[Solved] Identify the error in this motion detection code snippet:import cv2 cap = cv2.VideoCapture(0) ret, frame1 = cap.read() ret, frame2 = cap.read() diff = cv2.absdiff(frame1, frame2) gray = cv2.... | Raspberry Pi

Raspberry Pi - Camera Module

Identify the error in this motion detection code snippet:

import cv2
cap = cv2.VideoCapture(0)
ret, frame1 = cap.read()
ret, frame2 = cap.read()
diff = cv2.absdiff(frame1, frame2)
gray = cv2.cvtColor(diff, cv2.COLOR_BGR2GRAY)

ANo error, code is correct

Bcv2.absdiff requires grayscale images, not color

Ccv2.cvtColor should use COLOR_RGB2GRAY instead of COLOR_BGR2GRAY

Dcap.read() should be called only once

Step-by-Step Solution

Solution:

Step 1: Check cv2.absdiff input
It accepts color images and returns a color difference image.
Step 2: cv2.cvtColor usage
Converting BGR to grayscale is standard since OpenCV reads images in BGR format.
Step 3: cap.read() usage
Calling cap.read() twice to get two frames is correct for motion detection.
Final Answer:
No error, code is correct -> Option A
Quick Check:
OpenCV uses BGR by default [OK]

Quick Trick: OpenCV images are BGR by default, so COLOR_BGR2GRAY is correct [OK]

Common Mistakes:

MISTAKES

Assuming OpenCV uses RGB instead of BGR
Thinking absdiff only works on grayscale images
Believing cap.read() should be called once for motion detection

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More Raspberry Pi Quizzes

Identify the error in this motion detection code snippet:

Step 1: Check cv2.absdiff input

Step 2: cv2.cvtColor usage

Step 3: cap.read() usage

Final Answer:

Quick Check:

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