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Image Resizing using OpenCV | Python

Last Updated :09 Aug, 2024

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Image resizing refers to the scaling of images. Scaling comes in handy in many image processing as well as machine learning applications. It helps in reducing the number of pixels from an image and that has several advantages e.g. It can reduce the time of training of a neural network as the more the number of pixels in an image more is the number of input nodes that in turn increases the complexity of the model.
It also helps in zooming in on images. Many times we need to resize the image i.e. either shrink it or scale it up to meet the size requirements. OpenCV provides us several interpolation methods for resizing an image.

Choice of Interpolation Method for Resizing:

cv2.INTER_AREA: This is used when we need to shrink an image.
cv2.INTER_CUBIC: This is slow but more efficient.
cv2.INTER_LINEAR: This is primarily used when zooming is required. This is the default interpolation technique in OpenCV.

Syntax:cv2.resize(source, dsize, dest, fx, fy, interpolation)

Parameters:

source:Input Image array (Single-channel, 8-bit or floating-point)
dsize: Size of the output array
dest: Output array (Similar to the dimensions and type of Input image array) [optional]
fx: Scale factor along the horizontal axis [optional]
fy:Scale factor along the vertical axis [optional]
interpolation:One of the above interpolation methods [optional]

Below is the code for resizing:

importcv2importmatplotlib.pyplotaspltimage=cv2.imread(r"D:\sims\eb\sim21\EB-ML-06-10-2022-Test-Output-15\PERFORATION\Overkill\Fail\Blister 1 2022-03-12 12-59-43.859 T0 M0 G0 3 PERFORATION Mono.bmp",1)# Loading the imagehalf=cv2.resize(image,(0,0),fx=0.1,fy=0.1)bigger=cv2.resize(image,(1050,1610))stretch_near=cv2.resize(image,(780,540),interpolation=cv2.INTER_LINEAR)Titles=["Original","Half","Bigger","Interpolation Nearest"]images=[image,half,bigger,stretch_near]count=4foriinrange(count):plt.subplot(2,2,i+1)plt.title(Titles[i])plt.imshow(images[i])plt.show()

Output:

Note:One thing to keep in mind while using the cv2.resize() function is that the tuple passed for determining the size of the new image ((1050, 1610) in this case) follows the order (width, height) unlike as expected (height, width).

Image Resizing using OpenCV in Python

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In this article, we will discuss how to animate an image using python's OpenCV module. Let's suppose we have one image. Using that single image we will animate it in such a way it will appear continuous array of the same image. This is useful in animating the background in certain games. For example

Drawing a cross on an image with OpenCV

In this article, we are going to discuss how to draw a cross on an image using OpenCV-Python. We can draw an overlay of two lines one above another to make a cross on an image. Â To draw a line on OpenCV, the below function is used. Syntax: cv2.line(image, starting Point, ending Point, color, thickn

Blur and anonymize faces with OpenCV and Python

In this article, we are going to see how to Blur and anonymize faces with OpenCV and Python. For this, we will be using Cascade Classifier to detect the faces. Make sure to download the same, from this link: haarcascade_frontalface_default.xml ApproachFirstly, we use a built face detection algorithm

Face Detection using Cascade Classifier using OpenCV - Python

Face detection is a important task in computer vision and Haar Cascade classifiers play an important role in making this process fast and efficient. Haar Cascades are used for detecting faces and other objects by training a classifier on positive and negative images.Positive Images: These images con

Real time object color detection using OpenCV

In this article, we will discuss how to detect a monochromatic colour object using python and OpenCV. Monochromatic color means light of a single wavelength. We will use the video, captured using a webcam as input and try to detect objects of a single color, especially Blue. But you can detect any c

Python - Writing to video with OpenCV

In this article, we will discuss how to write to a video using OpenCV in Python. ApproachImport the required libraries into the working space.Read the video on which you have to write. Syntax: cap = cv2.VideoCapture("path")Create a output file using cv2.VideoWriter_fourcc() method Syntax: output = c

Add image to a live camera feed using OpenCV-Python

In this article, we are going to learn how to insert an image in your live camera feed using OpenCV in Python. Stepwise ImplementationStep 1: Importing the libraries CV reads and stores all the images as a NumPy array. We need the NumPy library to manipulate the image and as expected we need the cv2

Face and Hand Landmarks Detection using Python - Mediapipe, OpenCV

In this article, we will use mediapipe python library to detect face and hand landmarks. We will be using a Holistic model from mediapipe solutions to detect all the face and hand landmarks. We will be also seeing how we can access different landmarks of the face and hands which can be used for diff

Emotion Based Music Player - Python Project

In this article, we will be discussing how can we recommend music based on expressions or say dominant expressions on someone's face. This is a basic project in which we will be using OpenCV, Matplotlib, DeepFace, and Spotify API. Import Packages and ModulesOpenCV: OpenCV is a Python open-source pac

Realtime Distance Estimation Using OpenCV - Python

Prerequisite: Introduction to OpenCV In this article, we are going to see how to calculate the distance with a webcam using OpenCV in Python. By using it, one can process images and videos to identify objects, faces, or even the handwriting of a human. This article focuses on detecting objects. We w

Webcam QR code scanner using OpenCV

In this article, we're going to see how to perform QR code scanning using a webcam.Â Webcam QR CODE Scanner Before starting, You need to know how this process is going to work. Firstly you need to open your webcam, and you've to run your python program to make it ready to scan the QR code. You can t

Color Identification in Images using Python - OpenCV

An open-source library in Python, OpenCV is basically used for image and video processing. Not only supported by any system, such as Windows, Linux, Mac, etc. but also it can be run in any programming language like Python, C++, Java, etc. OpenCV also allows you to identify color in images. Donâ€™t you

Real-Time Edge Detection using OpenCV in Python | Canny edge detection method

Edge detection is one of the fundamental image-processing tasks used in various Computer Vision tasks to identify the boundary or sharp changes in the pixel intensity. It plays a crucial role in object detection, image segmentation and feature extraction from the image. In Real-time edge detection,

Opencv Python program for Face Detection

The objective of the program given is to detect object of interest(face) in real time and to keep tracking of the same object.This is a simple example of how to detect face in Python. You can try to use training samples of any other object of your choice to be detected by training the classifier on

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