❌

Reading view

There are new articles available, click to refresh the page.

open-cv open image

✇Krishna
krishna

What is OpenCV

OpenCV stands for Open Source Computer Vision. It is a library used for computer vision and machine learning tasks. It provides many functions to process images and videos.

Computer Vision

Computer vision is the process of extracting information from images or videos. For example, it can be used for object detection, face recognition, and more.

Source Code

import cv2

image = cv2.imread("./data/openCV_logo.jpg",cv2.IMREAD_COLOR)
image = cv2.resize(image,(600,600))
cv2.imshow("window title",image)

cv2.waitKey(0)

cv2.destroyAllWindows()

Image

OpenCV Functions

imread

This function is used to read an image and returns it as a NumPy array. It requires two arguments:

  1. Image path: The location of the image file.
  2. Read flag: Specifies the mode in which the image should be read. Common flags are:
    • Color Image
    • Grayscale Image
    • Image with Alpha Channel

resize

This function resizes an image. It requires two arguments:

  1. Image array: The NumPy array of the image.
  2. Resolution: A tuple specifying the new width and height.

imshow

This function displays an image. It takes two arguments:

  1. Window name: A string representing the window title.
  2. Image array: The image to be displayed.

waitKey

This function adds a delay to the program and listens for keypress events.

  • If the value is 0, the program waits indefinitely until a key is pressed.
  • If a key is pressed, it releases the program and returns the ASCII value of the pressed key.
  • Example: Pressing q returns 113.

destroyAllWindows

This function closes all open image windows and properly cleans up used resources.

Additional Link

Github code

❌