Question

我在使用Core.inRange函数时遇到断言错误，实际上是任何Core。功能。我在类似问题的答案中都遵循了所有解决方案。其他解决方案是检查通道数，检查图像是否为空并验证安装。我在Mac上使用Android Studio 2.2。测试的电话是中兴Speed KitKat和Moto g3 Marshmallow。

我的目标是从图像中获取红色和蓝色 - ＆gt;确定红灯是打开还是打开蓝灯。代码从Vuforia Frame获取图像，将其转换为位图，然后尝试使用OpenCV来操作图像。在我们必须将Vuforia作为核心的一部分实施之前，这正在处理以前的代码。

这是代码的主要部分，Imgproc.cvtColor函数工作正常，它是最后一个Core.inRange

        Mat mat1 = new Mat(640,480, CvType.CV_8UC4);
        Mat mat2 = new Mat(640,480, CvType.CV_8UC4);
        Mat mat3 = new Mat(640,480, CvType.CV_8UC4);

        .......

        Log.d("OPENCV","Height " + rgb.getHeight() + " Width " + rgb.getWidth());

        Bitmap bm = Bitmap.createBitmap(rgb.getWidth(), rgb.getHeight(), Bitmap.Config.RGB_565);
        bm.copyPixelsFromBuffer(rgb.getPixels());
        //Mat tmp = OCVUtils.bitmapToMat(bm, CvType.CV_8UC4);
        Mat tmp = new Mat(rgb.getWidth(), rgb.getHeight(), CvType.CV_8UC4);
        Utils.bitmapToMat(bm, tmp);

        SaveImage(tmp, "-raw");
        fileLogger.writeEvent("process()","Saved original file ");
        Log.d("OPENCV","CV_8UC4 Height " + tmp.height() + " Width " + tmp.width());
        Log.d("OPENCV","Channels " + tmp.channels());

        tmp.convertTo(mat1, CvType.CV_8UC4);
        Size size = new Size(640,480);//the dst image size,e.g.100x100

        resize(mat1,mat1,size);//resize image
        SaveImage(mat1, "-convertcv_8uc4");
        Log.d("OPENCV","CV_8UC4 Height " + mat1.height() + " Width " + mat1.width());
        fileLogger.writeEvent("process()","converted to cv_8uc4");
        Log.d("OPENCV","Channels " + mat1.channels());

        Imgproc.cvtColor(mat1, mat2, Imgproc.COLOR_RGB2HSV_FULL);
        SaveImage(mat2, "-COLOR_RGB2HSV_FULL");
        Log.d("OPENCV","COLOR_RGB2HSV Height " + mat2.height() + " Width " + mat2.width());
        Log.d("OPENCV","Channels " + mat2.channels());

        //Core.inRange(mat2, RED_LOWER_BOUNDS_HSV, RED_UPPER_BOUNDS_HSV, mat3);
        Log.d("OPENCV","mat2 Channels " + mat2.channels() + " empty " + mat2.empty());
        Log.d("OPENCV","mat3 Channels " + mat3.channels() + " empty " + mat3.empty());
        Core.inRange(mat2, new Scalar(0,100,150), new Scalar(22,255,255), mat3);
                    fileLogger.writeEvent("process()","Set Red window Limits: ");
        SaveImage(mat3, "-red limits");

这是我在命令运行时得到的2个错误

       E/cv::error(): OpenCV Error: Assertion failed (scn == 3 || scn == 4) in void cv::cvtColor(cv::InputArray, cv::OutputArray, int, int), file /home/maksim/workspace/android-pack/opencv/modules/imgproc/src/color.cpp, line 7349
       E/org.opencv.imgproc: imgproc::cvtColor_10() caught cv::Exception: /home/maksim/workspace/android-pack/opencv/modules/imgproc/src/color.cpp:7349: error: (-215) scn == 3 || scn == 4 in function void cv::cvtColor(cv::InputArray, cv::OutputArray, int, int)

3张图像按预期保存在图片目录中。

我的日志记录产生以下内容

D/OPENCV: mat2 Channels 3 empty false
D/OPENCV: mat3 Channels 4 empty false

我尝试了两种不同的手机，尝试调低分辨率。我已经重新安装了OpenCV模块，以防它没有正确安装。我已经将图像全部设为3个频道，全部是4个频道。

Answer 1

经过一周的调试后，这是最愚蠢的错误！在SaveImage函数内 Imgproc.cvtColor（mat，mIntermediateMat，Imgproc.COLOR_RGBA2BGR，3）; 这就是造成这个问题的原因。在Core.inRange之后是SaveImage函数。 Core.inRange将通道删除为1 - fileLogger没有刷新最后一个日志，如果我使用了Log而不是我可能会更快地选择它。

public void SaveImage (Mat mat, String info) {
    Mat mIntermediateMat = new Mat();

    Imgproc.cvtColor(mat, mIntermediateMat, Imgproc.COLOR_RGBA2BGR, 3);  <--Here bad

    File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
    String filename = "ian" + info + ".png";
    File file = new File(path, filename);

    Boolean bool = null;
    filename = file.toString();
    bool = Imgcodecs.imwrite(filename, mIntermediateMat);

    if (bool == true)
        Log.d("filesave", "SUCCESS writing image to external storage");
    else
        Log.d("filesave", "Fail writing image to external storage");
}

OpenCV错误：调用Core.inRange时断言失败（scn == 3 || scn == 4）

1 个答案: