DarkNet——OpenCV版本遇到的问题

Dear 丶 2023-02-15 05:26 42阅读 0赞

Liunx编译安装带有OpenCV的DarkNet时，可能会出现编译安装的OpenCV版本造成DarkNet编译不过的问题。

OpenCV 3.9及以上，

IplImage 与 Mat 转换出现问题

./src/image\_opencv.cpp: In function ‘image mat\_to\_image(cv::Mat)’:  
./src/image\_opencv.cpp:63:20: error: conversion from ‘cv::Mat’ to non-scalar type ‘IplImage \{aka \_IplImage\}’ requested  
IplImage ipl = m;  
^  
compilation terminated due to -Wfatal-errors.  
Makefile:86: recipe for target 'obj/image\_opencv.o' failed  
make: \*\*\* \[obj/image\_opencv.o\] Error 1

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc_size_16_color_FFFFFF_t_70][]

定位到源码的位置 是 image\_opencv.cpp，如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc_size_16_color_FFFFFF_t_70 1][]

也就是Mat 类型和 IplImage类型相互转换的问题。

在OpenCV 3.8版本之前(包括3.8)，上述语法是正确的。在3.8版本之后，需要l利用 cvIplImage 来完成，

IplImage和Mat类型的转换，所以修改源码如下，即可：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc_size_16_color_FFFFFF_t_70 2][]

编译通过：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc_size_16_color_FFFFFF_t_70 3][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc_size_16_color_FFFFFF_t_70 4][]

以下利用OpenCV的不同版本来测试IplImage和Mat的转换。

OpenCV的3.8之前的版本：

#include <iostream>
    #include<opencv2/core/core.hpp>
    using namespace cv;
    using namespace std;
    int main()
    {
        Mat img = Mat::ones(3, 2, CV_8UC1);
        //
        IplImage ipl = img;
        cout << ipl.height << endl;
        cout << ipl.width << endl;
        ipl.imageData[0] = 10;
        cout << int(img.at<uchar>(0, 0)) << endl;
        return 0;
    }

OpenCV的3.9之后的版本：

#include <iostream>
    #include<opencv2/core/core.hpp>
    using namespace cv;
    using namespace std;
    int main()
    {
        Mat img = Mat::ones(3, 2, CV_8UC1);
        //
        IplImage ipl = cvIplImage(img);
        cout << ipl.height << endl;
        cout << ipl.width << endl;
        ipl.imageData[0] = 10;
        cout << int(img.at<uchar>(0, 0)) << endl;
        return 0;
    }

还有一个问题需要注意，在编译支持OpenCV的DarkNet时，最好不要编译成world版本的，否则会报出以下问题:

找不到对应的库

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc_size_16_color_FFFFFF_t_70 5][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200604172257398.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200605090744199.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc=,size_16,color_FFFFFF,t_70
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20200604172625854.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20200604172640121.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20200918141146760.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3d4Y2R6aGFuZ3Bpbmc=,size_16,color_FFFFFF,t_70