diff --git a/tools/toCOCO.py b/tools/toCOCO.py
index cc2257d..1694c75 100644
--- a/tools/toCOCO.py
+++ b/tools/toCOCO.py
@@ -263,7 +263,10 @@ class COCOConverter:
                     for obj in objects:
                         object = {}
                         object['category'] = obj.get('category', '')
-                        object['group'] = groups_dict.get(obj.get('group', 0))
+                        if 'background' in object['category']:
+                            object['group'] = 0
+                        else:
+                            object['group'] = groups_dict.get(obj.get('group', 0))
                         object['segmentation'] = obj.get('segmentation', [])
                         object['area'] = obj.get('area', None)
                         object['layer'] = obj.get('layer', None)
diff --git a/ui/COCO_to_ISAT_dialog.py b/ui/COCO_to_ISAT_dialog.py
index b574486..09d9834 100644
--- a/ui/COCO_to_ISAT_dialog.py
+++ b/ui/COCO_to_ISAT_dialog.py
@@ -15,7 +15,7 @@ class Ui_Dialog(object):
     def setupUi(self, Dialog):
         Dialog.setObjectName("Dialog")
         Dialog.setWindowModality(QtCore.Qt.NonModal)
-        Dialog.resize(514, 202)
+        Dialog.resize(600, 166)
         font = QtGui.QFont()
         font.setFamily("Times New Roman")
         font.setPointSize(12)
@@ -49,6 +49,7 @@ class Ui_Dialog(object):
         self.widget_3 = QtWidgets.QWidget(Dialog)
         self.widget_3.setObjectName("widget_3")
         self.horizontalLayout_2 = QtWidgets.QHBoxLayout(self.widget_3)
+        self.horizontalLayout_2.setContentsMargins(0, 0, 0, 0)
         self.horizontalLayout_2.setObjectName("horizontalLayout_2")
         spacerItem = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
         self.horizontalLayout_2.addItem(spacerItem)
@@ -59,6 +60,7 @@ class Ui_Dialog(object):
         self.widget_4 = QtWidgets.QWidget(Dialog)
         self.widget_4.setObjectName("widget_4")
         self.horizontalLayout_3 = QtWidgets.QHBoxLayout(self.widget_4)
+        self.horizontalLayout_3.setContentsMargins(0, 0, 0, 0)
         self.horizontalLayout_3.setObjectName("horizontalLayout_3")
         spacerItem1 = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
         self.horizontalLayout_3.addItem(spacerItem1)
@@ -97,13 +99,13 @@ class Ui_Dialog(object):
 
     def retranslateUi(self, Dialog):
         _translate = QtCore.QCoreApplication.translate
-        Dialog.setWindowTitle(_translate("Dialog", "ISAT to VOC png"))
+        Dialog.setWindowTitle(_translate("Dialog", "COCO to ISAT"))
         self.pushButton_save_root.setText(_translate("Dialog", "Save root"))
         self.pushButton_label_path.setText(_translate("Dialog", "Json path"))
         self.lineEdit_save_root.setPlaceholderText(_translate("Dialog", "ISAT jsons save root"))
         self.lineEdit_label_path.setPlaceholderText(_translate("Dialog", "COCO json path"))
         self.checkBox_keepcrowd.setText(_translate("Dialog", "Keep crowd"))
-        self.label.setText(_translate("Dialog", "Convert COCO json to ISAT jsons."))
+        self.label.setText(_translate("Dialog", "Convert COCO json to ISAT jsons.All layer attr is 1."))
         self.pushButton_cache.setText(_translate("Dialog", "cache"))
         self.pushButton_apply.setText(_translate("Dialog", "convert"))
 import icons_rc
diff --git a/ui/COCO_to_ISAT_dialog.ui b/ui/COCO_to_ISAT_dialog.ui
index 557a10b..f10b015 100644
--- a/ui/COCO_to_ISAT_dialog.ui
+++ b/ui/COCO_to_ISAT_dialog.ui
@@ -9,8 +9,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>514</width>
-    <height>202</height>
+    <width>600</width>
+    <height>166</height>
    </rect>
   </property>
   <property name="font">
@@ -20,7 +20,7 @@
    </font>
   </property>
   <property name="windowTitle">
-   <string>ISAT to VOC png</string>
+   <string>COCO to ISAT</string>
   </property>
   <property name="sizeGripEnabled">
    <bool>false</bool>
@@ -90,6 +90,18 @@
    <item>
     <widget class="QWidget" name="widget_3" native="true">
      <layout class="QHBoxLayout" name="horizontalLayout_2">
+      <property name="leftMargin">
+       <number>0</number>
+      </property>
+      <property name="topMargin">
+       <number>0</number>
+      </property>
+      <property name="rightMargin">
+       <number>0</number>
+      </property>
+      <property name="bottomMargin">
+       <number>0</number>
+      </property>
       <item>
        <spacer name="horizontalSpacer_2">
         <property name="orientation">
@@ -116,6 +128,18 @@
    <item>
     <widget class="QWidget" name="widget_4" native="true">
      <layout class="QHBoxLayout" name="horizontalLayout_3">
+      <property name="leftMargin">
+       <number>0</number>
+      </property>
+      <property name="topMargin">
+       <number>0</number>
+      </property>
+      <property name="rightMargin">
+       <number>0</number>
+      </property>
+      <property name="bottomMargin">
+       <number>0</number>
+      </property>
       <item>
        <spacer name="horizontalSpacer_3">
         <property name="orientation">
@@ -160,7 +184,7 @@
          <string notr="true">color: rgb(255, 0, 0);</string>
         </property>
         <property name="text">
-         <string>Convert COCO json to ISAT jsons.</string>
+         <string>Convert COCO json to ISAT jsons.All layer attr is 1.</string>
         </property>
        </widget>
       </item>
diff --git a/ui/ISAT_to_COCO_dialog.py b/ui/ISAT_to_COCO_dialog.py
index a171bfc..45a5c0e 100644
--- a/ui/ISAT_to_COCO_dialog.py
+++ b/ui/ISAT_to_COCO_dialog.py
@@ -15,7 +15,7 @@ class Ui_Dialog(object):
     def setupUi(self, Dialog):
         Dialog.setObjectName("Dialog")
         Dialog.setWindowModality(QtCore.Qt.NonModal)
-        Dialog.resize(508, 155)
+        Dialog.resize(600, 137)
         font = QtGui.QFont()
         font.setFamily("Times New Roman")
         font.setPointSize(12)
@@ -49,6 +49,7 @@ class Ui_Dialog(object):
         self.widget_3 = QtWidgets.QWidget(Dialog)
         self.widget_3.setObjectName("widget_3")
         self.horizontalLayout_2 = QtWidgets.QHBoxLayout(self.widget_3)
+        self.horizontalLayout_2.setContentsMargins(0, 0, 0, 0)
         self.horizontalLayout_2.setObjectName("horizontalLayout_2")
         spacerItem = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
         self.horizontalLayout_2.addItem(spacerItem)
@@ -87,12 +88,12 @@ class Ui_Dialog(object):
 
     def retranslateUi(self, Dialog):
         _translate = QtCore.QCoreApplication.translate
-        Dialog.setWindowTitle(_translate("Dialog", "ISAT to VOC png"))
+        Dialog.setWindowTitle(_translate("Dialog", "ISAT to COCO"))
         self.pushButton_save_path.setText(_translate("Dialog", "Save path"))
         self.pushButton_label_root.setText(_translate("Dialog", "Jsons root"))
         self.lineEdit_save_path.setPlaceholderText(_translate("Dialog", "COCO json save path"))
         self.lineEdit_label_root.setPlaceholderText(_translate("Dialog", "ISAT jsons root"))
-        self.label.setText(_translate("Dialog", "Convert ISAT jsons to COCO json."))
+        self.label.setText(_translate("Dialog", "Convert ISAT jsons to COCO json.The layer attr will be lost."))
         self.pushButton_cache.setText(_translate("Dialog", "cache"))
         self.pushButton_apply.setText(_translate("Dialog", "convert"))
 import icons_rc
diff --git a/ui/ISAT_to_COCO_dialog.ui b/ui/ISAT_to_COCO_dialog.ui
index f1acc8c..ac58848 100644
--- a/ui/ISAT_to_COCO_dialog.ui
+++ b/ui/ISAT_to_COCO_dialog.ui
@@ -9,8 +9,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>508</width>
-    <height>155</height>
+    <width>600</width>
+    <height>137</height>
    </rect>
   </property>
   <property name="font">
@@ -20,7 +20,7 @@
    </font>
   </property>
   <property name="windowTitle">
-   <string>ISAT to VOC png</string>
+   <string>ISAT to COCO</string>
   </property>
   <property name="sizeGripEnabled">
    <bool>false</bool>
@@ -90,6 +90,18 @@
    <item>
     <widget class="QWidget" name="widget_3" native="true">
      <layout class="QHBoxLayout" name="horizontalLayout_2">
+      <property name="leftMargin">
+       <number>0</number>
+      </property>
+      <property name="topMargin">
+       <number>0</number>
+      </property>
+      <property name="rightMargin">
+       <number>0</number>
+      </property>
+      <property name="bottomMargin">
+       <number>0</number>
+      </property>
       <item>
        <spacer name="horizontalSpacer_2">
         <property name="orientation">
@@ -134,7 +146,7 @@
          <string notr="true">color: rgb(255, 0, 0);</string>
         </property>
         <property name="text">
-         <string>Convert ISAT jsons to COCO json.</string>
+         <string>Convert ISAT jsons to COCO json.The layer attr will be lost.</string>
         </property>
        </widget>
       </item>
diff --git a/ui/ISAT_to_VOC_dialog.py b/ui/ISAT_to_VOC_dialog.py
index 9bddc07..a4c0bd8 100644
--- a/ui/ISAT_to_VOC_dialog.py
+++ b/ui/ISAT_to_VOC_dialog.py
@@ -15,7 +15,7 @@ class Ui_Dialog(object):
     def setupUi(self, Dialog):
         Dialog.setObjectName("Dialog")
         Dialog.setWindowModality(QtCore.Qt.NonModal)
-        Dialog.resize(509, 175)
+        Dialog.resize(600, 173)
         font = QtGui.QFont()
         font.setFamily("Times New Roman")
         font.setPointSize(12)
diff --git a/ui/ISAT_to_VOC_dialog.ui b/ui/ISAT_to_VOC_dialog.ui
index 2225c89..2dbe24e 100644
--- a/ui/ISAT_to_VOC_dialog.ui
+++ b/ui/ISAT_to_VOC_dialog.ui
@@ -9,8 +9,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>509</width>
-    <height>175</height>
+    <width>600</width>
+    <height>173</height>
    </rect>
   </property>
   <property name="font">