Why OCR digitizes text from images in Computer Vision - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to load an image for OCR processing.

Computer Vision

image = cv2.imread([1])

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A'text_image.png'

B12345

CTrue

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number instead of a filename string

Passing None instead of a filename

The cv2.imread function loads an image file given its filename as a string.

2fill in blank

medium

Complete the code to convert the image to grayscale before OCR.

Computer Vision

gray_image = cv2.cvtColor(image, [1])

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Acv2.COLOR_BGR2RGB

Bcv2.COLOR_RGB2BGR

Ccv2.COLOR_GRAY2BGR

Dcv2.COLOR_BGR2GRAY

Attempts:

3 left

💡 Hint

Common Mistakes

Using color conversions that do not produce grayscale images

Converting to grayscale uses cv2.COLOR_BGR2GRAY to simplify the image for OCR.

3fill in blank

hard

Fix the error in the OCR text extraction line.

Computer Vision

text = pytesseract.image_to_string([1])

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Agray_image

Bimage

Ccv2

Dpytesseract

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the original image instead of the grayscale

Passing the module name instead of an image

The OCR function should process the grayscale image, not the original color image or modules.

4fill in blank

hard

Fill both blanks to create a dictionary with word lengths greater than 3.

Computer Vision

word_lengths = {word: [1] for word in text.split() if len(word) [2] 3}

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Alen(word)

B>

C<

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong comparison operator

Storing the word instead of its length

This dictionary comprehension stores the length of each word only if the word length is greater than 3.

5fill in blank

hard

Fill all three blanks to filter words starting with 'a' and count them.

Computer Vision

filtered_words = [word[1] for word in text.split() if word[2]'a')]
count = [3](filtered_words)

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A.lower()

B.startswith(

Clen

D.endswith(

Attempts:

3 left

💡 Hint

Common Mistakes

Using endswith instead of startswith

Not converting to lowercase

Not counting the filtered list

This code filters words starting with 'a' (case-insensitive) and counts them using len().