android - 如何使用OpenCV处理自定义相机拍摄的照片

Question

我在 Android 上使用 OpenCV，我想使用 OpenCV 来处理我的自定义相机拍摄的照片，下面是我的代码:

//mOriginBitmap is taken by my custom camera.
mOriginMat = new Mat(mOriginBitmap.getHeight(), mOriginBitmap.getWidth(), CvType.CV_8UC4);

Utils.bitmapToMat(mOriginBitmap,mOriginMat);

mDestMat=new Mat(mOriginBitmap.getHeight(), mOriginBitmap.getWidth(), CvType.CV_8UC4);

Imgproc.GaussianBlur(mOriginMat,mDestMat,new Size(3,3),0);

Utils.matToBitmap(mDestMat,mDestBitmap);

mDestImage.setImageBitmap(mDestBitmap);

提前致谢。

更多细节，下面是异常，由Utils.bitmapToMat(mOriginBitmap,mOriginMat);抛出:

com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1037) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832) 
         Caused by: CvException [org.opencv.core.CvException: OpenCV(3.4.4) /build/3_4_pack-android/opencv/modules/java/generator/src/cpp/utils.cpp:38: error: (-215:Assertion failed) AndroidBitmap_lockPixels(env, bitmap, &pixels) >= 0 in function 'void Java_org_opencv_android_Utils_nBitmapToMat2(JNIEnv*, jclass, jobject, jlong, jboolean)'
        ]
            at org.opencv.android.Utils.nBitmapToMat2(Native Method)
            at org.opencv.android.Utils.bitmapToMat(Utils.java:93)
            at org.opencv.android.Utils.bitmapToMat(Utils.java:102)
            at com.example.dell.suppercamera.PictureActivity.onGaussianBlur(PictureActivity.java:103)

Answer 1

我解决了，Android相机拍的图片是YUV420sp，但是Mat需要ARGB888，所以我用Imgcodecs.imread方法加载图片:

File file = new File(getCacheDir(), "text.jpg");
mOriginMat = Imgcodecs.imread(file.getAbsolutePath());
Imgproc.cvtColor(mOriginMat,mOriginMat,Imgproc.COLOR_BGR2RGB);
mDestMat=new Mat(mOriginMat.rows(), mOriginMat.cols(), CvType.CV_8UC4);
Imgproc.GaussianBlur(mOriginMat,mDestMat,new Size(3,3),0);
mDestBitmap = Bitmap.createBitmap(mOriginMat.cols(), mOriginMat.rows(), Bitmap.Config.ARGB_8888);
Utils.matToBitmap(mDestMat,mDestBitmap);
mDestImage.setImageBitmap(mDestBitmap);