c++ - OpenCV:如何读取 float 图像

Question

我在 openCV 中创建了一个 Mat，如下所示:

cv::Mat m = cv::Mat(10,10, CV_32FC1);
for(int i = 0; i < 10; i++){
    for(int j = 0; j < 10; j++){
        m.at<float>(i,j) = 1;
     }
}

并通过以下方式将其保存到磁盘:

imwrite("out.png", m);

我现在尝试按如下方式阅读它:

cv::Mat m = imread("out.png", CV_LOAD_IMAGE_UNCHANGED);

但是 m 中的数据似乎是完全随机的，当像 m.at<float>(5,5) 这样访问时例如。

如何读回写入的数据？例如，在 matlab 中我可以这样做:

m = imread("out.png") 

它给了我正确的 1 矩阵

谢谢

Answer 1

参见 imwrite

The function imwrite saves the image to the specified file. The image format is chosen based on the filename extension (see imread() for the list of extensions). Only 8-bit (or 16-bit unsigned (CV_16U) in case of PNG, JPEG 2000, and TIFF) single-channel or 3-channel (with ‘BGR’ channel order) images can be saved using this function. If the format, depth or channel order is different, use Mat::convertTo() , and cvtColor() to convert it before saving. Or, use the universal XML I/O functions to save the image to XML or YAML format.

depth , convertTo