Writing/saving images in Computer Vision - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to save an image using OpenCV.

Computer Vision

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

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

Aresize

Bimshow

Cimwrite

Dimread

Attempts:

3 left

💡 Hint

Common Mistakes

Using cv2.imshow instead of cv2.imwrite.

Trying to read the image again instead of saving.

The cv2.imwrite function saves an image to a file.

2fill in blank

medium

Complete the code to save a grayscale image using OpenCV.

Computer Vision

import cv2
image = cv2.imread('input.jpg', [1])
cv2.imwrite('gray_output.jpg', image)

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Acv2.IMREAD_UNCHANGED

Bcv2.IMREAD_GRAYSCALE

Ccv2.IMREAD_COLOR

Dcv2.COLOR_BGR2GRAY

Attempts:

3 left

💡 Hint

Common Mistakes

Using color conversion codes instead of read flags.

Using IMREAD_COLOR which reads a color image.

To read an image in grayscale, use cv2.IMREAD_GRAYSCALE as the flag.

3fill in blank

hard

Fix the error in saving an image with compression parameters.

Computer Vision

import cv2
image = cv2.imread('input.jpg')
cv2.imwrite('compressed.jpg', image, [1])

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A[cv2.IMWRITE_JPEG_QUALITY, 90]

Bcv2.IMWRITE_JPEG_QUALITY=90

C{cv2.IMWRITE_JPEG_QUALITY: 90}

D(cv2.IMWRITE_JPEG_QUALITY, 90)

Attempts:

3 left

💡 Hint

Common Mistakes

Passing parameters as a dictionary or tuple.

Using assignment syntax inside the function call.

The compression parameters must be passed as a list of pairs: [flag, value].

4fill in blank

hard

Fill both blanks to save a PNG image with compression level 3.

Computer Vision

import cv2
image = cv2.imread('input.png')
cv2.imwrite('output.png', image, [[1], [2]])

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Acv2.IMWRITE_PNG_COMPRESSION

Bcv2.IMWRITE_JPEG_QUALITY

C3

D90

Attempts:

3 left

💡 Hint

Common Mistakes

Using JPEG flags for PNG images.

Passing quality value instead of compression level.

Use cv2.IMWRITE_PNG_COMPRESSION flag with compression level 3 for PNG images.

5fill in blank

hard

Fill all three blanks to save a JPEG image with quality 85 and grayscale read.

Computer Vision

import cv2
image = cv2.imread('input.jpg', [1])
cv2.imwrite('output.jpg', image, [[2], [3]])

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

Acv2.IMREAD_GRAYSCALE

Bcv2.IMWRITE_JPEG_QUALITY

C85

Dcv2.IMREAD_COLOR

Attempts:

3 left

💡 Hint

Common Mistakes

Using color read flag instead of grayscale.

Mixing PNG compression flags with JPEG quality.

Read the image in grayscale with cv2.IMREAD_GRAYSCALE, then save with JPEG quality 85 using cv2.IMWRITE_JPEG_QUALITY flag and value 85.