opencv:图像的创建和储存
示例代码:
#include <opencv.hpp> #include <vector> using namespace std; using namespace cv; void creatAlphaMat(Mat &mat) // 创建一个图像 { for (int i = 0; i < mat.rows; i++) { for (int j = 0; j < mat.cols; j++) { Vec4b&rgba = mat.at<Vec4b>(i, j); rgba[0] = UCHAR_MAX; rgba[1] = saturate_cast<uchar>((float(mat.cols - j)) / ((float)mat.cols)*UCHAR_MAX); rgba[2] = saturate_cast<uchar>((float(mat.rows - i)) / ((float)mat.rows)*UCHAR_MAX); rgba[3] = saturate_cast<uchar>(0.5*(rgba[1] + rgba[2])); } } } int main() { //创建带Alpha通道的 Mat Mat mat(480, 640, CV_8UC4); creatAlphaMat(mat); vector<int>compression_params; compression_params.push_back(IMWRITE_PNG_COMPRESSION); compression_params.push_back(9); try{ imwrite("透明值图.png", mat, compression_params); imshow("生成的PNG图", mat); fprintf(stdout, "PNG图片文件的数据保存完毕"); waitKey(0); } catch (runtime_error& ex){ fprintf(stderr, "图像转换发生错误:%s\n", ex.what()); return 1; } return 0; }
运行结果:
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