Step 1
Objects: Red Backpack, Green Bed

Step 2
General Objects: Red Backpack, Green Bed
Text in the Image: N/A
Objects that specifically refer to the Proper Noun of the Real World: N/A

Step 3
triplets: [Red Backpack, General Objects, is on top of, Green Bed, General Objects]

Step 4
(1) Node with max degree: Green Bed. 
(2) Location of Green Bed: [Center of the canvas].
(3) Location of Red Backpack: [Center-top of the Green Bed].

Step 5
Bounding Boxes of the Objects:
Green Bed, General Objects: [0.100, 0.400, 0.900, 0.900] - The bed occupies a large central area of the canvas.
Red Backpack, General Objects: [0.400, 0.300, 0.600, 0.500] - The backpack is placed centrally on top of the bed.

Step 6
{"Green Bed": {"phrase": "Green Bed", "coordinates": [0.100, 0.400, 0.900, 0.900]},
 "Red Backpack": {"phrase": "Red Backpack", "coordinates": [0.400, 0.300, 0.600, 0.500]}}