How to draw a white border around an image(or a group of images in a folder)

Question

Kumar Arindam Singh 2017-4-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/333107-how-to-draw-a-white-border-around-an-image-or-a-group-of-images-in-a-folder

编辑： Kumar Arindam Singh 2017-4-4

I have an image :-

Now i want to draw a white border around the image,such that i get this:-

How can i do this.Please help.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2017-4-1

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/333107-how-to-draw-a-white-border-around-an-image-or-a-group-of-images-in-a-folder#answer_261332

在 MATLAB Online 中打开

Use padarray():

padsize = 1;
padvalue = 255; % or 1 if image is single, double, or logical.
paddedImage = padarray(originalImage, padsize, padval);

3 个评论
显示 1更早的评论隐藏 1更早的评论

Image Analyst 2017-4-1

在 MATLAB Online 中打开

Then just write it in yourself

grayImage(:, 1) = 255; % Make left column white.
grayImage(:, end) = 255; % Make right column white.
grayImage(1, :) = 255; % Make top row white.
grayImage(end, :) = 255; % Make  bottom row white.

Kumar Arindam Singh 2017-4-4

编辑：Kumar Arindam Singh 2017-4-4

I have this code: %read image im=imread('2.jpg'); figure,imshow(im); %convert image to grayscale components imr=im(:,:,1); img=im(:,:,2); imb=im(:,:,3);

%write the images to specified folders with a suitable name imwrite(imr, 'C:\Users\hp\Documents\MATLAB\Imageprocessing\project1\001r.jpg','jpg'); imwrite(img, 'C:\Users\hp\Documents\MATLAB\Imageprocessing\project1\001g.jpg','jpg'); imwrite(imb, 'C:\Users\hp\Documents\MATLAB\Imageprocessing\project1\001b.jpg','jpg');

%calculate the level of the blue image using OTSU's threshold function level = graythresh(imb);

%converting the blue component grayscale image to binary image with the %help of level calculated using OTSU's threshold function bwb=im2bw(imb,level);

%show the binary image figure,imshow(bwb);

%save the binary image imwrite(bwb, 'C:\Users\hp\Documents\MATLAB\Imageprocessing\project1\001bin.jpg','jpg'); %tried implementing your code snippet bwb(:,1)=255; bwb(:,end)=255; bwb(1,:)=255; bwb(end,:)=255; figure,imshow(bwb);

There seems to be no effect. I am using MATLAB R2015a

请先登录，再进行评论。