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I resolved this problem by using distanceTransform()

int palmCenter(string imageFileName) {
Mat srcImg = imread(imageFileName);
if (srcImg.empty()) {
    cout << "Filed to open the image " << imageFileName << endl;
    return -1;
}

Mat binaryImg;
cvtColor(srcImg, binaryImg, COLOR_BGR2GRAY);
threshold(binaryImg, binaryImg, 200, 255, THRESH_BINARY);
Mat distance;
distanceTransform(binaryImg, distance, DIST_L2, 5, CV_32F);

float maxDist = 0;
int x, y;
for (int i = 0; i < distance.rows; i++) {
    for (int j = 0; j < distance.cols; j++) {
        float dist = distance.at<float>(i, j);
        if (maxDist < dist) {
            x = j; y = i;
            maxDist = dist;
        }
    }
}

circle(srcImg, Point(x, y), 3, Scalar(255, 0, 255), 2, 8, 0);
imshow("palmCenter", srcImg);
waitKey(0);
return 0;

}

The result:

I resolved this problem by using distanceTransform()

int palmCenter(string imageFileName) {
Mat srcImg = imread(imageFileName);
if (srcImg.empty()) {
    cout << "Filed to open the image " << imageFileName << endl;
    return -1;
}

Mat binaryImg;
cvtColor(srcImg, binaryImg, COLOR_BGR2GRAY);
threshold(binaryImg, binaryImg, 200, 255, THRESH_BINARY);
Mat distance;
distanceTransform(binaryImg, distance, DIST_L2, 5, CV_32F);

float maxDist = 0;
int x, y;
for (int i = 0; i < distance.rows; i++) {
    for (int j = 0; j < distance.cols; j++) {
        float dist = distance.at<float>(i, j);
        if (maxDist < dist) {
            x = j; y = i;
            maxDist = dist;
        }
    }
}

circle(srcImg, Point(x, y), 3, Scalar(255, 0, 255), 2, 8, 0);
imshow("palmCenter", srcImg);
waitKey(0);
return 0;
0;  }

The result: