Update README.md

tanzby · web-flow · commit fe782d96f538 · 2017-08-27T23:13:11.000+08:00
diff --git a/README.md b/README.md
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 # BirdViewTransform
 Put FOUR image(or video stream) from 4 different directions together, and form them into a bird view. 
+
+## About
+
+I have four imgs, such as(from up to down: left, forward, right, backward)
+
+![Left](img/0.png)
+
+![Forward](img/1.png)
+
+![Right][img/2.png)
+
+![Backward](img/3.png)
+
+using this programe, we can get
+
+![after transform](img/ok.png)
+
+## other
+
+Before birdEye transform, Calibrationof camera is needed! here is a [link](http://tanzby.cn/2017/08/01/%E5%9F%BA%E4%BA%8EopenCV%E7%9A%84%E7%9B%B8%E6%9C%BA%E6%A0%A1%E6%AD%A3%E7%A8%8B%E5%BA%8F/) for calibration. 
