Color spaces (RGB, BGR, grayscale, HSV) in Computer Vision - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to convert an image from BGR to grayscale using OpenCV.

Computer Vision

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

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Acv2.COLOR_BGR2RGB

Bcv2.COLOR_RGB2GRAY

Ccv2.COLOR_GRAY2BGR

Dcv2.COLOR_BGR2GRAY

Attempts:

3 left

💡 Hint

Common Mistakes

Using cv2.COLOR_RGB2GRAY instead of cv2.COLOR_BGR2GRAY

Using a conversion code that changes color order instead of converting to grayscale

OpenCV loads images in BGR format by default. To convert to grayscale, use cv2.COLOR_BGR2GRAY.

2fill in blank

medium

Complete the code to convert an image from RGB to HSV color space.

Computer Vision

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

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Acv2.COLOR_BGR2HSV

Bcv2.COLOR_RGB2HSV

Ccv2.COLOR_HSV2RGB

Dcv2.COLOR_GRAY2HSV

Attempts:

3 left

💡 Hint

Common Mistakes

Using cv2.COLOR_BGR2HSV when the image is RGB

Using a conversion code that converts HSV back to RGB

To convert from RGB to HSV, use cv2.COLOR_RGB2HSV. This changes the color space to HSV.

3fill in blank

hard

Fix the error in the code to convert a grayscale image back to BGR color space.

Computer Vision

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

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Acv2.COLOR_RGB2GRAY

Bcv2.COLOR_BGR2GRAY

Ccv2.COLOR_GRAY2BGR

Dcv2.COLOR_BGR2RGB

Attempts:

3 left

💡 Hint

Common Mistakes

Using cv2.COLOR_BGR2GRAY which converts color to grayscale

Using color order conversions instead of grayscale to BGR

To convert a grayscale image to BGR, use cv2.COLOR_GRAY2BGR. This adds color channels.

4fill in blank

hard

Fill both blanks to create a dictionary that maps color space names to their OpenCV conversion codes.

Computer Vision

color_conversions = {
    'RGB_to_HSV': [1],
    'BGR_to_Gray': [2]
}

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Acv2.COLOR_RGB2HSV

Bcv2.COLOR_BGR2GRAY

Ccv2.COLOR_HSV2RGB

Dcv2.COLOR_GRAY2BGR

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the conversion codes for the keys

Using HSV to RGB instead of RGB to HSV

The dictionary maps 'RGB_to_HSV' to cv2.COLOR_RGB2HSV and 'BGR_to_Gray' to cv2.COLOR_BGR2GRAY.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps each color space name to its conversion code if the code converts to grayscale.

Computer Vision

gray_conversions = {name: code for name, code in color_conversions.items() if code [1] cv2.COLOR_BGR2GRAY or code [2] cv2.COLOR_RGB2GRAY or code [3] cv2.COLOR_HSV2GRAY}

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A==

B!=

Cis

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using != or > instead of ==

Using 'is' which is not reliable for value comparison

The dictionary comprehension filters conversion codes that are exactly equal to grayscale conversion codes using ==.