c++ opencv base64
时间: 2023-08-10 13:06:35 浏览: 63
在C++中使用OpenCV进行Base64编码和解码可以通过以下步骤实现:
1. 首先,需要包含OpenCV和Base64编码/解码所需的头文件:
```cpp
#include <opencv2/opencv.hpp>
#include <opencv2/core/base64.hpp>
```
2. 编码图像为Base64字符串:
```cpp
cv::Mat image = cv::imread("image.jpg"); // 替换为你的图像路径
std::vector<uchar> buffer;
cv::imencode(".jpg", image, buffer);
std::string base64_string = cv::base64::encode(buffer);
```
3. 解码Base64字符串为图像:
```cpp
std::vector<uchar> buffer = cv::base64::decode(base64_string);
cv::Mat image = cv::imdecode(buffer, cv::IMREAD_COLOR);
```
请确保在编译时链接OpenCV库。此外,注意处理异常情况以确保代码的健壮性。
相关问题
c++ base64转图片
在C++中,你可以使用base64解码库和图像处理库来将base64编码的字符串转换为图像。以下是一个使用OpenCV库的示例代码:
```c++
#include <iostream>
#include <string>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <boost/algorithm/string.hpp>
#include <boost/algorithm/string/trim.hpp>
#include <boost/algorithm/string/split.hpp>
#include <boost/algorithm/string/classification.hpp>
using namespace std;
using namespace cv;
int main()
{
// base64编码的图像字符串
string base64str = "/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAUDBAQEAwUEBAQFBQUGBwwIBwcHBw8LCwkMEQ8SEhEPERETFhwXExQaFRERGCEYGh0dHx8fExciJCIeJBweHx7/2wBDAQUFBQcGBw4ICA4eFBEUHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eHh4eH//AABEIAMAAgAMBIgACEQEDEQH/xAAcAAEAAgMBAQEAAAAAAAAAAAAABwgEBQYDAgL/xABDEAABAwIDBAcHBgkAAAAAAAABAgMRAAQFEiExQQYTIlFhcZGhweEUIzJCkrHB0fAzQ2JjssLR8RUWJDNy0v/EABYBAQEBAAAAAAAAAAAAAAAAAAECA//EACQRAQACAQIEBgcAAAAAAAAAAAABAgMRBBIhMUEDMlFh/9oADAMBAAIRAxEAPwD9Vjw2//9k=";
// 将base64编码的字符串转换为二进制数据
string decoded_data;
boost::algorithm::trim(base64str);
boost::algorithm::replace_all(base64str, "\r\n", "");
boost::algorithm::replace_all(base64str, "\n", "");
decoded_data = boost::algorithm::trim_copy(base64_decode(base64str));
// 将二进制数据转换为Mat对象
Mat imgbuf = imdecode(vector<uchar>(decoded_data.begin(), decoded_data.end()), IMREAD_COLOR);
// 显示图像
namedWindow("Image", WINDOW_NORMAL);
imshow("Image", imgbuf);
waitKey(0);
return 0;
}
```
在本例中,我们使用了base64解码库`base64_decode()`和图像处理库OpenCV中的`imdecode()`函数,将base64编码的字符串解码为二进制数据,并将其转换为OpenCV中的Mat对象。最后,我们使用`imshow()`函数显示图像。
树莓派安装c++opencv
您可以按照以下步骤在树莓派上安装C++ OpenCV:
1. 更新系统软件包:
```
sudo apt update
sudo apt upgrade
```
2. 安装必要的依赖项:
```
sudo apt install build-essential cmake git pkg-config
sudo apt install libjpeg-dev libtiff5-dev libjasper-dev libpng-dev
sudo apt install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
sudo apt install libxvidcore-dev libx264-dev
sudo apt install libgtk-3-dev
sudo apt install libcanberra-gtk*
sudo apt install libatlas-base-dev gfortran
sudo apt install python3-dev
```
3. 下载OpenCV源代码:
```
cd ~
mkdir opencv
cd opencv
git clone https://github.com/opencv/opencv.git
```
4. 下载OpenCV贡献模块(可选):
```
cd ~
mkdir opencv_contrib
cd opencv_contrib
git clone https://github.com/opencv/opencv_contrib.git
```
5. 编译和安装OpenCV:
```
cd ~/opencv/opencv
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/opencv_contrib/modules \
-D ENABLE_NEON=ON \
-D ENABLE_VFPV3=ON \
-D BUILD_TESTS=OFF \
-D INSTALL_PYTHON_EXAMPLES=OFF \
-D OPENCV_ENABLE_NONFREE=ON ..
make -j4
sudo make install
sudo ldconfig
```
6. 验证安装:
```
pkg-config --modversion opencv4
```
现在,您已经成功在树莓派上安装了C++版OpenCV。