PSGCAS Search: A Journal of Science and Technology Volume : 4 No. : 1, ISSN: 2349 – 5456 46 A Comparative Study about Various Noise Removal Filters and Edge Detection in MATLAB Subhashini. A Department of Computer science, PSG College of Arts & Science, Coimbatore, Tamil Nadu, India *Corresponding Author: [email protected]ABSTRACT MATLAB (Matrix laboratory) is used to perform various digital image processing functions in an image. In this paper, MATLAB is used for implementation of various filters and edge commands. It is also used to calculate elapsed time of various filter and edge commands in MATLAB. Some of the implemented filters are speckles, pepper and noise, Gaussian filters etc. Aim of this paper is to include various filters with its coding for output comparisons. At the same time, we can include noise to the images. Finally, comparison of time taken for each command will be calculated and compared. Keywords: MATLAB, filters, edge commands, Edge detection INTRODUCTION Digital image processing is used to perform operations on a digital image 1 . It is used for classification, feature extraction, pattern recognition etc. METHODOLOGY In this work, 3 steps are included for converting RGB image to gray image and converting actual image to blurred image etc as step-1. a. Methods Used 1. Conversion of RGB to gray 2. Actual image to blurred image Basically there are three types of noises available in digital image processing. To include noise into a picture, we have used Gaussian, salt and pepper and speckle noise to the image with its coding 2 . Then to remove these noises from the image, we have included filters as step-2. b. Filters used • Motion blurred filters • Median • Wiener • Gaussian • Average • Log • Unsharp c. Edge commands used • Prewitt Edge • Sobel edge d. Edge detection Several methods are used for edge detection in an image. Some of the methods used here are (Step 3): • Canny edge • Roberts edge Methods with Codings img=imread('e:\images\flower\flowers- 46.jpg'); i=rgb2gray(img); figure,imshow(img); title ('Actual image');
6
Embed
A Comparative Study about Various Noise Removal Filters ... › journals › search › issues › Volume-IV-Issu… · A Comparative Study about Various Noise Removal Filters and
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
PSGCAS Search: A Journal of Science and Technology Volume : 4 No. : 1, ISSN: 2349 – 5456 46
A Comparative Study about Various Noise Removal Filters and Edge
Detection in MATLAB
Subhashini. A
Department of Computer science, PSG College of Arts & Science, Coimbatore, Tamil Nadu,