OpenCV错误:断言失败(channels()== CV_MAT_CN(dtype))

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问题描述

我有很多时间试图解决这个问题.这是我的日志文件(Android)中的以下错误

I'm having a lot of time trying to get solve this problem. This is the following error in my log file (Android)

error()﹕ OpenCV Error: Assertion failed (channels() == CV_MAT_CN(dtype)) in void cv::Mat::copyTo(cv::OutputArray) const, file /home/reports/ci/slave_desktop/50-SDK/opencv/modules/core/src/copy.cpp, line 212

我完全被困住了. Java代码会传入从.getNativeObjAddr()调用生成的长值.

I'm totally stumped. The Java code passes in the long values generated from the .getNativeObjAddr() calls.

有人知道这个错误吗?我无法跟踪android中的错误(jni c ++).

Does anyone know about this error? I cannot trace the error(jni c++) in android.

推荐答案

相同的问题.除了通道的灰度/颜色数问题外，还可能是您没有将正确的结构发送给函数，在我的情况下std :: vector< cv :: Point2d>在cv :: solvePnP()中.

Same problem.Apart from the gray/color number of channels problem, it could be that you do not send the proper structure to a function, in my case std::vector< cv::Point2d > in cv::solvePnP().

我做到了:

    ...
    std::vector<cv::KeyPoint> keypoints;
    _blob_detector->detect(image, keypoints);
    cv::solvePnP(_model_points, keypoints, _camera_matrix, _dist_coeffs, _rotation_vector, _translation_vector);
    // error 215 because sending cv::Keypoints vector instead of cv::Point2d vector
    // (same thing if trying to send a cv::Mat as second argument)

有效的方法是发送简单且正确的cv :: Point2d std :: vector:

What works is sending a simple and proper std::vector of cv::Point2d:

    ...
    std::vector<cv::KeyPoint> keypoints;
    _blob_detector->detect(image, keypoints);
    // copying to the correct structure
    std::vector<cv::Point2d> image_points;
    for (auto & keypoint : keypoints) image_points.push_back(keypoint.pt);
    cv::solvePnP(_model_points, image_points, _camera_matrix, _dist_coeffs, _rotation_vector, _translation_vector);
    // no error

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Opencv错误