public static string Pic_Rectity(string FileName, string point_json)
{
string savepath = @"D:\OpenCV\Output\" + DateTime.Now.ToString("yyyyMMddhhmmssff") + ".jpg";
Base64Convert.Base64ToFileAndSave(FileName, savepath);//文件流保存到文件
Positions positions = new Positions();
string filepath = @"D:\OpenCV\Output\";
Mat src = Cv2.ImRead(savepath); //原始图像
List <Point> getpt = JsonConvert.DeserializeObject <List <Point> >(point_json);
Mat dst = new Mat();
//new Window("1", WindowMode.FreeRatio, src);
Mat roi = Mat.Zeros(src.Size(), MatType.CV_8U);
Point[] points = getpt.ToArray();
int maxX = points[0].X, maxY = points[0].Y, minX = points[0].X, minY = points[0].Y;
Point[][] contours = { points };
for (int i = 0; i < points.Length; i++)//求出最小坐标
{
if (points[i].X > maxX)
{
maxX = points[i].X;
}
if (points[i].Y > maxY)
{
maxY = points[i].Y;
}
if (points[i].X < minX)
{
minX = points[i].X;
}
if (points[i].Y < minY)
{
minY = points[i].Y;
}
}
int width = maxX - minX;
int height = maxY - minY;
Cv2.DrawContours(roi, contours, 0, Scalar.All(255), -1);
src.CopyTo(dst, roi);//保存到新画布
//new Window("转化前", WindowMode.FreeRatio, dst);
dst = dst.SubMat(new Rect(minX, minY, width, height));
Point2f[] pt = new Point2f[4];
for (int i = 0; i < points.Length; i++)//图像坐标
{
pt[i].X = points[i].X - minX;
pt[i].Y = points[i].Y - minY;
}
Point2f[] box = new Point2f[4];//画布角点
box[0] = new Point(0, 0);
box[1] = new Point(width, 0);
box[2] = new Point(width, height);
box[3] = new Point(0, height);
//图像的拉伸处理
var h = Cv2.GetPerspectiveTransform(pt, box);
Cv2.WarpPerspective(dst, dst, h, new Size(width, height));
filepath += DateTime.Now.ToString("yyyy-MM-dd hh_mm_ss_ff") + ".jpg";
Cv2.ImWrite(filepath, dst);
positions.FileName = Base64Convert.FileToBase64(filepath);
//positions.point2 = Findarea(dst);
string js = JsonConvert.SerializeObject(positions);
Console.WriteLine(js);
return(js);
//new Window("效果", WindowMode.FreeRatio, dst);
//Window.WaitKey();
}
