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POBitmap in Android and Mat in OpenCV
 

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    <p>I have this code in OpenCV C++:</p> <pre><code>#include &lt;opencv2/imgproc/imgproc.hpp&gt; #include &lt;opencv2/highgui/highgui.hpp&gt; using namespace cv; int main(){ Mat src = imread("image.jpg"); if (src.empty()) return -1; pyrMeanShiftFiltering(src,src,10,20,1); imshow("src", src); waitKey(0); return 0; } </code></pre> <p>And this Sample1View.java class from OpenCV 2.4.2 as a sample named "OpenCV Tutorial 1 - Add OpenCV":</p> <pre><code>import org.opencv.android.Utils; import org.opencv.core.Core; import org.opencv.core.CvType; import org.opencv.core.Mat; import org.opencv.core.Point; import org.opencv.core.Scalar; import org.opencv.imgproc.Imgproc; import android.content.Context; import android.graphics.Bitmap; import android.util.Log; class Sample1View extends SampleViewBase { public static final int VIEW_MODE_RGBA = 0; public static final int VIEW_MODE_GRAY = 1; public static final int VIEW_MODE_CANNY = 2; private Mat mYuv; private Mat mRgba; private Mat mGraySubmat; private Mat mIntermediateMat; private Bitmap mBitmap; private int mViewMode; public Sample1View(Context context) { super(context); mViewMode = VIEW_MODE_RGBA; } @Override protected void onPreviewStarted(int previewWidth, int previewHeight) { synchronized (this) { // initialize Mats before usage mYuv = new Mat(getFrameHeight() + getFrameHeight() / 2, getFrameWidth(), CvType.CV_8UC1); mGraySubmat = mYuv.submat(0, getFrameHeight(), 0, getFrameWidth()); mRgba = new Mat(); mIntermediateMat = new Mat(); mBitmap = Bitmap.createBitmap(previewWidth, previewHeight, Bitmap.Config.ARGB_8888); } } @Override protected void onPreviewStopped() { if(mBitmap != null) { mBitmap.recycle(); } synchronized (this) { // Explicitly deallocate Mats if (mYuv != null) mYuv.release(); if (mRgba != null) mRgba.release(); if (mGraySubmat != null) mGraySubmat.release(); if (mIntermediateMat != null) mIntermediateMat.release(); mYuv = null; mRgba = null; mGraySubmat = null; mIntermediateMat = null; } } @Override protected Bitmap processFrame(byte[] data) { mYuv.put(0, 0, data); final int viewMode = mViewMode; switch (viewMode) { case VIEW_MODE_GRAY: Imgproc.cvtColor(mGraySubmat, mRgba, Imgproc.COLOR_GRAY2RGBA, 4); break; case VIEW_MODE_RGBA: Imgproc.cvtColor(mYuv, mRgba, Imgproc.COLOR_YUV420sp2RGB, 4); Core.putText(mRgba, "OpenCV + Android", new Point(10, 100), 3/* CV_FONT_HERSHEY_COMPLEX */, 2, new Scalar(255, 0, 0, 255), 3); break; case VIEW_MODE_CANNY: Imgproc.Canny(mGraySubmat, mIntermediateMat, 80, 100); Imgproc.cvtColor(mIntermediateMat, mRgba, Imgproc.COLOR_GRAY2BGRA, 4); break; } Bitmap bmp = mBitmap; try { Utils.matToBitmap(mRgba, bmp); } catch(Exception e) { Log.e("org.opencv.samples.tutorial1", "Utils.matToBitmap() throws an exception: " + e.getMessage()); bmp.recycle(); bmp = null; } return bmp; } public void setViewMode(int viewMode) { mViewMode = viewMode; } } </code></pre> <p>Now I want my code to work on Android so I replaced this line:</p> <pre><code>case VIEW_MODE_GRAY: Imgproc.cvtColor(mGraySubmat, mRgba, Imgproc.COLOR_GRAY2RGBA, 4); break; </code></pre> <p>to this:</p> <pre><code>case VIEW_MODE_GRAY: Imgproc.cvtColor(mGraySubmat, mRgba, Imgproc.COLOR_GRAY2RGBA, 4); Imgproc.pyrMeanShiftFiltering(mRgba,mRgba,10,20); break; </code></pre> <p>but I get this:</p> <pre><code>10-20 11:08:45.929: I/Sample::Activity(12846): Menu Item selected Preview GRAY 10-20 11:08:46.049: W/dalvikvm(12846): threadid=9: thread exiting with uncaught exception (group=0x4013a560) 10-20 11:08:46.059: E/AndroidRuntime(12846): FATAL EXCEPTION: Thread-10 10-20 11:08:46.059: E/AndroidRuntime(12846): CvException [org.opencv.core.CvException: ..\..\modules\imgproc\src\segmentation.cpp:345: error: (-210) Only 8-bit, 3-channel images are supported in function void cvPyrMeanShiftFiltering(const CvArr*, CvArr*, double, double, int, CvTermCriteria) 10-20 11:08:46.059: E/AndroidRuntime(12846): ] 10-20 11:08:46.059: E/AndroidRuntime(12846): at org.opencv.imgproc.Imgproc.pyrMeanShiftFiltering_1(Native Method) 10-20 11:08:46.059: E/AndroidRuntime(12846): at org.opencv.imgproc.Imgproc.pyrMeanShiftFiltering(Imgproc.java:7247) 10-20 11:08:46.059: E/AndroidRuntime(12846): at com.duckie.a.Sample1View.processFrame(Sample1View.java:80) 10-20 11:08:46.059: E/AndroidRuntime(12846): at com.duckie.a.SampleViewBase.run(SampleViewBase.java:185) 10-20 11:08:46.059: E/AndroidRuntime(12846): at java.lang.Thread.run(Thread.java:1019) </code></pre> <p>What seems to be the problem? How can I get my code to work in Android? And, how do I do this without having a delay?</p>
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