我正在使用OpenCV和JNI开发一个Android项目。
实际上，我正在修改面部检测示例。
我的问题是，当我传递cv :: Mat引用时，它会给出一些奇怪的输出，并且无法成功传递。
为了让你了解情况，我在我的android应用程序的主要活动FdActivity.java中有这个：
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
rgb = inputFrame.rgba();
Mat res = mNativeDetector.process(rgb);
return res;
}
这个过程函数是这样的：
public Mat process(Mat rgb) {
Mat n = null;
if(rgb.empty()) {
System.out.println("Empty Image");
}
else {
System.out.println("The image is " + rgb.rows() + "x" + rgb.cols());
n = nativeSkinFilter(mNativeObj, rgb.getNativeObjAddr());
}
return n;
}
nativeSkinFilter是一个具有以下声明的本地函数
private static native Mat nativeSkinFilter(long thiz, long inputImage);
在C++端，我有一个函数声明（DetectionBasedTracker.h）：
JNIEXPORT jlong JNICALL Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeSkinFilter (JNIEnv *, jclass, jlong);
我想做的唯一一件事就是返回同样的图像，只是通过C++函数传递（如果我知道如何正确地传递矩阵，则会进行更复杂的实现），因此代码看起来像这样（DetectionBasedTracker.cpp）：
JNIEXPORT jlong JNICALL Java_org_opencv_samples_facedetect_DetectionBasedTracker_nativeSkinFilter (JNIEnv * jenv,jclass,jlong rgb)
{
Mat* rgba = (Mat*) rgb;
if(rgb == 0) {
LOGD("Null matrix");
}
else {
LOGD("The matrix is not null. It has %i rows and %i columns", (*rgba).rows, (*rgba).cols);
}
return (jlong)rgb;
}
我得到的输出如下所示：
07-07 13:00:07.671: I/Choreographer(14980): Skipped 55 frames! The application may be doing too much work on its main thread.
07-07 13:00:07.701: E/BufferQueue(14980): [unnamed-14980-0] dequeueBuffer: min undequeued buffer count (2) exceeded (dequeued=6 undequeudCount=0)
07-07 13:00:07.741: I/JavaCameraView(14980): Preview Frame received. Need to create MAT and deliver it to clients
07-07 13:00:07.741: I/JavaCameraView(14980): Frame size is 576000
07-07 13:00:07.761: I/System.out(14980): The image is 480x800
07-07 13:00:07.761: D/FaceDetection/DetectionBasedTracker(14980): The matrix is not null. It has 1937716000 rows and 0 columns
07-07 13:00:07.761: E/cv::error()(14980): OpenCV Error: Assertion failed (src.dims == 2 && info.height == (uint32_t)src.rows && info.width == (uint32_t)src.cols) in void Java_org_opencv_android_Utils_nMatToBitmap2(JNIEnv*, jclass, jlong, jobject, jboolean), file /home/reports/ci/slave_desktop/50-SDK/opencv/modules/java/generator/src/cpp/utils.cpp, line 97
07-07 13:00:07.761: E/org.opencv.android.Utils(14980): nMatToBitmap catched cv::Exception: /home/reports/ci/slave_desktop/50-SDK/opencv/modules/java/generator/src/cpp/utils.cpp:97: error: (-215) src.dims == 2 && info.height == (uint32_t)src.rows && info.width == (uint32_t)src.cols in function void Java_org_opencv_android_Utils_nMatToBitmap2(JNIEnv*, jclass, jlong, jobject, jboolean)
07-07 13:00:07.761: A/libc(14980): Fatal signal 11 (SIGSEGV) at 0x0000000a (code=1), thread 15115 (Thread-5379)
07-07 13:00:07.791: E/BufferQueue(14980): [unnamed-14980-0] dequeueBuffer: min undequeued buffer count (2) exceeded (dequeued=5 undequeudCount=1)
07-07 13:00:07.801: I/JavaCameraView(14980): Preview Frame received. Need to create MAT and deliver it to clients
07-07 13:00:07.801: I/JavaCameraView(14980): Frame size is 576000
我觉得我已经尝试了所有的方法，但似乎正确的方法仍然失败了。你能帮忙吗？
非常感谢您花费时间！真的很感激您的帮助。