Image-Acquisition-from-Web-Cameraa

Aim

Aim:

To write a python program using OpenCV to capture the image from the web camera and do the following image manipulations. i) Write the frame as JPG ii) Display the video iii) Display the video by resizing the window iv) Rotate and display the video

Software Used

Anaconda - Python 3.7

Algorithm

Step 1:

Import OpenCV Package

Step 2:

Capture Video from a Webcam. Use VideoCapture(0) to access the webcam and start capturing video.

Step 3:

Read the Video or Image. Utilize 'imread' to read a video frame or image from the webcam

Step 4:

Save Image to File. Employ 'imwrite' to save the captured image to a file.

Step 5:

Display Video or Image. Use 'imshow' to display the captured video frame or image

Step 6:

End the Program with 'q'. Allow the program to be terminated by pressing the 'q' key

Program:

### Developed By: Jeswanth
### Register No:212221230042

i) Write the frame as JPG file

import cv2
videoCaptureObject = cv2.VideoCapture(0)
while (True):
    ret,frame = videoCaptureObject.read()
    cv2.imwrite("Frame.jpeg",frame)
    result = False
videoCaptureObject.release()
cv2.destroyAllWindows()

ii) Display the video

import cv2
videoCaptureObject = cv2.VideoCapture(0)
while(True):
    ret,frame = videoCaptureObject.read()
    cv2.imshow('video',frame)
    if cv2.waitKey(1) == ord('q'):
        break
videoCaptureObject.release()
cv2.destroyAllWindows()

iii) Display the video by resizing the window

import cv2
import numpy as np
cap = cv2.VideoCapture(0)
while True:
    ret, frame = cap.read() 
    width = int(cap.get(3))
    height = int(cap.get(4))
    image = np.zeros(frame.shape, np.uint8) 
    smaller_frame = cv2.resize(frame, (0,0), fx = 0.5, fy=0.5) 
    image[:height//2, :width//2] = smaller_frame
    image[height//2:, :width//2] = smaller_frame
    image[:height//2, width//2:] = smaller_frame 
    image [height//2:, width//2:] = smaller_frame
    cv2.imshow('resize', image)
    if cv2.waitKey(1) == ord('q'):
        break
cap.release()
cv2.destroyAllWindows()

iv) Rotate and display the video

import cv2
import numpy as np
cap = cv2.VideoCapture(0)
while True:
    ret, frame = cap.read() 
    width = int(cap.get(3))
    height = int(cap.get(4))
    image = np.zeros(frame.shape, np.uint8) 
    smaller_frame = cv2.resize(frame, (0,0), fx = 0.5, fy=0.5) 
    image[:height//2, :width//2] = cv2.rotate(smaller_frame,cv2.ROTATE_180)
    image[height//2:, :width//2] = cv2.rotate(smaller_frame,cv2.ROTATE_180)
    image[:height//2, width//2:] = smaller_frame 
    image [height//2:, width//2:] = smaller_frame
    cv2.imshow('rotate', image)
    if cv2.waitKey(1) == ord('q'):
        break
cap.release()
cv2.destroyAllWindows()

Output

i) Write the frame as JPG image

ii) Display the video

iii) Display the video by resizing the window

iv) Rotate and display the video

Result:

Thus the image is accessed from webcamera and displayed using openCV.

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