diff --git a/optimum/exporters/onnx/base.py b/optimum/exporters/onnx/base.py
index 198094cbd2..d93c0b29f6 100644
--- a/optimum/exporters/onnx/base.py
+++ b/optimum/exporters/onnx/base.py
@@ -133,14 +133,7 @@ class OnnxConfig(ExportConfig, ABC):
         "feature-extraction": OrderedDict({"last_hidden_state": {0: "batch_size", 1: "sequence_length"}}),
         "fill-mask": OrderedDict({"logits": {0: "batch_size", 1: "sequence_length"}}),
         "image-classification": OrderedDict({"logits": {0: "batch_size"}}),
-        # TODO: Is this the same thing as semantic-segmentation?
-        "image-segmentation": OrderedDict(
-            {
-                "logits": {0: "batch_size", 1: "num_queries"},
-                "pred_boxes": {0: "batch_size", 1: "num_queries"},
-                "pred_masks": {0: "batch_size", 1: "num_queries"},
-            }
-        ),
+        "image-segmentation": OrderedDict({"logits": {0: "batch_size", 1: "num_labels", 2: "height", 3: "width"}}),
         "image-to-text": OrderedDict({"logits": {0: "batch_size", 1: "sequence_length"}}),
         "mask-generation": OrderedDict({"logits": {0: "batch_size"}}),
         "masked-im": OrderedDict(
diff --git a/optimum/exporters/onnx/model_configs.py b/optimum/exporters/onnx/model_configs.py
index 1d203daa63..20304e6d6c 100644
--- a/optimum/exporters/onnx/model_configs.py
+++ b/optimum/exporters/onnx/model_configs.py
@@ -572,7 +572,7 @@ class ConvNextOnnxConfig(ViTOnnxConfig):
 
 
 class MobileViTOnnxConfig(ViTOnnxConfig):
-    pass
+    ATOL_FOR_VALIDATION = 1e-4
 
 
 class RegNetOnnxConfig(ViTOnnxConfig):
@@ -588,9 +588,14 @@ class DetrOnnxConfig(ViTOnnxConfig):
     DEFAULT_ONNX_OPSET = 12
 
     @property
-    def inputs(self) -> Dict[str, Dict[int, str]]:
-        # TODO: is pixel mask needed?
-        return {**super().inputs, "pixel_mask": {0: "batch_size"}}
+    def outputs(self) -> Dict[str, Dict[int, str]]:
+        if self.task == "image-segmentation":
+            return {
+                "logits": {0: "batch_size", 1: "num_queries"},
+                "pred_masks": {0: "batch_size", 1: "num_queries"},
+            }
+        else:
+            return super().outputs
 
 
 class YolosOnnxConfig(ViTOnnxConfig):
diff --git a/optimum/exporters/tasks.py b/optimum/exporters/tasks.py
index e841a6e047..0b7246034c 100644
--- a/optimum/exporters/tasks.py
+++ b/optimum/exporters/tasks.py
@@ -161,7 +161,7 @@ class TasksManager:
             "object-detection": "AutoModelForObjectDetection",
             "question-answering": "AutoModelForQuestionAnswering",
             "image-classification": "AutoModelForImageClassification",
-            "image-segmentation": "AutoModelForImageSegmentation",
+            "image-segmentation": ("AutoModelForImageSegmentation", "AutoModelForSemanticSegmentation"),
             "mask-generation": "AutoModel",
             "masked-im": "AutoModelForMaskedImageModeling",
             "semantic-segmentation": "AutoModelForSemanticSegmentation",
@@ -632,6 +632,7 @@ class TasksManager:
         "mobilevit": supported_tasks_mapping(
             "feature-extraction",
             "image-classification",
+            "image-segmentation",
             onnx="MobileViTOnnxConfig",
         ),
         "mobilenet-v1": supported_tasks_mapping(
@@ -766,6 +767,7 @@ class TasksManager:
         "segformer": supported_tasks_mapping(
             "feature-extraction",
             "image-classification",
+            "image-segmentation",
             "semantic-segmentation",
             onnx="SegformerOnnxConfig",
         ),