I am working with android and the c++ OpenCV Libraries.
In Android I request (while Tracking) the latest Image of the TextureView which shows the Preview from the Camera:
private final ImageReader.OnImageAvailableListener mOnImageAvailableTrack =
new ImageReader.OnImageAvailableListener(){
@Override
public void onImageAvailable(ImageReader reader) {
if(mTaskfinished) {
mTaskfinished = false;
Log.w(TAG, "Open Framepuller Task");
Framepuller fPuller = new Framepuller();
fPuller.execute(reader.acquireLatestImage());
}
}
};
Framepuller is a AsyncTask which converts the Images Y Plane into a Byte array.
Image img = params[0];
Image.Plane Y = img.getPlanes()[0];
ByteBuffer byteBuffer = Y.getBuffer();
byte[] data = new byte[byteBuffer.remaining()];
byteBuffer.get(data);
int iWidth = img.getWidth();
int iHeight = img.getHeight();
img.close();
The Height and Width and the Data is moved to the JNIInterface I got and converted into a unsigned char*.
int len = env->GetArrayLength(data);
unsigned char* buf = new unsigned char[len];
env->GetByteArrayRegion(data, 0, len, reinterpret_cast(buf));
So now my Question is, how do I assign the ImageData from `buf` to a cv::Mat? can I just set the Mat like this:
cv::Mat img(width, height, CV_8UC1, imageData);
or
//Read somewhere that the rows/cols have to be adjusted like that if passing YUV data to MAT.
cv::Mat img(height + height/2, width, CV_8UC1, imageData);
What I achieve is, that in the Mat lays a grayscale Image of the YUV_420_888 I get from my Camera Preview.
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