flycv与opencv同时读图，opencv读图失败，数据为空

[caoxiang520]

测试环境：台式ubuntu20.04，opencv3.4.14，flycv1.0.0 效果：fcv和opencv各自注释掉对方，独立的运行没问题，但是一起执行，opencv读图失败，图像数据为空

测试参考代码： #include #include <opencv2/opencv.hpp> #include <dirent.h> #include "flycv.h" #include "pthread.h" void calc_param(float& ratio, float& dww, float& dhh, int org_width, int org_height, int new_width, int new_hieght, bool is_auto, bool scale_fill, bool scale_up, int stride) { float r = std::min(new_width * 1.0 / org_width, new_hieght * 1.0 / org_height); if (!scale_up) r = std::min(r, float(1.0));

// ratio_w_ = r; // ratio_h_ = r; ratio = r; int new_unpad_w_ = int(org_width * r); int new_unpad_h_ = int(org_height * r); int dw = new_width - new_unpad_w_; int dh = new_hieght - new_unpad_h_; if (is_auto) { dw = dw % stride; dh = dh % stride; } else if (scale_fill) { dw = 0, dh = 0; new_unpad_w_ = new_width; new_unpad_h_ = new_hieght; float ratio_w_ = new_width * 1.0 / org_width; float ratio_h_ = new_hieght * 1.0 / org_height; } // dw_ = dw / 2.0; // dh_ = dh / 2.0; dww = dw / 2.0; dhh = dh / 2.0; } int main(int argc, char** argv) {

// // fcv的处理 fcv::Mat src_fcv = fcv::imread("../100.jpg"); std::cout << src_fcv.width() << " " << src_fcv.height() << std::endl; float ratio_fcv, dww_fcv, dhh_fcv; calc_param(ratio_fcv, dww_fcv, dhh_fcv, src_fcv.width(), src_fcv.height(), 640, 640, false, false, true, 2); fcv::Mat resize_im_fcv; double r_fcv = ratio_fcv; fcv::resize(src_fcv, resize_im_fcv, fcv::Size(), r_fcv, r_fcv); fcv::Mat padding_img_fcv; int top_fcv = int(round(dhh_fcv - 0.1)); int bottom_fcv = int(round(dhh_fcv + 0.1)); int left_fcv = int(round(dww_fcv - 0.1)); int right_fcv = int(round(dww_fcv + 0.1)); fcv::Scalar color_fcv(114, 114, 114); fcv::copy_make_border(resize_im_fcv, padding_img_fcv, top_fcv, bottom_fcv, left_fcv, right_fcv, fcv::BorderType::BORDER_CONSTANT, color_fcv); fcv::imwrite("padding_img_fcv.jpg", padding_img_fcv);

// //opencv的处理
cv::Mat src_cv = cv::imread("../200.jpg");
std::cout << src_cv.cols << "  " << src_cv.rows << std::endl;
float ratio, dww, dhh;
calc_param(ratio, dww, dhh, src_cv.cols, src_cv.rows, 640, 640, false, false, true, 2);
cv::Mat resize_im_cv;
cv::resize(src_cv, resize_im_cv, cv::Size(), ratio, ratio);
cv::Mat padding_img_cv;
int top = int(round(dhh - 0.1));
int bottom = int(round(dhh + 0.1));
int left = int(round(dww - 0.1));
int right = int(round(dww + 0.1));
cv::Scalar color_cv(114, 114, 114);
cv::copyMakeBorder(resize_im_cv, padding_img_cv, top, bottom, left, right, cv::BORDER_CONSTANT, color_cv);
cv::imwrite("padding_img_cv.jpg", padding_img_cv);
return 0;

}

[VoidSalts]

方便的话，可以在 // //opencv的处理 cv::Mat src_cv = cv::imread("../200.jpg"); std::cout << src_cv.cols << " " << src_cv.rows << std::endl;

这里前面加上一句 std::cout << "file read access : "<< access("../200.jpg", R_OK) << std::endl; (头文件加下#include <unistd.h>) 看下输出么

[caoxiang520]

file read access : 0

[VoidSalts]

我这边在x86的linux系统上试了下，确实有这个现象 目前推测原因是flycv与opencv的图像编解码实现都基于libpng，libjpeg/libturbojpeg等开源三方库，在一起链接时，如果版本不一致导致的问题 类似现象参考（开源库dlib与opencv一同使用时，imread为空）：https://stackoverflow.com/questions/59945307/cvimread-fails-in-c-project-when-we-mix-opencv-and-dlib 短期解决方案：两者共用时，图像IO仅使用其中一种