Python | Denoising of colored images using opencv (original) (raw)

Last Updated : 04 Jan, 2023

Denoising of an image refers to the process of reconstruction of a signal from noisy images. Denoising is done to remove unwanted noise from image to analyze it in better form. It refers to one of the major pre-processing steps. There are four functions in opencv which is used for denoising of different images.

Syntax: cv2.fastNlMeansDenoisingColored( P1, P2, float P3, float P4, int P5, int P6)

Parameters:
P1 – Source Image Array
P2 – Destination Image Array
P3 – Size in pixels of the template patch that is used to compute weights.
P4 – Size in pixels of the window that is used to compute a weighted average for the given pixel.
P5 – Parameter regulating filter strength for luminance component.
P6 – Same as above but for color components // Not used in a grayscale image.

Below is the implementation:

import numpy as np

import cv2

from matplotlib import pyplot as plt

img = cv2.imread( 'bear.png' )

dst = cv2.fastNlMeansDenoisingColored(img, None , 10 , 10 , 7 , 15 )

plt.subplot( 121 ), plt.imshow(img)

plt.subplot( 122 ), plt.imshow(dst)

plt.show()

Output:

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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 5 min read

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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 co 3 min read

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 4 min read

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 1 min read

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 4 min read

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 4 min read

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 6 min read

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 5 min read

Webcam QR code scanner using OpenCV In this article, we're going to see how to perform QR code scanning using a webcam.Â 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 take the Qr code picture 3 min read

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 3 min read

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, 5 min read

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 2 min read