Can i know how can i remove the white pixels (noises) from the image?
I've tried using the medfilter but the result I obtained is just a pure plain picture.
Thank you.
MATLAB: How can i remove the noises (white pixels) in the image
image processing
Related Solutions
In this case, you should pick up the region, that has maximum diameter, from the output of regionprops function. Based on your original code, I have slightly modified to do that.
I = imread('8122bCXHqPL._SY463_.jpg');Igray = rgb2gray(I);BW = imbinarize(Igray); % Measure the outer radius
BWout = ~BW; BWout = imfill(BWout,'holes');statOuter = struct2table(regionprops(BWout,{'MajorAxisLength','Centroid'}));[~,idxOuter] = max(statOuter.MajorAxisLength);outerRadius = statOuter.MajorAxisLength(idxOuter)/2; % Measure the inner radius
BWin = imclearborder(BW); BWin = imopen(BWin, strel('disk',5)); statInner = struct2table(regionprops(BWin,{'MajorAxisLength','Centroid'}));[~,idxInner] = max(statInner.MajorAxisLength);innerRadius = statInner.MajorAxisLength(idxInner)/2; % Show the result
figureimshow(I) hold on viscircles(statOuter.Centroid(idxOuter,:), outerRadius,'Color','r') viscircles(statInner.Centroid(idxInner,:), innerRadius,'Color','r')
Your image had a white frame/border around it. Use imclearborder() to get rid of that. See corrected code:
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
workspace; % Make sure the workspace panel is showing.
format long g;format compact;fontSize = 20;rgbImage = imread('hole.png');subplot(2,2,1)imshow(rgbImage)title('Original Image', 'FontSize', fontSize);% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off') %binarization
binaryImage = im2bw(rgbImage);% Display this image.
subplot(2,2,2);imshow(binaryImage);title('Original Binary Image', 'FontSize', fontSize);% Important: Get rid of surrounding white border (frame):
binaryImage = imclearborder(binaryImage);% Display this image.subplot(2,2,3);imshow(binaryImage);title('Frame now removed', 'FontSize', fontSize);% Close the holes
filledImage = imfill(binaryImage, 'holes');subplot(2,2,4);imshow(filledImage);title('Image without frame or holes', 'FontSize', fontSize);
Best Answer