Why OpenCV is the standard CV library in Computer Vision - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the OpenCV library in Python.

Computer Vision

import [1] as cv

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

Acv2

Bcv

Copencv

Dopencv-python

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'opencv' instead of 'cv2' causes import errors.

Trying to import 'opencv-python' directly is incorrect.

The OpenCV library is imported in Python using 'cv2'.

2fill in blank

medium

Complete the code to read an image file using OpenCV.

Computer Vision

image = cv.[1]('image.jpg')

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Aload

Bimread

Copen

Dread_image

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'load' or 'open' causes attribute errors.

Trying 'read_image' is not a valid OpenCV function.

The function 'imread' reads an image file into OpenCV.

3fill in blank

hard

Fix the error in the code to convert an image to grayscale.

Computer Vision

gray = cv.cvtColor(image, [1])

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Acv.COLOR_BGR2GRAY

Bcv.COLOR_RGB2GRAY

Ccv.COLOR_BGR2RGB

Dcv.COLOR_GRAY2BGR

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'COLOR_RGB2GRAY' causes wrong color conversion.

Using 'COLOR_BGR2RGB' changes color space but not to grayscale.

To convert a BGR image to grayscale, use 'cv.COLOR_BGR2GRAY'.

4fill in blank

hard

Fill both blanks to resize an image to 100x100 pixels.

Computer Vision

resized = cv.resize(image, ([1], [2]))

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A100

B200

C50

D150

Attempts:

3 left

💡 Hint

Common Mistakes

Using different numbers for width and height changes aspect ratio.

Using values other than 100 does not meet the requirement.

The size tuple (100, 100) resizes the image to 100 pixels width and height.

5fill in blank

hard

Fill all three blanks to display an image window and wait for a key press.

Computer Vision

cv.imshow('[1]', [2])
cv.[3](0)
cv.destroyAllWindows()

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

Awindow

Bimage

CwaitKey

Dshow

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'show' instead of 'waitKey' causes errors.

Passing wrong variable names causes runtime errors.

Use 'imshow' to show the image in a window named 'window', pass the image variable, then 'waitKey(0)' waits for a key press.