Line following with camera in Drone Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to capture an image from the drone's camera.

Drone Programming

image = drone.camera.[1]()

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

Astart

Bcapture

Cmove

Dfly

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'fly' or 'move' which are for drone movement, not camera capture.

Using 'start' which might start the camera but doesn't capture an image.

The capture() method takes a photo from the drone's camera.

2fill in blank

medium

Complete the code to convert the captured image to grayscale.

Drone Programming

gray_image = drone.camera.[1](image)

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

Agrayscale

Bblur

Ccolorize

Dresize

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'colorize' which adds color instead of removing it.

Using 'blur' which softens the image but doesn't convert to grayscale.

The grayscale() method converts the image to shades of gray, which helps in line detection.

3fill in blank

hard

Fix the error in the code to detect edges in the grayscale image.

Drone Programming

edges = drone.camera.[1](gray_image)

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

Adetect_edges

Bcapture

Cblur

Dresize

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'blur' which smooths the image but doesn't detect edges.

Using 'resize' which changes image size but not edges.

The detect_edges() method finds the edges in the grayscale image, which is essential for line following.

4fill in blank

hard

Fill both blanks to create a dictionary of line positions and their lengths from detected edges.

Drone Programming

line_data = {pos: [1] for pos in edges if edges[pos] [2] 0}

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

Aedges[pos]

B==

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' which only includes edges exactly zero length.

Using '<' which includes edges less than zero, which is invalid.

The dictionary comprehension uses edges[pos] as the value and filters positions where edge length is greater than zero.

5fill in blank

hard

Fill all three blanks to control the drone's movement based on line position and length.

Drone Programming

if line_data.get([1]) [2] [3]:
    drone.move_forward()

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

A'center'

B>

C10

D'left'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'left' instead of 'center' to check line position.

Using '<' instead of '>' which reverses the condition.

The code checks if the line at the center position has length greater than 10, then moves the drone forward.