first commit

third_party/cpp_base64/base64_test.cpp

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+#include <opencv2/opencv.hpp>
+#include <string>
+#include <iostream>
+#include "base64.h"
+
+/*
+ * convert base64 string to cv::Mat
+*/
+cv::Mat base64ToMat(const std::string& base64_data) {
+    std::string decoded_data = base64_decode(base64_data);
+    std::vector<uchar> data(decoded_data.begin(), decoded_data.end());
+    cv::Mat img = cv::imdecode(data, cv::IMREAD_UNCHANGED);
+    return img;
+}
+
+/*
+ * convert cv::Mat to base64 string
+*/
+std::string matToBase64(const cv::Mat& img, const std::string& ext = ".jpg") {
+    std::vector<uchar> buf;
+    cv::imencode(ext, img, buf);
+    std::string encoded = base64_encode(buf.data(), buf.size());
+    return encoded;
+}
+
+/*
+ * read image into mat, convert it to base64 string and convert back to mat
+ */
+int main() {
+    auto ori_mat = cv::imread("/windows2/zhzhi/github/vp_data/test_images/vehicle/0.jpg");
+    auto base64_str = matToBase64(ori_mat);
+    auto decoded_mat = base64ToMat(base64_str);
+
+    std::cout << "based64_str: " << base64_str << std::endl;
+    std::cout << "based64_str's length: " << base64_str.size() << std::endl;
+    std::cout << "ori mat's byte size: " << ori_mat.cols * ori_mat.rows * ori_mat.elemSize() << std::endl;
+
+    cv::imshow("ori_mat", ori_mat);
+    cv::imshow("decoded_mat", decoded_mat);
+
+    cv::waitKey(0);
+}