update readme with dc2

README.md

@@ -17,20 +17,30 @@ This operator can filter tiny detected segments with format of list of `[start_s
 
 
 ```python
-import towhee
-towhee.dc['pred']([[[0, 0, 100, 100], [0, 0, 10, 10], [0, 0, 60, 10]]]) \
-      .video_copy_detection.filter_tiny_segments['pred', 'filtered_pred'](filter_s_thresh=20) \
-      .show()
+from towhee.dc2 import pipe, ops, DataCollection
+
+p = (
+    pipe.input('pred') \
+        .map('pred', 'filtered_pred', ops.video_copy_detection.filter_tiny_segments(filter_s_thresh=20)) \
+        .output('pred', 'filtered_pred')
+)
+
+DataCollection(p([[0, 0, 100, 100], [0, 0, 10, 10], [0, 0, 60, 10]])).show()
 ```
 
 ![](result.png)
 
 
 ```python
-import towhee
-towhee.dc['pred', 'sim_hw']([[[[0, 0, 10, 10]], [11, 11]]]) \
-      .video_copy_detection.filter_tiny_segments[('pred', 'sim_hw'), 'filtered_pred'](filter_s_thresh=20) \
-      .show()
+from towhee.dc2 import pipe, ops, DataCollection
+
+p = (
+    pipe.input('pred', 'sim_hw') \
+        .map(('pred', 'sim_hw'), 'filtered_pred', ops.video_copy_detection.filter_tiny_segments(filter_s_thresh=20)) \
+        .output('pred', 'sim_hw', 'filtered_pred')
+)
+
+DataCollection(p([[0, 0, 10, 10]], [11, 11])).show()
 ```
 ![](result2.png)