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how to useimshow in class member？

The following code is used in a class member. Image watch shows the correct picture, but imshow() only gives a gray picture. Am I making mistakes? Thanks a lot.

void plane::Display（）
{
using namespace cv;
Mat M(nPixel, nPixel, CV_8UC1);
double MAX = 0;
for (int i = 0; i < nPixel; i++)
        {
            for (int j = 0; j < nPixel; j++)
            {
                if (abs((*data)(i, j))>MAX)
                    MAX = pow(abs((*data)(i, j)), 2);
            }
        }

        for (int i = 0; i < nPixel; i++)
        {
            for (int j = 0; j < nPixel; j++)
            {
                M.at<uchar>(i, j) = pow(abs((*data)(i, j)), 2) / MAX * 255;
            }
        }
        namedWindow("Intensity", WINDOW_AUTOSIZE);
        imshow("Intensity", M);
}

how to useimshow use imshow in class member？

The following code is used in a class member. Image watch shows the correct picture, but imshow() only gives a gray picture. Am I making mistakes? Thanks a lot.

void plane::Display（）
{
using namespace cv;
Mat M(nPixel, nPixel, CV_8UC1);
double MAX = 0;
for (int i = 0; i < nPixel; i++)
        {
            for (int j = 0; j < nPixel; j++)
            {
                if (abs((*data)(i, j))>MAX)
                    MAX = pow(abs((*data)(i, j)), 2);
            }
        }

        for (int i = 0; i < nPixel; i++)
        {
            for (int j = 0; j < nPixel; j++)
            {
                M.at<uchar>(i, j) = pow(abs((*data)(i, j)), 2) / MAX * 255;
            }
        }
        namedWindow("Intensity", WINDOW_AUTOSIZE);
        imshow("Intensity", M);
}