Improve README

README.md

@@ -30,6 +30,8 @@ The model is trained using a "bipartite matching loss": one compares the predict
 
 DETR can be naturally extended to perform panoptic segmentation, by adding a mask head on top of the decoder outputs.
 
+![model image](https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/transformers/model_doc/detr_architecture.png)
+
 ## Intended uses & limitations
 
 You can use the raw model for panoptic segmentation. See the [model hub](https://huggingface.co/models?search=facebook/detr) to look for all available DETR models.
@@ -39,22 +41,36 @@ You can use the raw model for panoptic segmentation. See the [model hub](https:/
 Here is how to use this model:
 
 ```python
-from transformers import DetrFeatureExtractor, DetrForSegmentation
-from PIL import Image
+import io
 import requests
+from PIL import Image
+import torch
+import numpy
 
-url = 'http://images.cocodataset.org/val2017/000000039769.jpg'
+from transformers import DetrFeatureExtractor, DetrForSegmentation
+from transformers.models.detr.feature_extraction_detr import rgb_to_id
+
+url = "http://images.cocodataset.org/val2017/000000039769.jpg"
 image = Image.open(requests.get(url, stream=True).raw)
 
-feature_extractor = DetrFeatureExtractor.from_pretrained('facebook/detr-resnet-50-panoptic')
-model = DetrForSegmentation.from_pretrained('facebook/detr-resnet-50-panoptic')
+feature_extractor = DetrFeatureExtractor.from_pretrained("facebook/detr-resnet-50-panoptic")
+model = DetrForSegmentation.from_pretrained("facebook/detr-resnet-50-panoptic")
 
+# prepare image for the model
 inputs = feature_extractor(images=image, return_tensors="pt")
+
+# forward pass
 outputs = model(**inputs)
-# model predicts COCO classes, bounding boxes, and masks
-logits = outputs.logits
-bboxes = outputs.pred_boxes
-masks = outputs.pred_masks
+
+# use the `post_process_panoptic` method of `DetrFeatureExtractor` to convert to COCO format
+processed_sizes = torch.as_tensor(inputs["pixel_values"].shape[-2:]).unsqueeze(0)
+result = feature_extractor.post_process_panoptic(outputs, processed_sizes)[0]
+
+# the segmentation is stored in a special-format png
+panoptic_seg = Image.open(io.BytesIO(result["png_string"]))
+panoptic_seg = numpy.array(panoptic_seg, dtype=numpy.uint8)
+# retrieve the ids corresponding to each mask
+panoptic_seg_id = rgb_to_id(panoptic_seg)
 ```
 
 Currently, both the feature extractor and model support PyTorch.