How can I encode and decode the depth image with opencv? I use the following code to get a depth ima-CodePudding

    // `s` is the webots's rangefinder
    auto buffer = (float*)s->getRangeImage();
    cv::Mat img(cv::Size(width, height), CV_32FC1, buffer);  // image data is float*

    // check and success.
    // imshow("pic", img); 
    // cvWaitKey(0);

    // encode:
    std::vector<uchar> newBuffer;
    cv::imencode(".jpg", img, newBuffer);

    // decode
    auto img_decode = cv::imdecode(newBuffer, cv::IMREAD_UNCHANGED);

    // fail and get a black image
    imshow("pic", img_decode);
    cvWaitKey(0);

I have try to use other params in function cv::imdecode like cv::IMREAD_ANYDEPTH but fail. I am searching for a long time on net. But no use. Please help or try to give some ideas how to achieve this.

CodePudding user response：

If your data is real, i.e. floating point, and single channel, you could try writing to a PFM or TIFF format image which will support that data type.

As @wohlstad mentions in the comments, JPEG is uint8 so only supports integers in the range 0..255.