This repository includes computer vision openCV in python Starting from basics

Import opencv:

import cv2 as cv

1- chap1.py & chap2.py:

Reading and displaying an image in a window and Also resizing a window

• code:
  import cv2 as cv
  #resizing the image
  img = cv.imread("resources/img1.jpeg")
  img1 = cv.resize(img,(400,300))
  cv.imshow("first image", img)
  cv.imshow("first image", img1)
  cv.waitKey(0)
  cv.destroyWindow()*

3- Chap3.py:

Converting image into gray scale

• code:
  gray_img = cv.cvtColor(img, cv.COLOR_BGR2GRAY)*

4- chap4.py:

converting image into black and white image

• code:
  import cv2 as cv
  #resizing the image
  img = cv.imread("resources/img1.jpeg")
  img1 = cv.resize(img,(400,300))
  cv.imshow("first image", img)
  cv.imshow("first image", img1)
  cv.waitKey(0)
  cv.destroyWindow()*

5- chap5.py:

writing an image/ storing and image into a folder

• code:
  import cv2 as cv
  from cv2 import imwrite
  img = cv.imread("resources/img1.jpeg")
  img = cv.resize(img,(400,300))
  gray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
  imwrite('resources/image_gray.png', gray)
  cv.waitKey(0)
  cv.destroyWindow()*

6- chap6.py:

reading video from a folder and display in window

• code:
  import cv2 as cv
  cap = cv.VideoCapture('resources/video.mp4')
  
  
  #indicator(are we reading video or not)
  if (cap.isOpened() == False):
  print("ERROR IN READING VIDEO")
  #reading and playing video
  while(cap.isOpened()):
  ret,frame = cap.read()
  if ret == True:
  cv.imshow("video", frame)
  #quiting form window by pressing 'q'
  if cv.waitKey(1) & 0xFF == ord('q'):
  break
  else:
  break
  cap.release()
  cv.destroyAllWindows()*

7- chap7.py:

Converting video into gray scale

• code:
  import cv2 as cv
  cap = cv.VideoCapture('resources/video.mp4')
  while(True):
  ret, frame = cap.read()
  grayframe = cv.cvtColor(frame, cv.COLOR_BGR2GRAY)
  #(thresh, binary) = cv.threshold(gray, 127, 255, cv.THRESH_BINARY)
  if ret == True:
  cv.imshow("video", grayframe)
  #quiting form window by pressing 'q'
  if cv.waitKey(1) & 0xFF == ord('q'):
  break
  else:
  break
  cap.release()
  cv.destroyAllWindows()*