Reading images (cv2.imread) in Computer Vision - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read an image from a file using OpenCV.

Computer Vision

import cv2
image = cv2.[1]('photo.jpg')

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Aimshow

Bimread

Cimwrite

Dresize

Attempts:

3 left

💡 Hint

Common Mistakes

Using cv2.imshow instead of cv2.imread to read images.

Using cv2.imwrite which is for saving images.

The cv2.imread function reads an image from a file and loads it into memory.

2fill in blank

medium

Complete the code to read an image in grayscale mode.

Computer Vision

import cv2
image = cv2.imread('photo.jpg', [1])

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Acv2.IMREAD_UNCHANGED

Bcv2.IMREAD_COLOR

Ccv2.IMREAD_ANYCOLOR

Dcv2.IMREAD_GRAYSCALE

Attempts:

3 left

💡 Hint

Common Mistakes

Using cv2.IMREAD_COLOR which loads a color image.

Using cv2.IMREAD_UNCHANGED which keeps alpha channel.

Using cv2.IMREAD_GRAYSCALE loads the image as a grayscale (black and white) image.

3fill in blank

hard

Fix the error in the code to correctly read an image file.

Computer Vision

import cv2
img = cv2.imread[1]

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A[0]

B('image.png', 1)

C('image.png', cv2.IMREAD_COLOR)

D('image.png')

Attempts:

3 left

💡 Hint

Common Mistakes

Missing parentheses causing syntax errors.

Passing arguments outside parentheses.

The cv2.imread function requires parentheses around the filename and optional flag. Using cv2.imread('image.png', cv2.IMREAD_COLOR) correctly reads the image in color mode.

4fill in blank

hard

Fill both blanks to read an image and check if it was loaded successfully.

Computer Vision

import cv2
image = cv2.imread('test.jpg', [1])
if image is [2]:
    print('Failed to load image')

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Acv2.IMREAD_COLOR

BNone

Ccv2.IMREAD_GRAYSCALE

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Not checking if the image is None before using it.

Using wrong flag values for reading.

We read the image in color mode with cv2.IMREAD_COLOR. If image is None, it means loading failed.

5fill in blank

hard

Fill all three blanks to read an image, convert it to grayscale, and display it.

Computer Vision

import cv2
image = cv2.imread('pic.jpg', [1])
gray = cv2.[2](image, [3])
cv2.imshow('Gray Image', gray)
cv2.waitKey(0)
cv2.destroyAllWindows()

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Acv2.IMREAD_COLOR

BcvtColor

Ccv2.COLOR_BGR2GRAY

Dcv2.IMREAD_GRAYSCALE

Attempts:

3 left

💡 Hint

Common Mistakes

Reading image directly in grayscale and then converting again.

Using wrong conversion flags.

First, read the image in color mode. Then convert it to grayscale using cv2.cvtColor with the flag cv2.COLOR_BGR2GRAY. Finally, display the grayscale image.