c++ - 将灰度、彩色和 canny 图像 (3) 全部复制到一个大的 IplImage :Opencv Error?

Question

我有一个源代码 (test.cpp)，它应该显示从 avi 文件(逐帧)复制到大图像并显示在单个窗口中的三个图像(彩色、灰度和 canny)。我在 Linux 平台上使用带有 C++ 编译器 (gnu) 的 OpenCV 库。

但是我遇到了段错误(核心已转储)。

核心转储:

GNU gdb (GDB) 7.0.1-debian
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/ad/Desktop/opencv_exercises/ch4/ex1_b/test...done.

warning: Can't read pathname for load map: Input/output error.
Cannot access memory at address 0x5454505052525555
(gdb) r test.avi
Starting program: /home/ad/Desktop/opencv_exercises/ch4/ex1_b/test test.avi
[Thread debugging using libthread_db enabled]

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff627f831 in memcpy () from /lib/libc.so.6
(gdb) bt
#0  0x00007ffff627f831 in memcpy () from /lib/libc.so.6
#1  0x00007ffff6e5ee42 in cv::Mat::copyTo(cv::Mat&) const ()
   from /usr/lib/libcxcore.so.2.1
#2  0x00007ffff6e629fb in cvCopy () from /usr/lib/libcxcore.so.2.1
#3  0x0000000000400e0a in main (argc=2, argv=0x7fffffffe3a8) at test.cpp:55
(gdb) 

这里test.cpp的第55行是:

…… cvCopy(灰色, gray_sub);

……

下面给出的程序是(test.cpp)。是否可以复制三个图像(单个 IplImage 上的颜色、灰度和 canny)？我肯定做错了什么。是否可以帮助我找出我做错了什么？

#include <cv.h>
#include <highgui.h>
#include <stdio.h>


int main( int argc, char** argv )
{
    IplImage *frame;
    CvCapture *capture = NULL;


    if(( argc < 2 ) || !(capture = cvCreateFileCapture( argv[1] )))
    {
        printf("Failed to open %s\n", argv[1] );
        return -1;
    }

    double f = cvGetCaptureProperty(
        capture,
        CV_CAP_PROP_FRAME_COUNT
        );
    double fps = cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);



    CvSize size = cvSize(cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_WIDTH), cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT));
    IplImage *img = NULL;
    double index = 0;
    IplImage *gray = cvCreateImage(size,IPL_DEPTH_8U,1);
    IplImage *canny = cvCreateImage(size,IPL_DEPTH_8U,1);
    IplImage *long_img = cvCreateImage(cvSize(size.width*3, size.height),IPL_DEPTH_8U, 3);
    IplImage *color_sub, *gray_sub, *canny_sub;
    cvNamedWindow("ALLONE", 1);
    int key = 0;

    while( index++ < f)
    {       
            cvGrabFrame(capture);
        img = cvRetrieveFrame(capture);

        color_sub = cvCreateImageHeader(size, long_img->depth, long_img->nChannels);
        color_sub->origin = long_img->origin;
        color_sub->widthStep = long_img->widthStep;
        color_sub->imageData = long_img->imageData;

        cvCopy(img, color_sub);



        cvConvertImage(img, gray);
        gray_sub = cvCreateImageHeader(size, IPL_DEPTH_8U, 1);
        gray_sub->origin = long_img->origin;
        gray_sub->widthStep = long_img->widthStep;
        gray_sub->imageData = long_img->imageData + size.height * long_img->widthStep + size.width * long_img->nChannels;

        cvCopy(gray, gray_sub);


        cvCanny(gray, canny, 100, 200);
        canny_sub = cvCreateImageHeader(size, IPL_DEPTH_8U, 1);
        canny_sub->origin = long_img->origin;
        canny_sub->widthStep = long_img->widthStep;
        canny_sub->imageData = long_img->imageData + size.height * long_img->widthStep + (size.width * 2) * long_img->nChannels;

        cvCopy(canny, canny_sub);



        cvShowImage("ALLONE", long_img);

        key = cvWaitKey(10);
        if(key == 27) break;
        printf("%d\n", key);
    }




    cvReleaseCapture( &capture );

    return 0;
}

Answer 1

我找到了解决方案。有兴趣的代码如下:

#include <cv.h>
#include <highgui.h>
#include <stdio.h>


int main( int argc, char** argv )
{
    IplImage *frame;
    CvCapture *capture = NULL;


    if(( argc < 2 ) || !(capture = cvCreateFileCapture( argv[1] )))
    {
        printf("Failed to open %s\n", argv[1] );
        return -1;
    }

    double f = cvGetCaptureProperty(
        capture,
        CV_CAP_PROP_FRAME_COUNT
        );
    double fps = cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);



    CvSize size = cvSize(cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_WIDTH), cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT));
    IplImage *img = NULL;
    double index = 0;
    IplImage *gray = cvCreateImage(size,IPL_DEPTH_8U,1);
    IplImage *canny = cvCreateImage(size,IPL_DEPTH_8U,1);
    IplImage *long_img = cvCreateImage(cvSize(size.width*3, size.height),IPL_DEPTH_8U, 3);
    IplImage *color_sub, *gray_sub, *canny_sub;
    cvNamedWindow("ALLONE", 1);
    int key = 0;

    while( index++ < f)
    {       cvGrabFrame(capture);
        img = cvRetrieveFrame(capture);

        color_sub = cvCreateImageHeader(size, long_img->depth, long_img->nChannels);
        color_sub->origin = long_img->origin;
        color_sub->widthStep = long_img->widthStep;
        color_sub->imageData = long_img->imageData;

        cvCopy(img, color_sub);



        cvCvtColor(img, gray, CV_BGR2GRAY);
        gray_sub = cvCreateImageHeader(size,  long_img->depth,long_img->nChannels);
        gray_sub->origin = long_img->origin;
        gray_sub->widthStep = long_img->widthStep;
        gray_sub->imageData = long_img->imageData  + (size.width * long_img->nChannels);

        cvMerge(gray , gray, gray, NULL, gray_sub);


        cvCanny(gray, canny, 100, 200);
        canny_sub = cvCreateImageHeader(size, long_img->depth, long_img->nChannels);
        canny_sub->origin = long_img->origin;
        canny_sub->widthStep = long_img->widthStep;
        canny_sub->imageData = long_img->imageData +  ((size.width * 2)  * long_img->nChannels);

        cvMerge(canny , canny, canny, NULL, canny_sub);

        cvShowImage("ALLONE", long_img);

        key = (char) cvWaitKey(1000/fps);
        if(key == 27) break;
        printf("%d\n", key);
    }




    cvReleaseCapture( &capture );

    return 0;
}