What is open CV
OPEN CV is stand on (open source computer vision library).open cv generally used in open source library for computer.it provide a comprehensive set of function and tools for various task
How to install openCV using pip
Installing OpenCV using pip is a straightforward process. Here are the steps:
Installing OpenCV using pip
Method 1: Install OpenCV using pip
1. Open a terminal or command prompt: On Windows, you can use the Command Prompt or PowerShell. On macOS or Linux, you can use Terminal.
2. Update pip: Run the following command to update pip to the latest version
How to read using openCV
Some step-by-step guide to read an image using open cv:
-Installing openCV: before you can use open CV. You need to install on it you can install openCV using pip.
Code for read an image using openCV
import cv2
# Read the image
image = cv2.imread(‘image.jpg’)
# Check if the image was read successfully
if image is None:
print(“Error reading image”)
else:
# Print the image shape print(“Image shape:”, image.shape)
# Print the image size print(“Image size:”, image.size)
# Print the image data type
print(“Image data type:”, image.dtype
How display an image using open cv
Displaying images and videos using OpenCV is a straightforward process. Here are the steps:
Displaying Images
1. Read the image: Use the cv2.imread() function to read the image file.
2. Display the image: Use the cv2.imshow() function to display the image.
3. Wait for a key press: Use the cv2.waitKey() function to wait for a key press.
4. Close all windows: Use the cv2.destroyAllWindows() function to close all windows
Code for display using OPENCV
Example Code:
import cv2
# Read the image
image = cv2.imread(‘image.jpg’)
# Check if the image was read successfully
if image is None:
print(“Error reading image”)
else:
# Display the image
cv2.imshow(‘Image’, image)
# Wait for a key press
cv2.waitKey(0)
# Close all windows cv2.destroyAllWindows()
Explanation:
import cv2
#Read the image
image = cv2.imread(‘image.jpg’)
# Check if the image was read successfully if image is None:
print(“Error reading image”)
else:
# Display the image
cv2.imshow(‘Image’, image)
# Wait for a key press
cv2.waitKey(0)
# Close all windows cv2.destroyAllWindows()
How to save image using open cv
-To save an image using OpenCV, you can use the imwrite() function. Here’s a step-by-step guide:
Step 1: Import OpenCV
First, import the OpenCV library:
import cv2
Step 2: Read or Create the Image
Read an existing image or create a new one using OpenCV functions. For example, you can read an image using imread():
image = cv2.imread(‘input.jpg’)
Step 3: Save the Image
Use the imwrite() function to save the image:
cv2.imwrite(‘output.jpg’, image)
In this example, the image is saved as a JPEG file named output.jpg.