Purpose of scaling disparity in stereo vision

Question

This code calculates the disparity of two left and right stereo camera images (github link to the complete code and used images).

I do not understand why the disparity is scaled by (1/16) in disparity_sgbm.convertTo(disparity, CV_32F, 1.0 / 16.0f);.

int main(int argc, char **argv) {

    // 内参
    double fx = 718.856, fy = 718.856, cx = 607.1928, cy = 185.2157;
    // 基线
    double b = 0.573;

    // 读取图像
    cv::Mat left = cv::imread(left_file, 0);
    cv::Mat right = cv::imread(right_file, 0);
    cv::Ptr<cv::StereoSGBM> sgbm = cv::StereoSGBM::create(
        0, 96, 9, 8 * 9 * 9, 32 * 9 * 9, 1, 63, 10, 100, 32);    // 神奇的参数
    cv::Mat disparity_sgbm, disparity;
    sgbm->compute(left, right, disparity_sgbm);
    disparity_sgbm.convertTo(disparity, CV_32F, 1.0 / 16.0f);