Bounding box representation in Computer Vision - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a bounding box represented by its top-left corner and width and height.

Computer Vision

bbox = {'x': 50, 'y': 100, 'width': 200, 'height': [1]

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A100

B250

C50

D150

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing width with height.

Using the x or y coordinate instead of height.

The height of the bounding box is 150 pixels, so we fill in the height value as 150.

2fill in blank

medium

Complete the code to calculate the bottom-right corner coordinates of the bounding box.

Computer Vision

bottom_right_x = bbox['x'] + [1]
bottom_right_y = bbox['y'] + bbox['height']

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Abbox['x']

Bbbox['height']

Cbbox['width']

Dbbox['y']

Attempts:

3 left

💡 Hint

Common Mistakes

Adding height instead of width to x.

Adding y coordinate instead of width.

The bottom-right x coordinate is the top-left x plus the width of the bounding box.

3fill in blank

hard

Fix the error in the code to correctly compute the bounding box area.

Computer Vision

area = bbox['width'] [1] bbox['height']

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A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Adding width and height instead of multiplying.

Dividing width by height.

The area of a rectangle is width multiplied by height.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps each bounding box id to its area.

Computer Vision

areas = {box_id: bbox[1] bbox[2] for box_id, bbox in boxes.items()}

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A['width'] *

B['height']

C['width'] +

D['height'] *

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition instead of multiplication.

Mixing up width and height keys.

We multiply the width and height values from each bounding box to get the area.

5fill in blank

hard

Fill all three blanks to create a function that converts bounding box from (x, y, width, height) to (x_min, y_min, x_max, y_max).

Computer Vision

def convert_bbox(bbox):
    x_min = bbox['x']
    y_min = bbox['y']
    x_max = bbox['x'] [1] bbox['width']
    y_max = bbox['y'] [2] bbox[[3]]
    return (x_min, y_min, x_max, y_max)

Drag options to blanks, or click blank then click option'

A+

B-

C'height'

D'width'

Attempts:

3 left

💡 Hint

Common Mistakes

Subtracting width or height instead of adding.

Using wrong keys for width or height.

To get x_max and y_max, add width to x and height to y respectively.