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how can i find pixels of image's border

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bay rem
bay rem 2015-12-28
回答： harjeet singh 2015-12-28
i have a set of images and i would like to test if there is a a black border on limits on the image, such this one:
i will appreciate any help ,thank you ^^

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harjeet singh
harjeet singh 2015-12-28
you may use this code do set the th val according to the boarder noise
clear all
close all
clc
img=imread('images.jpg');
th=10;
a=img(:,:,1)>th & img(:,:,2)>th & img(:,:,3)>th;
a=bwareaopen(a,5000);
[r,c]=find(a==1);
b=img(min(r):max(r),min(c):max(c),:);
figure(1)
imshow(b)

更多回答（1 个）

Image Analyst
Image Analyst 2015-12-28
Your image has white columns on the left and right side - did you know that? So there are no all zero rows. To see if all pixels in a row or column are 0, use all():
allZeroColumns = all(grayImage == 0, 1);
allZeroRows = all(grayImage == 0, 2);
These are logical vectors. If you want, you can then use them to remove all zero rows or columns:
grayImage(:, allZeroColumns) = [];
grayImage(allZeroRows, :) = [];

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