我正在尝试使用OpenCV对齐两个图像。我基于发现的C++ / Python教程编写此代码:http://www.learnopencv.com/image-alignment-ecc-in-opencv-c-python/
android中的findTransformECC()
函数需要一个用于inputMask的额外参数。 C++和Python函数没有此功能。
我的代码:
import android.graphics.Bitmap;
import org.opencv.android.Utils;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.TermCriteria;
import org.opencv.imgproc.Imgproc;
import static org.opencv.core.CvType.CV_32F;
import static org.opencv.video.Video.MOTION_EUCLIDEAN;
import static org.opencv.video.Video.findTransformECC;
public class ImageProcessor {
public static Bitmap alignImages(Bitmap A, Bitmap B){
final int warp_mode = MOTION_EUCLIDEAN;
Mat matA = new Mat(A.getHeight(),A.getWidth(), CvType.CV_8UC3);
Mat matAgray = new Mat(A.getHeight(),A.getWidth(), CvType.CV_8U);
Mat matB = new Mat(B.getHeight(),B.getWidth(), CvType.CV_8UC3);
Mat matBgray = new Mat(B.getHeight(),B.getWidth(), CvType.CV_8U);
Mat matBaligned = new Mat(A.getHeight(),A.getWidth(), CvType.CV_8UC3);
Mat warpMatrix = Mat.eye(3,3,CV_32F);
Utils.bitmapToMat(A,matA);
Utils.bitmapToMat(B,matB);
Imgproc.cvtColor(matA,matAgray, Imgproc.COLOR_BGR2GRAY);
Imgproc.cvtColor(matB,matBgray,Imgproc.COLOR_BGR2GRAY);
int numIter = 5000;
double terminationEps = 1e-10;
TermCriteria criteria = new TermCriteria(TermCriteria.COUNT+TermCriteria.EPS,numIter,terminationEps);
findTransformECC(matAgray,matBgray,warpMatrix,warp_mode,criteria,matBgray);
Imgproc.warpPerspective(matA,matBaligned,warpMatrix,matA.size(),Imgproc.INTER_LINEAR+ Imgproc.WARP_INVERSE_MAP);
Bitmap alignedBMP = Bitmap.createBitmap(A.getWidth(),A.getHeight(),null);
Utils.matToBitmap(matBaligned,alignedBMP);
return alignedBMP;
}
}
我收到以下错误
W/System.err: CvException [org.opencv.core.CvException: cv::Exception: /build/master_pack-android/opencv/modules/imgproc/src/imgwarp.cpp:5987: error: (-215) (M0.type() == CV_32F || M0.type() == CV_64F) && M0.rows == 2 && M0.cols == 3 in function void cv::warpAffine(cv::InputArray, cv::OutputArray, cv::InputArray, cv::Size, int, int, const Scalar&)
W/System.err: ]
W/System.err: at org.opencv.video.Video.findTransformECC_0(Native Method)
W/System.err: at org.opencv.video.Video.findTransformECC(Video.java:132)
W/System.err: at com.test.imgptest.ImageProcessor.alignImages(ImageProcessor.java:42)
W/System.err: at com.test.imgptest.MainActivity.onActivityResult(MainActivity.java:141)
W/System.err: at android.app.Activity.dispatchActivityResult(Activity.java:6937)
W/System.err: at android.app.ActivityThread.deliverResults(ActivityThread.java:4122)
W/System.err: at android.app.ActivityThread.handleSendResult(ActivityThread.java:4169)
W/System.err: at android.app.ActivityThread.-wrap20(ActivityThread.java)
W/System.err: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1552)
W/System.err: at android.os.Handler.dispatchMessage(Handler.java:102)
W/System.err: at android.os.Looper.loop(Looper.java:154)
W/System.err: at android.app.ActivityThread.main(ActivityThread.java:6186)
W/System.err: at java.lang.reflect.Method.invoke(Native Method)
W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
最佳答案
您正在将完整的3x3
单应性矩阵warpMatrix
输入到findTransformECC
,但是您选择的warp_mode
是MOTION_EUCLIDEAN
。
如果要使用3x3
单应性,则应将warp_mode
设置为MOTION_HOMOGRAPHY
。
如果您要进行欧几里德变换,则只需将最后一行从输入warpMatrix
中剪切掉,因为欧几里德变换由2x3
矩阵给出。根据 findTransformECC()
documentation,
MOTION_EUCLIDEAN
sets a Euclidean (rigid) transformation as motion model; three parameters are estimated; warpMatrix is2x3
.
然后,由于您将使用
2x3
扭曲矩阵,因此请使用 warpAffine()
而不是warpPerspective()
对齐图像。
关于android - Android:使用OpenCV对齐图像,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44383801/