warpPerspective(inputMat, outputMat, perspectiveTransform, new Size(resultWidth, resultHeight), Imgproc.INTER_CUBIC);

    return outputMat;
}