yungtrizzle's profile - activity

Transforming to single channel will lose color data which is not acceptable in this scenario. In terms of range, there is no limitation, although I would like to think that [0,1] would be better since floating point data is expected.

I'm doing a wavelet transform on the data which requires at most a 2d vector to compute the coefficients, I cannot pass a vector<vec3b> which would be the most convenient situation, I would still somehow need to create a vector<vector<double>>

Both data and idwt are 2d vectors, so you're saying my vectors needs to be bigger than 2d to hold 3 channels of data? How you would declare such a vector?

But this is a 24 bit 3 channel image, if I substitute your change I get a grayscale image that stretches out the partially reconstructed area. ibb. co/jYZPak

I have some code that pulls the pixel values from a mat (image from videocapture):

for (int k = 0; k < rows; k++) {
    for (int l = 0; l < cols; l++) {

        data[k][l] =  (double)frame.at<uchar>(k, l);

        }             
    }

After some transformations the data is written to file. I am trying to reconstruct the original image using these lines:

  cv::Mat frame(idwt.size(), idwt[0].size(), CV_8UC3);//CV_8UC3 8bit unsigned int 3 channels

for (int k = 0; k < idwt.size(); k++) {
    for (int l = 0; l < idwt[k].size(); l++) {

          frame.at<uchar>(k, l) = (unsigned char)std::round(idwt[k][l]); 
        //See ibb.co/j4AzO5
    }
}

Where the data is in idwt, declared as :

 std::vector<std::vector<double>> idwt(row, std::vector<double>(col));

I've inspected the original mat data, the transformed data and the reconstructed data and there is no error but I get a partial reconstructed image. (I have some links to related questions but not enough karma now to post). I cannot fathom why this fails in this way, I've read the docs and nothing seems like a solution to this.