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void draw_projection(vector<int>& pos, int mode)
{
	vector<int>::iterator max = std::max_element(std::begin(pos), std::end(pos)); //求最大值
	if (mode == H_PROJECT)
	{
		int height = pos.size();
		int width = *max;
		Mat project = Mat::zeros(height, width, CV_8UC1);
		for (int i = 0; i < project.rows; i++)
		{
			for (int j = 0; j < pos[i]; j++)
			{
				project.at<uchar>(i, j) = 255;
			}
		}
		imshow("horizational projection", project);
	}
	else if (mode == V_PROJECT)
	{
		int height = *max;
		int width = pos.size();
		Mat project = Mat::zeros(height, width, CV_8UC1);
		for (int i = 0; i < project.cols; i++)
		{
			for (int j = project.rows - 1; j >= project.rows - pos[i]; j--)
			{
				//std::cout << "j:" << j << "i:" << i << std::endl;
				project.at<uchar>(j, i) = 255;
			}
		}
		imshow("vertical projection", project);
	}

	waitKey();
}