How do I darken a certain part of the image?
4 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Özge Akbülbül
am 22 Mai 2018
Kommentiert: Rena Berman
am 29 Jun. 2021
Hello
I wanna do darken circle's around .Circle and its inside must stay like the way it is.How can i do that with simple way?Firstly i think about the nested for loops. i and j (row and cloumns) pixel values must be 1 or 0 respectively.Is this idea true?Can someone give me an advice for this?
3 Kommentare
Rik
am 8 Jun. 2021
Unfortunately, the image Stephen added seems to be missing from the Google cache, but the rest of the question is still there:
How do I darken a certain part of the image?
Hello
I wanna do darken circle's around .Circle and its inside must stay like the way it is.How can i do that with simple way?Firstly i think about the nested for loops. i and j (row and cloumns) pixel values must be 1 or 0 respectively.Is this idea true?Can someone give me an advice for this?
Akzeptierte Antwort
Akira Agata
am 24 Mai 2018
One possible solution would be like this:
% Read the file and convert to gray-scale image
I = imread('b.jpg');
Igray = rgb2gray(I);
% Extract the circle by selecting the region with maximum bounding box
BW = imbinarize(Igray);
s = regionprops('table',~BW,'BoundingBox','PixelIdxList');
[~,idx] = max(s.BoundingBox(:,3).*s.BoundingBox(:,4));
% Make the mask image by filling the circle with 'true'
BWmask = false(size(BW));
BWmask(s.PixelIdxList{idx}) = true;
BWmask = imfill(BWmask,'holes');
% Mask the image
Iresult = Igray;
Iresult(~BWmask) = 0;
% Show the reusult
imshowpair(Igray,Iresult,'montage')
0 Kommentare
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Image Processing Toolbox finden Sie in Help Center und File Exchange
Produkte
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!