Java Code Examples for org.opencv.imgproc.Imgproc.getRotationMatrix2D()

The following are Jave code examples for showing how to use getRotationMatrix2D() of the org.opencv.imgproc.Imgproc class. You can vote up the examples you like. Your votes will be used in our system to get more good examples.
Example 1
Project: FTC2016   File: Transform.java   Source Code and License Vote up 7 votes
/**
 * Rotate an image by an angle (counterclockwise)
 *
 * @param image Transform matrix
 * @param angle Angle to rotate by (counterclockwise) from -360 to 360
 */
public static void rotate(Mat image, double angle) {
    //Calculate size of new matrix
    double radians = Math.toRadians(angle);
    double sin = Math.abs(Math.sin(radians));
    double cos = Math.abs(Math.cos(radians));

    int newWidth = (int) (image.width() * cos + image.height() * sin);
    int newHeight = (int) (image.width() * sin + image.height() * cos);

    // rotating image
    Point center = new Point(newWidth / 2, newHeight / 2);
    Mat rotMatrix = Imgproc.getRotationMatrix2D(center, angle, 1.0); //1.0 means 100 % scale

    Size size = new Size(newWidth, newHeight);
    Imgproc.warpAffine(image, image, rotMatrix, image.size());
}
 
Example 2
Project: mao-android   File: FdActivity.java   Source Code and License Vote up 7 votes
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {

        mRgba = inputFrame.rgba();
        mGray = inputFrame.gray();

        if (mAbsoluteFaceSize == 0) {
            int height = mGray.rows();
            if (Math.round(height * mRelativeFaceSize) > 0) {
                mAbsoluteFaceSize = Math.round(height * mRelativeFaceSize);
            }
            mNativeDetector.setMinFaceSize(mAbsoluteFaceSize);
        }

        MatOfRect faces = new MatOfRect();

        if (mDetectorType == JAVA_DETECTOR) {
            if (mJavaDetector != null)
                mJavaDetector.detectMultiScale(mGray, faces, 1.1, 2, 2, // TODO: objdetect.CV_HAAR_SCALE_IMAGE
                        new Size(mAbsoluteFaceSize, mAbsoluteFaceSize), new Size());
        } else if (mDetectorType == NATIVE_DETECTOR) {
            if (mNativeDetector != null)
                mNativeDetector.detect(mGray, faces);
        } else {
            Log.e(TAG, "Detection method is not selected!");
        }

        Rect[] facesArray = faces.toArray();
        for (int i = 0; i < facesArray.length; i++) {
            Imgproc.rectangle(mRgba, facesArray[i].tl(), facesArray[i].br(), FACE_RECT_COLOR, 3);
        }

        //转置90度
        Mat rotateMat = Imgproc.getRotationMatrix2D(new Point(mRgba.rows() / 2, mRgba.cols() / 2), 90, 1);
        Imgproc.warpAffine(mRgba, mRgba, rotateMat, mRgba.size());

        //以y轴翻转
        Core.flip(mRgba, mRgba, 1);

        return mRgba;
    }
 
Example 3
Project: RobotIGS   File: Transform.java   Source Code and License Vote up 6 votes
/**
 * Rotate an image by an angle (counterclockwise)
 *
 * @param image Transform matrix
 * @param angle Angle to rotate by (counterclockwise) from -360 to 360
 */
public static void rotate(Mat image, double angle) {
    //Calculate size of new matrix
    double radians = Math.toRadians(angle);
    double sin = Math.abs(Math.sin(radians));
    double cos = Math.abs(Math.cos(radians));

    int newWidth = (int) (image.width() * cos + image.height() * sin);
    int newHeight = (int) (image.width() * sin + image.height() * cos);

    // rotating image
    Point center = new Point(newWidth / 2, newHeight / 2);
    Mat rotMatrix = Imgproc.getRotationMatrix2D(center, angle, 1.0); //1.0 means 100 % scale

    Size size = new Size(newWidth, newHeight);
    Imgproc.warpAffine(image, image, rotMatrix, image.size());
}