如何将高斯模糊应用于openCV中的图片?

我在这方面完全是个初学者 openCV 所以请原谅我的问题是愚蠢的。基本上我是想申请 gussianBlur 但它显示了一个奇怪的错误我不明白为什么?

代码:

Mat tmp = new Mat (bitmap.getWidth(), bitmap.getHeight(), CvType.CV_8UC4);
Utils.bitmapToMat(bitmap, tmp);
//Imgproc.cvtColor(tmp, tmp, Imgproc.COLOR_RGB2HSV_FULL);
Imgproc.GaussianBlur(tmp,tmp,new org.opencv.core.Size(2,2),0,0);
Utils.matToBitmap(tmp,bitmap);
imgView.setImageBitmap(null);
imgView.setImageBitmap(bitmap);

错误:

CvException [org.opencv.core.CvException: cv::Exception: /hdd2/buildbot/slaves/slave_ardbeg1/50-SDK/opencv/modules/imgproc/src/smooth.cpp:816: error: (-215) ksize.width > 0 && ksize.width % 2 == 1 && ksize.height > 0 && ksize.height % 2 == 1 in function cv::Ptr<cv::FilterEngine> cv::createGaussianFilter(int, cv::Size, double, double, int)]
    at org.opencv.imgproc.Imgproc.GaussianBlur_1(Native Method)
    at org.opencv.imgproc.Imgproc.GaussianBlur(Imgproc.java:533)
    at opengl.community.myopencvexample.MainActivity$3.onClick(MainActivity.java:82)
    at android.view.View.performClick(View.java:4478)
    at android.view.View$PerformClick.run(View.java:18698)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:149)
    at android.app.ActivityThread.main(ActivityThread.java:5257)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
    at dalvik.system.NativeStart.main(Native Method)