Valgrind无效读数4(OpenCV)
Valgrind Invalid read of size 4 (OpenCV)
这是我的代码:
template <typename TValue>
std::vector<cv::Point2i> GetPixelsWithValue(const cv::Mat& image, const TValue& value) {
std::vector<cv::Point2i> pixels;
cv::Size imageSize = image.size();
for(int i = 0; i < imageSize.height; ++i) {
for(int j = 0; j < imageSize.width; ++j) {
if(image.at<TValue>(i, j) == value) {
cv::Point2i pixel(j, i);
pixels.push_back(pixel);
}
}
}
return pixels;
}
valgrind正在给出此错误:
==10655== Conditional jump or move depends on uninitialised value(s)
==10655== at 0x4E88517: GetPixelsWithValue<int> (OpenCVExtensions.hpp:18)
==10655== by 0x4E88517: CountPixelsWithValue<int> (OpenCVExtensions.hpp:31)
...
==10655== Uninitialised value was created by a heap allocation
==10655== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==10655== by 0x117138EB: cv::fastMalloc(unsigned long) (alloc.cpp:64)
==10655== by 0x1184F795: cv::StdMatAllocator::allocate(int, int const*, int, void*, unsigned long*, int, cv::UMatUsageFlags) const (matrix.cpp:192)
==10655== by 0x118507BE: cv::Mat::create(int, int const*, int) (matrix.cpp:426)
==10655== by 0x4E9BA31: create (mat.inl.hpp:684)
==10655== by 0x4E9BA31: Mat (mat.inl.hpp:351)
==10655== by 0x4E9BA31: cv::Mat
....
==10655== Invalid read of size 4
==10655== at 0x4E88510: GetPixelsWithValue<int> (OpenCVExtensions.hpp:18)
....
==10655== Address 0x23201c92 is 127,346 bytes inside a block of size 127,347 alloc'd
==10655== at 0x4C2AB80: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==10655== by 0x117138EB: cv::fastMalloc(unsigned long) (alloc.cpp:64)
==10655== by 0x1184F795: cv::StdMatAllocator::allocate(int, int const*, int, void*, unsigned long*, int, cv::UMatUsageFlags) const (matrix.cpp:192)
==10655== by 0x118507BE: cv::Mat::create(int, int const*, int) (matrix.cpp:426)
==10655== by 0x4E9BA31: create (mat.inl.hpp:684)
==10655== by 0x4E9BA31: Mat (mat.inl.hpp:351)
我找到了这些等等:
在OpenCV中访问此矩阵时,为什么会遇到内存错误?
与矩阵类别(使用valgrind)
无效的写入大小为4但是,我没有理解为什么会遇到错误。这可能是OpenCV内部出现的错误?
找到了问题。正如@kerrek SB指出的那样,图像是问题所在。以下是一个更完整的示例。似乎非初始化的值错误是由于试图使用非初始化的矩阵。我可能还没有界限索引,这些索引导致无效读取错误。
#include "opencv2/highgui/highgui.hpp"
#include <iostream>
using namespace std;
using namespace cv;
std::vector<cv::Point2i> GetPixelsWithValue(const cv::Mat1b& image, const unsigned char& value) {
std::vector<cv::Point2i> pixels;
cv::Size imageSize = image.size();
for(int i = 0; i < imageSize.height; ++i) {
for(int j = 0; j < imageSize.width; ++j) {
if(image.at<unsigned char>(i, j) == value) {
cv::Point2i pixel(j, i);
pixels.push_back(pixel);
}
}
}
return pixels;
}
int main()
{
cv::Mat1b image(10, 12);
image.setTo(0); //enable this and all the uninitialized value errors go away
image(0,1) = 63;
image(1,3) = 63;
image(3,5) = 63;
image(4,7) = 63;
image(5,9) = 63;
// image(10,12) = 63; //causes invalid write error
std::vector<cv::Point2i> vec = GetPixelsWithValue(image, static_cast<unsigned char>(63));
std::cout << image(10,12) << std::endl; //bad access. causes invalid read error only
std::cout << vec.size() << std::endl;
return 0;
}
相关文章:
- C++,OpenCV,尝试显示图像时"OpenCV(4.3.0) Error: Assertion failed (size.width>0 && size.height>0)"此错误
- Openssl 1.1.1d无效使用不完整的类型"struct dsa_st"
- 无法访问嵌套类.类的使用无效
- 尝试导入pybind-opencv模块时出现libgtk错误
- 在编译C++代码(具有dlib和opencv)到WASM时面临问题
- 如何使用OpenCV将RBG图像转换为HSV,并将H、S和V值保存为C++中的3个独立图像
- OpenCV EqualizeHist()从彩色图像创建黑白图像
- 将OpenCV C++重写为EmguCV C#-如何使用指针
- OpenCV C++.快速计算混淆矩阵
- 如果用户输入无效,如何使用字符串变量-C++重复输入命令
- 在C++代码中包含opencv时,使用ctypes创建.so文件
- Valgrind无效读数4(OpenCV)
- 在OpenCV中调用stereoRectify会导致异常:帧指针无效
- 在 Windows 7 上安装 OpenCV 3.1.0 with CMake,opencv_ffmpeg.dll无效的
- OpenCV 提取的描述符会导致 valgrind 在被复制时报告无效读取
- 内置网络摄像头,opencv:有时有效,有时无效
- ConvertHull Android ndk和Opencv中的参数无效
- OpenCV free():无效指针:
- OpenCV无效操作数错误
- munmap_chunk(): 使用 openCV CV::P tr 的指针错误无效