Add 480p description

README.md

@@ -64,7 +64,7 @@ where the main landmark annotation scripts ```makeData_virtual.py``` and ```make
             |--rgb_<FRAME_ID>.jpg
             |--depth_<FRAME_ID>.jpg
 ```
-where ```<SCENE_ID>``` matches exactly the original one in [Gibson](https://github.com/StanfordVL/GibsonEnv/blob/master/gibson/data/README.md) and [Matterport](https://aihabitat.org/datasets/hm3d/) run by the photo-realistic simulator [Habitat](https://github.com/facebookresearch/habitat-sim). Images are saved in either ```.jpg``` or ```.png``` format. Note that ```rgb``` images are the main visual representation while ```depth``` is the auxiliary visual information captured only in the virtual environment.
+where ```<SCENE_ID>``` matches exactly the original one in [Gibson](https://github.com/StanfordVL/GibsonEnv/blob/master/gibson/data/README.md) and [Matterport](https://aihabitat.org/datasets/hm3d/) run by the photo-realistic simulator [Habitat](https://github.com/facebookresearch/habitat-sim). Images are saved in either ```.jpg``` or ```.png``` format. Note that ```rgb``` images are the main visual representation while ```depth``` is the auxiliary visual information captured only in the virtual environment. Real-world RGB images are downsampled to a ```640 × 480``` resolution noted by ```480p``` in a trajectory folder name.
 
 ```worker_graph.json``` stores the meta data in dictionary in Python saved in ```json``` file with the following format: